【英语】2018届人教新课标选修6一轮复习：unit4Globalwarming教案设计（33页）

【英语】2018届人教新课标选修6一轮复习：unit4Globalwarming教案设计（33页）

Unit 4 Global warming Ⅰ. 单元教学目标 技能目标Skill Goals ‎▲Talk about global warming, pollution and the importance of protecting the earth ‎▲Practise expressing agreement, disagreement, blame and complaint ‎▲How to use“it” for emphasis in a sentence ‎▲Write an essay on environmental problems Ⅱ. 目标语言 功 ‎ 能 ‎ 句 ‎ 式 Expressing agreement, disagreement, blame and complaint Yes, I agree with you.‎ Yes, I think so.‎ I believe that you’ve got it right.‎ I don’t think so.‎ I don’t think that’s right.‎ I’m afraid you are wrong.‎ I’m sorry to bring this up, but ... ‎ I’m sorry to have to say this, but ...‎ They shouldn’t have done it.‎ They are to blame.‎ Why don’t you do something about it?‎ Perhaps they should / ought to do ...‎ 词 汇 ‎1． 四会词汇 compare, graph, phenomenon, fuel, quantity, per, data, catastrophe, climate, consequence, state, range, glance, widespread, decrease, steady, steadily, average, existence, outer, electrical, motor, can (n.), microwave, nuclear, disagreement, title ‎2． 认读词汇 renewable, greenhouse, Fahrenheit, Sophie, Armstrong, Janice, Foster,‎ ‎ methane, Charles Keeling, measurement, Celsius, famine, destruction, George Hambley, speculation, environmental, hectare, emphasis, individual, appliance, heading, imperative ‎3． 词组 compare to, come about, quantities of, result in, build up, keep on, on the whole, make a difference, put up with, so long as, and so on ‎4. 重点词汇 data, quantity, catastrophe, climate, consequence, compare, per, range, glance, average, existence 语 法 ‎“It” used for emphasis It is human activity that has caused this global warming.‎ 重 点 句 子 ‎1. There is no doubt that the earth is becoming warmer. P26‎ ‎2. Without the‘greenhouse effect’, the earth would be about thirty-three degrees Celsius cooler than it is. P26‎ ‎3. They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. P26‎ ‎4. Together, individuals can make a difference. P30‎ ‎5. It takes a lot of energy to make things from new materials…. P30‎ ‎6. Remember — your contribution counts. P30‎ Ⅲ. 教材分析与教材重组 ‎1. 教材分析 本单元以Global warming 为主线，旨在通过单元教学使学生经过思考、学习，认识到全球变暖的起因和它所带来的种种后果。同时鼓励学生进一步阐述地球所面临的其它严重问题，激发学生的环保意识。引导学生运用所学语言、句式表达自己对这些现象的看法，培养他们为自己的观点辩论的能力，并能运用所学知识写一篇有关环境问题的论文。‎ ‎1.1 Warming ‎ Up通过直观的图片，使学生对能源的用途和种类有一个基本的了解。让学生对当今人们开发和使用能源以及随之而来的种种影响有更深一步的思考和认识，从而为本单元主题Global warming 作了很好的铺垫。‎ ‎1.2 Pre-reading是Reading的热身活动。通过组织学生对这些问题的讨论、回答，激活他们头脑中相关的内容模式，为下一步阅读做好准备。由于Global warming 是当今世界的一个热门话题，学生已从多种渠道对此有了很多的了解，因此教师可以在安排预习作业时让学生分组做 a project on global warming , 这样既符合了新课程的要求——体现学生的主体地位，激发学生自主学习的热情，又能得到很好的教学效果。‎ ‎1.3 Reading是一篇从杂志节选的文章。它讲述了全球加速变暖的原因——人为温室效应，后果以及人们对此的不同观点。要求学生在理解文章大意的同时注意它的写作技巧：提出问题——分析现象——阐述各方面的不同观点——以疑问句作为总结引发读者深思，自行做出判断。这为Comprehending 中Exercise 3的分组辩论活动留出了很大的空间，埋下了很好的伏笔。‎ ‎1.4 Comprehending 包含了三大部分。前两个部分中设计了诸多细节性的问题，旨在检测学生定位、理解细节及对文章大意的总结归纳的能力。最后一项要求学生在读完整篇文章后，仔细思考并树立自己的观点：“We should do nothing about global warming”还是“We should do something to decrease the speed of global warming”，并利用所学知识进行分组辩论。此项活动旨在激发学生的学习热情并体现学生在课堂中的主体位置。‎ ‎1.5 Learning about Language 分词汇和语法两部分。词汇部分设计了两项练习，一项是具有一定情境的10个句子，引导学生加深对新词汇的理解和记忆。语法部分主要是通过练习加强学生对强调句式的掌握并能真正体会强调句的作用。‎ ‎1.6 Using Language 部分设计了包括听、读、写的活动。Reading and writing 是Reading的一个延伸。通过读者和杂志社之间的两封信件，学生可以更多地了解如何控制全球变暖。同时通过课后练习可以让学生更多地联系自己的生活习惯，树立从自身做起倡导环保的观念。其中课后练习make a poster 更是激发了学生自主学习的兴趣，而且很有实用性——可将所做的环保内容的海报贴在校园或社区中，将课堂的抽象知识变为了社会实践，实现了真正意义上的学以致用。Listening and speaking 部分是关于能源使用的一篇电台采访。要求学生在理解大意和主要细节的基础上回答听力练习中的几大问题，提高学生的听力水平。‎ ‎2. 教材重组 ‎2.1 将Warming Up与Listening and speaking 整合在一起，设计为一节听说课。‎ ‎2.2 将Pre-reading, Reading和Comprehending 整合在一起，设计为一节阅读课。‎ ‎2.3 将Using Language中的Reading and writing 设计为一节泛读课。‎ ‎2.4 将Learning about Language 与Workbook 中的USING WORDS AND EXPRESSIONS和USING STRUCTURES 整合在一起，设计为一节语言学习课。‎ ‎2.5 将Workbook 中的LISTENING，TALKING， LISTENING TASK 和SPEAKING TASK 整合在一起，上一节听、说练习课。‎ ‎2.6 将Workbook 中的READING TASK 和WRITING TASK 整合在一起，设计为一节写作课。‎ ‎3. 课型设计与课时分配 ‎1st Period Speaking and Listening ‎ ‎2nd Period Reading ‎ ‎3rd Period Extensive Reading ‎ ‎4th Period Language Study ‎ ‎5th Period Drills ‎ ‎6th Period Writing ‎ ‎ ‎ Ⅳ. 分课时教案 ‎ The First Period Speaking and Listening Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 energy, light (v.), heat (v.), renewable, non-renewable, fuel, blame, run out b. 交际用语 Expressing agreement and disagreement Yes, I agree with you.‎ Yes, I think so.‎ I believe that you’ve got it right.‎ I don’t think so.‎ I don’t think that’s right.‎ I’m afraid you are wrong.‎ ‎2. Ability goals 能力目标 Enable the students to talk about different sources of energy and express their own ideas.‎ ‎3. Learning ability goals 学能目标 Help the students learn how to give their ideas about the use of energy.‎ Teaching important points 教学重点 Enable the students to express agreement and disagreement.‎ Teaching difficult points 教学难点 Enable the students to learn how to express agreement and disagreement.‎ Teaching methods 教学方法 Brainstorming, listening and group work.‎ Teaching aids 教具准备 A tape recorder and a computer.‎ Teaching procedures & ways 教学过程与方式 Step ⅠRevision T: Good morning, everyone.‎ Ss: Good morning, teacher.‎ T: Sit down, please. Before class, I’ll check your homework first. Mary, would you read your homework to us?‎ Check the students’ homework and have a discussion with the students about the mistakes Mary made. Let the students have a clear understanding about the mistakes and then correct them.‎ Step ⅡWarming up T: As we all know, we depend on energy to do many things in our daily life. Some ‎ people even say we could do nothing without energy. Can you tell me what we use energy for?‎ Sa: Energy lights our cities.‎ Sb: Energy heats our buildings.‎ Sc: Energy entertains us. With the help of electricity, people have got a lot of fun from watching TV, playing computers and so on.‎ Sd: There are many other electrical appliances that make our life more convenient and comfortable such as washing machines, microwaves, air conditioners and so on.‎ Se: Today energy also helps people realize many so-called dreams in the past. For example, people can “fly” from one place to another by plane which runs on energy.‎ Sf: It’s true. In fact, not only planes but also cars, ships and trains run on energy.‎ T: Well done. All that you’ve just said is right. So it seems that energy plays a very important role in the modern world. Then where does all the energy come from? Open your books and turn to page 25. Look at the pictures on this page. They may help you find out the answers.‎ After a while.‎ T: Who’d like to tell us your answers?‎ Sg: Wind power.‎ Sh: Coal power.‎ T: Right. Is there any difference between them?‎ Si: Yes. Wind will never run out while coal is a limited source.‎ T: It’s true. As we know, an energy source is renewable when supplies of it never run out while some supplies， such as coal, will definitely run out one day. Energy of this kind is called non-renewable sources. Please think of as many sources as you can and decide which energy sources on your list are renewable and which are non-renewable.‎ If necessary, give some words related to the pictures which might be difficult for the students such as oil refinery, hydroelectric power and so on.‎ The teacher should also collect as much information about different sources of energy as possible and show it to the students in class through a computer. In this way, the ‎ students will become more interested in this topic and their knowledge on this aspect will be enlarged.‎ Sample answers:‎ Renewable Non-renewable Wind power Coal Solar power Natural gas and oil Hydroelectric power Nuclear power Step Ⅲ Listening and Discussing ‎ T: From what we’ve just talked about, it is clear that energy does a lot of good to us. But every coin has two sides. Is there any negative effect of using energy?‎ Sa: Yes. People use too much energy which is resulting in an increase in carbon dioxide. That is how the global warming comes about.‎ Sb: And meanwhile it pollutes the environment.‎ T: It’s true. Many people have realized the problem. Next we’ll do some listening practice on this topic. Let’s see what other people think of this issue. ‎ The students are asked to read the questions quickly to find out the listening points first. Then listen to the tape twice and give the correct answers.‎ T: Now please turn to page 31. Let’s do listening. Before you listen to the tape, please read fast the statements in Exercise 1 to find out the listening points. Pay much attention to the key points while listening.‎ Play the tape for the first time. Help the students get a general understanding about the dialogue. The students listen and try to finish Exercise 1. Play the tape again, train the students’ ability to spot specific information and understand the implication in the dialogue. The students listen and finish Exercise 2.‎ Several minutes later. ‎ T：Have you finished the exercises?‎ Ss: Yes.‎ T: OK, let’s check your answers. ‎ Explain some difficult points if necessary.‎ T: Now read what Professor Chen and Li Bin say. Work in groups. Discuss who you agree with and give reasons. Use some of the phrases listed in Exercise 2 or any others you know.‎ Step Ⅳ Homework ‎1. Review the new words and expressions you learned in this class.‎ ‎2. Preview Reading.‎ The Second Period ‎Reading Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 compare, phenomenon, graph, fuel, trap, data, climate, catastrophe, consequence, range, per, glance, compare to, come about, fierce debate, result in, build up b. 重点句式 There is no doubt that the earth is becoming warmer. P26‎ Without the‘greenhouse effect’, the earth would be about thirty-three degrees Celsius cooler than it is. P26‎ They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. P26‎ ‎2. Ability goals 能力目标 Enable the students to talk about the causes and effects of global warming.‎ ‎3. Learning ability goals 学能目标 Help the students learn how to talk about the causes and effects of global warming and express ideas about what people should do about it.‎ Teaching important points教学重点 Help the students learn how to debate over the topic “We should do nothing about global warming.”‎ Teaching difficult points 教学难点 Enable the students to learn the writing skills of the text and get a better understanding of articles of this kind.‎ Teaching methods 教学方法 Listening, reading and group work.‎ Teaching aids 教具准备 ‎ A recorder and a computer.‎ Teaching procedures & ways 教学过程与方式 Step ⅠRevision Check the homework.‎ Review the useful expressions about agreement and disagreement.‎ Show the students some pictures on the screen. The students have to give names of different energy sources relative to the pictures and deicide which energy sources are renewable and which are not. Then ask the students to tell the effects of using these energy sources.‎ Step Ⅱ Pre-reading Show a picture of greenhouse on the screen.‎ T: Now look at the picture. What is it in the picture?‎ S: A greenhouse.‎ T: Right .Who can tell me what it is used for?‎ Sa: A greenhouse is made of glass and is used for growing plants, especially during cold weather.‎ T: Yes, you are right. And how does it work?‎ Sb: The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.‎ T: Exactly. Thank you. But today we are not going to talk about greenhouse, we’ll talk about greenhouse gases. Have you heard about this before?‎ Sc: I know. In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, including carbon dioxide, methane and water vapor.‎ T: That’s correct. Then what do you think greenhouse gases do?‎ Sd: Let me explain it. They trap heat from the sun and therefore warm the earth.‎ T: Yes. Last class we talked about the effects of burning fossil fuels. One of the effects is more and more carbon dioxide is being produced, which in turn increases the speed of global warming. Does it matter? What’re your opinions? Next we’ll read an article “THE EARTH IS BECOMING WARMER — BUT DOES IT MATTER?”‎ ‎ ‎ Step Ⅲ While-reading Get the students to read the passage fast and meanwhile help the students form a good habit of reading.‎ T: What do you think will be talked about at the sight of the title “THE EARTH IS BECOMING WARMER — BUT DOES IT MATTER?” Now please skim the passage to obtain a general idea of the whole passage. While reading, pay attention to the writing skills and if possible, divide the whole passage into several parts and summarize the main idea for each part.‎ After a few minutes.‎ T: How many parts can this text be divided into?‎ T: Any different ideas? OK. Now let’s finish the form on the screen.‎ Show the form on the screen and let the students complete the form.‎ Main ideas of each part Writing techniques Step Ⅳ Comprehending Let the students read the passage again to find out the answers to the questions in Exercises 1 and 2.‎ T: Now let’s listen to the tape. While listening, pay more attention to specific information. Then read the whole passage by yourselves. Try to find out the answers to questions in Exercises 1 and 2. You may work in groups.‎ Step Ⅴ Debate ‎ Get the students to debate over the statement: We should do nothing about global warming. Let them work in groups of six to prepare it. ‎ T: Now you are going to have a debate: We should do nothing about global warming. Please follow these instructions.‎ Put the following instructions on the screen.‎ ‎● Get into groups of six. Decide which three in your group are going to agree with the statement (Group A) and which three are going to disagree with the statement (Group B).‎ ‎● Group A discuss why they agree with the statement; Group B discuss why they disagree.‎ ‎● Group A and B get together. Tell each other the reasons why agree or disagree with the statement.‎ T: We don’t have time to do it in class. Please finish it after class. Try to collect as much information as possible on the Internet and share it with the others in class. Next class I’ll get some groups to act out your debates. ‎ Step Ⅵ Homework ‎1. Read the passage again and review the new words and expressions.‎ ‎2. Prepare the debate in groups.‎ ‎3. Preview Using Language ― WHAT CAN WE DO ABOUT GLOBAL WARMING？‎ The Third Period Extensive ‎Reading Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 pollution, electrical, motor, can (n.), microwave, disagreement, title, make a difference, put up with, leave an electrical appliance on, so long as, and so on ‎ b. 重点句式 P30‎ Together, individuals can make a difference.‎ It takes a lot of energy to make things from new materials…‎ Remember — your contribution counts.‎ ‎2. Ability goals 能力目标 Get the students to realize what individuals can do about global warming.‎ ‎3. Learning ability goals 学能目标 Learn what to do in daily life to reduce the carbon dioxide content in the air.‎ Teaching important points 教学重点 Enable the students to know what to do in daily life to reduce the carbon dioxide content in the air.‎ Teaching difficult points 教学难点 Enable the students to learn how to make a poster.‎ Teaching methods 教学方法 Listening, skimming and group work.‎ Teaching aids 教具准备 A recorder and a computer.‎ Teaching procedures & ways 教学过程与方式 StepⅠRevision Check the students’ homework to see whether they have mastered what they learnt last class.‎ Check their group work — debate. ‎ T: Have you finished your homework — prepare a debate in groups?‎ Ss: Yes.‎ T: Which groups would like to come to the front and act out your debates? Choose one as your representative.‎ Ask a representative in each group to state their group’s opinion.‎ A sample debate: (A=Group A; B=Group B)‎ A: We think people should do something about global warming. Because it could have many negative effects on the earth. With temperature increasing, the polar ice caps eventually would melt, causing sea levels to rise by several meters. Coastal and low-lying cities would be submerged. Some scientists predict severe storms, droughts, famines, the spread of diseases and the destruction of species. Don’t you think these are terrible? So don’t hesitate to take action to reduce the carbon dioxide content in the air. Only in this way will we be able to save the earth and save ourselves.‎ B: We don’t think so. Some scientists’ concerns about global warming are just speculation. I want to remind everyone to pay attention to what Group A has just said. You said a lot of “could” and “would”, which obviously indicates that you are not sure about the bad effects you just mentioned. In our opinion, global warming will be mild with few bad environmental consequences. What’s more, more carbon dioxide is actually a positive thing. It will make plants grow faster; crops will produce more; it will make a greater range of animals, all of which will make life for humans better. So there’s no need for us to reduce the carbon dioxide.‎ A: It is true that no one knows exactly what the effects of global warming will be. But don’t you think it will be too late for us to take action after the bad effects come out? Hope for the best and prepare for the worst.‎ B: ...‎ Step Ⅱ Lead-in T: Group A did a good job and showed us the importance of reducing the amount of carbon dioxide in the air. But what shall we do in our daily life?‎ Sa: Save energy. For example, if we are not using the lights, the TV, the computer and so on, turn　them off.‎ Sb: Cars use a lot of energy, so we’d better walk or ride a bike. ‎ Sc: Buy things made from recycled materials because it takes a lot of energy to make things from new materials.‎ T: Right. You’ve done a good job. Next open your books and turn to page 30. Today we’ll read two letters and learn what we can do about global warming.‎ Step Ⅲ Listening and Reading Get the students to read the two letters and then fill in the table on page 30.‎ T: Skim the letters and find who the writers are and what their purpose of writing the letters is. ‎ Sd: The first letter is written by a student who is asking for suggestions for his project — global warming.‎ Se: The second letter is written by an editor of Earth Care magazine. He offers the student some suggestions on what to do about global warming. ‎ T: Good answers. Now scan the letter and list Earth Care’s suggestions and then in groups, discuss whether you think you can carry out each suggestion. Give reasons for your answers.‎ Sample answers: ‎ Earth Care’s suggestions Can you carry it out?‎ Reasons If you are not using electrical appliances, turn Yes Save ‎ energy ‎ them off.‎ If you’re cold, put on more clothes instead of turning up the heat.‎ Yes Save energy Motor vehicles use a lot of energy, so walk or ride a bike if you can.‎ Yes Save energy Recycle cans, bottles, plastics and newspapers and buy things made from recycled materials.‎ Yes Save energy Get your parents or friends to buy products that are made to save energy.‎ Yes Save energy Plant more trees.‎ Yes Plants absorb carbon dioxide from the air.‎ Talk with your family and friends about global warming and tell them what you’ve learned.‎ Yes Together, individuals can make a difference.‎ Step Ⅳ Making a poster Help the students learn how to make a poster. The teacher may collect some posters or pictures about the environment and show them to the students in class. ‎ T: Now in groups of five, make a poster for your school that tells the students various ways they can reduce the amount of carbon dioxide in the air. Remember the following: give your poster a large heading, use imperative sentences to list the ways we can reduce the amount of carbon dioxide in the air. What’s more, try every possible way to make your poster impressive, which is the purpose of a poster. If time is limited, you can finish it after class.‎ Step Ⅴ Homework Finish the poster.‎ The Fourth Period Language Study Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 glance, widespread, decrease, steady, average, existence, outer, on the whole ‎ b. 重点句式 It is human activity that has caused this global warming. P29‎ ‎…it is the burning of more and more fossil fuels that is resulting in this increase in carbon dioxide. P26‎ ‎2. Ability goals 能力目标 Learn about “it” used for emphasis.‎ ‎3. Learning ability goals 学能目标 Help the students learn how to use new words and expressions of this unit and how to use “it” for emphasis.‎ Teaching important points 教学重点 The structure of “It is ... that ...”.‎ Teaching difficult points 教学难点 Teach the students how to master the use of “it” for emphasis.‎ Teaching methods 教学方法 Explanation and practice.‎ Teaching aids 教具准备 A computer.‎ Teaching procedures & ways 教学过程与方式 Step ⅠRevision T: Good morning, everyone.‎ Ss: Good morning, sir / madam.‎ T: First I’ll check your homework. Have you finished the poster?‎ Ss: Yes.‎ T: Well, which group would like to show us yours?‎ Get several groups to show their posters.‎ A sample poster:‎ What Can We Do about Carbon Dioxide?‎ Carbon dioxide is one of the main causes of global warming which will bring the earth catastrophe. Here are a few ways that individuals can follow to reduce its content in the air.‎ ‎● Turn the electrical appliances off if you are not using them.‎ ‎● Put on more clothes if you are cold instead of turning up the heat.‎ ‎● Walk or ride a bike instead of using motor vehicles if you can.‎ ‎● Recycle cans, bottles, plastics and newspapers; buy things made from recycled materials.‎ ‎● Buy products that are made to save energy such as fridges and microwaves.‎ ‎● Plant trees in your garden or school yard.‎ Together, individuals make a difference. It’s time for us to do something about carbon dioxide. Talk with your friends or family about global warming. Let’s work together and care the planet we are living in.‎ Step Ⅱ Discovering words and expressions T: Now please open your books and turn to page 28. Let’s do some exercises. ‎ Step Ⅲ Discovering useful structures T: Next let’s turn back to page 29. We’ll learn a useful structure. Now compare these two sentences below.‎ Show the following two sentences on the screen.‎ Human activity has caused this global warming.‎ It is human activity that has caused this global warming.‎ T: Who can translate them into Chinese?‎ Sa: I think they are the same. They both mean“人类行为引发了全球变暖”.‎ Sb: I don’t think so. They are a little bit different. The latter one should be “引发全球变暖的正是人类行为”. In the second sentence, “human activity” is emphasized.‎ T: Quite right. This is the structure we are going to learn today.‎ Present the structure on the screen and give some explanation.‎ 由it 引导的强调句结构:‎ It is (was) + 被强调部分 + that (who) + 句子其他部分 注意：此结构强调的成分仅限于主语，宾语和状语。‎ 如：‎ 原句：My father did the experiment in the lab yesterday evening.‎ 强调主语： It was my father who did the experiment in the lab yesterday evening.‎ 强调宾语： It was the experiment that my father did in the lab yesterday evening.‎ 强调时间： It was yesterday evening that my father did the experiment in the lab.‎ 强调地点： It was in the lab that my father did the experiment yesterday evening. ‎ 又如：‎ It was in that city that we met for the first time.　　　 ‎ It was not until he told me that I knew the truth.‎ 典型例题分析:‎ ‎1） It was last night _______ I saw the film Star Wars.‎ A. who B. when C. that D. which 答案C. 强调句的结构是： It + be + 强调部分 + that (who) + 主谓句。强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用who，其余用that。‎ ‎2） It is ten years _______ Miss Green returned to Canada.‎ A. that B. when C. since D. as 答案C. 考点是连词用法。 本题易误选为A. ‎ 其实本句不是强调句。若是，去掉It be ... that还应是一个完整的句子。而本句去掉‘It is ...that’，只剩下ten years Miss Green returned to Canada不成句。因此本句不是强调句。 It is + 时间 + since ...,　其中is = has been.‎ T: In the article there are two sentences in which “it” is used for emphasis. Can you find them?‎ Sc: Yes. One is “It was a scientist called Charles Keeling who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997.” The other is “It is the burning of more and more fossil fuels that is resulting in this increase in carbon dioxide.”‎ T: Good. Next let’s do some practice about this structure. Turn to page 29, Exercise 2. Please rewrite each sentence with “It is ... that ...” to give more emphasis to the underlined part.‎ Sample answers:‎ ‎1. It is greenhouse gases that have warmed the earth by trapping heat energy in the atmosphere.‎ ‎2. It is the greenhouse effect that gives the earth’s surface the average temperature of ‎15℃‎.‎ ‎3. It is fossil fuels that much of the energy used to light and heat our homes comes from.‎ ‎4. It is the United States of America that the biggest producer of greenhouse gases is.‎ ‎5. It is for centuries that carbon dioxide stays in the atmosphere while other greenhouse gases stay in the atmosphere only for a day or less.‎ ‎6. It is their very existence that low-lying countries feel is in danger from rising sea levels.‎ ‎7. It is human activities that many scientists believe that have caused the earth’s temperature to rise.‎ ‎8. It is future climate changes and their effects on our environment that scientists want to find out about.‎ ‎9. It is by several meters that the level of the sea could rise because of global warming ‎ in the years ahead.‎ ‎10. It is outer space that might provide us with new energy sources in the future.‎ Step IV Using structures Get the students to do more exercises about the use of “it” for emphasis.‎ T: Please turn to page 64. Read the instructions of the two exercises and then finish them.‎ Sample answers to Exercise 2:‎ ‎(1) It was four Australian children who started it in 1996 when they organized the first children’s environmental conference.‎ ‎(2) It is at this conference that we decide which projects we want to work on in the following year.‎ ‎(3) It was through one of these projects about five years ago that I first became involved in Millennium Kids.‎ Step Ⅵ Homework Make four sentences with “it” for emphasis.‎ The Fifth Period Drills Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 environmental problem, plastic bags, reuse, litter, rubbish items, Clean Up Day, bring up b. 重点句式 P63‎ I’m sorry to bring this up, but ...‎ I’m sorry to have to say this, but ...‎ They shouldn’t have done it.‎ They are to blame. ‎ Why don’t you do something about it?‎ Perhaps they should / ought to do ...‎ ‎2. Ability goals 能力目标 Enable the students to talk about some environmental problems and Clean Up Day.‎ ‎3. Learning ability goals 学能目标 Help the students learn how to express their own ideas about some environmental problems.‎ Teaching important points 教学重点 Enable the students to talk about some environmental problems.‎ Teaching difficult points 教学难点 Enable the students to talk about some environmental problems.‎ Teaching methods 教学方法 Listening, speaking and group work. ‎ Teaching aids 教具准备 A recorder, a computer and a projector.‎ Teaching procedures & ways 教学过程与方式 Step Ⅰ Revision Check the homework to see whether the students have mastered the use of “it” for emphasis. ‎ T: Last class we learned about “it” used for emphasis. Do you remember the structure?‎ Ss: Yes. The structure is: It is (was) ... + that (who) + ...‎ T: Now, who would like to read the sentences you have written as homework.‎ Sample sentences:‎ It was James who broke the window.‎ It was the little ants that destroyed the whole building.‎ It is her grandma who brings her up all these years.‎ It was the hope in his heart that enabled him to escape from the prison.‎ Step Ⅱ Listening Get the students to prepare for the listening by asking some questions.‎ T: In this unit we have talked much about global warming, which obviously causes great concern all over the world. Many organizations have been set up to protect the environment, one of which is Millennium Kids. Have you ever heard about it?‎ Ss: No.‎ T: Would you like to know something about it?‎ Ss: Yes.‎ T: OK. We’ll listen to a dialogue about it. Please open your workbooks and turn to page 62. Please read the instructions and questions fast to find out the listening points first. Pay much attention to the key points while listening.‎ Play the tape for the first time. Help the students get a general understanding about the dialogue. The students listen and try to answer questions in Exercise 2. Play the tape again, train the students’ ability to pick out specific information. The students listen and fill in the information sheet in Exercise 3. Play the tape for a third time and let the students check their answers by themselves.‎ T: Have you finished the questions?‎ Ss: Yes.‎ T: OK, let’s check the answers together.‎ Explain some difficult points if necessary.‎ Step Ⅲ Talking T: From what we’ve just listened to, we can see global warming is only one of the environmental problems. There are many other problems. Can you give me some examples?‎ Sa: Air pollution and water pollution.‎ Sb: Deforestation.‎ Sc: ...‎ T: You are right. Many environmental problems endanger the world we are living in. ‎ The teacher may as well collect some pictures about environmental problems an d show them to the students through a computer. One of the pictures should be about plastic bags. ‎ T: What can you see in the picture?‎ Ss: We can see lots of plastic bags and a beach seriously polluted by plastic bags.‎ T: What do you think plastic bags do to the environment?‎ Sd: I think they pollute the environment and they are a big environmental problem.‎ T: Do you agree with him?‎ Se: Yes. I don’t like using plastic bags because they are bad for our health. I also heard that plastic bags can not be reused and therefore it is a great waste to use them.‎ T: It’s true that plastic bags do great harm to the environment. It’s time that we did something about this big environmental problem. Now work in small groups, discuss the questions in TALKING on page 63. The expressions below the questions may help you.‎ Ask some groups to show their work.‎ A sample discussion:‎ Sa: Plastic bags can be seen everywhere. Some people always leave litter everywhere including plastic bags.‎ Sb: Yes. They shouldn’t have done it. Sometimes we even find plastic bags hanging on trees. They spoil the beauty of the cities.‎ Sc: Apart from the facts that you mentioned, plastic bags are doing great harm to the environment.‎ Sa: What do you mean? Is it a very big environmental problem?‎ Sc: Yes.‎ Sb: Can you explain why?‎ Sc: First, plastic bags are made from non-renewable resources. ‎ Sa: Does it mean those resources are lost to us if they are not recycled?‎ Sc: Exactly. Second, plastic bags pollute the soil because they can hardly break down.‎ Sb: It sounds terrible!‎ Sc: The bad effects are more than that. Plastic bags kill seabirds, sea mammals and countless fish each year world wide.‎ Sb: But how does this come about?‎ Sc: Plastic bags float easily in air and water and travel long distances. What’s worse, when the animals die and break down, the plastic bag can become free again to kill another animal.‎ Sa: It’s time for people to do something about this problem.‎ Sb: Yes. But how? We have to face the fact that 2 billion plastic bags are used every day in China. It’s impossible to stop it in one day!‎ Sc: Yes. But people can use fewer and reuse them. ‎ Sa: So let’s do it right now. And we should let more and more people know it. ‎ Sb: Right. Hope everyone can do something to it. Together, individuals can make a big difference. ‎ Step Ⅳ Listening task and Speaking task T: Though there are many serious environmental problems, fortunately most countries realize these problems and they are taking steps to save the earth. Clean Up Australia Day is a good example. Next we’ll listen to Tom’s talk about it.‎ Play the tape for the first time. Help the students get a general understanding about the talk. Play the tape again, let the students pay attention to the dates Tom mentioned and what happened on these dates. While listening, ask the students to make some notes in the table on page 65. Play the tape for the third time, let them have a check.‎ T: OK, let’s check the answers to Exercise 1. ‎ Explain some difficult points if necessary.‎ Ask the students to read the top 9 rubbish litter Tom mentioned in his talk and let them talk about litter at their school or communities. ‎ ‎...‎ T: Like Australia, China also has a Clean Up Day. Do you know something about it?‎ Ss: No.‎ T: OK. It doesn’t matter. After class, collect some information about Clean Up China Day. You are asked to plan a talk about it. Work in groups of three, follow the steps in the bottom on page 65 to prepare the talk. That is your homework for today.‎ Step Ⅴ Homework Prepare a talk about Clean Up China Day.‎ The Sixth Period Writing Teaching goals 教学目标 ‎1. Target language 目标语言 a. 重点词汇和短语 litter, butt, pollute, endanger, solution, add up to, break down ‎ b. 重点句式 P66‎ Apart from the fact that butts spoil the beauty of the environment, they contain some very toxic chemicals.‎ It is up to people not to let plastic bags become litter. ‎ The earth would be a better place because it would be less polluted.‎ ‎2. Ability goals 能力目标 Enable the students to write an essay on one of the environmental problems.‎ ‎3. Learning ability goals 学能目标 Enable the students to learn how to write an essay.‎ Teaching important points 教学重点 The structure of an essay.‎ Teaching difficult points 教学难点 Enable the students to learn how to support their points of view.‎ Teaching methods 教学方法 Task-based method.‎ Teaching aids 教具准备 A computer and a projector.‎ Teaching procedures & ways 教学过程与方式 Step Ⅰ Revision and Lead-in Check the homework. Ask two groups to present their talk to the class.‎ T: In the last period, we talked about plastic bags. What do you think of plastic bags?‎ S: Plastic bags are widely used all over our country. Many people use them to carry food or other things. But I think they are annoying and they seriously pollute our environment. ‎ T: You are right. Plastic bags are also known as white pollution. They endanger our environment and people’s health. Now, let’s read an article and find how they endanger the environment. I hope after reading the article, all of you can realize the harm of using plastic bags and use fewer of them.‎ Step ⅡReading T: Open your workbooks and turn to page 66. Read Tom’s essay about litter. Make a summary for each paragraph, and then fill in the table on page 67. You don’t have to write down complete sentences, notes will be OK. Pay attention to the writing skills while reading.‎ Sample answers:‎ Paragraph 1‎ Point of view Two of the most common and dangerous litter: cigarette butts and plastic bags.‎ Paragraph 2‎ First point of the argument; Evidence Cigarette butts are small but bad for the environment: over 1,600 billion cigarettes are smoked each year and large quantities of butts are thrown away; Butts contain toxic chemicals; Decrease the quality of water; Endanger plants and animals Paragraph 3‎ Second point of the argument; Evidence Plastic bags litter is a danger to the environment: Waste of non-renewable resources; Last from 20 to 1,000 years in the environment; Kill up to one million seabirds, 100,000 sea mammals and countless fish every year Paragraph 4‎ Point of view The best solution would be not to smoke or use plastic bags at all.‎ T: This article is an essay. Essay is a short literary composition on a single subject, usually presenting the personal view of the author. After reading the article, can you summarize the writing characteristics of the essay?‎ S: Let me try. In the first paragraph, the author presents his point of view on butts and bags. And in the next two paragraphs, he separately presents his views on butts and bags and provides evidences to support his views. In the last paragraph, he states his views again and calls up people to do something to our planet.‎ Step Ⅲ Pre-writing T: After reading this essay, I’d like you to write an essay on your own. I will give you some tips on how to write an essay.‎ Show the tips on the screen.‎ Writing tips:‎ Step 1: Write out the thesis statement.‎ ‎(point of view)‎ Step 2: Write out the topic sentence of the first body paragraph.‎ Step 3: Give the supporting points and details about the first subtopic.‎ Step 4: Write out the topic sentence of the second body paragraph.‎ Step 5: Give the supporting points and details about the second subtopic.‎ ‎(more body paragraphs ... )‎ The last step: State again the thesis statement.‎ ‎(point of view)‎ Step Ⅳ Writing Ask the students to list as many environment topics as possible. Choose one topic and write an essay about it.‎ T: Now think of the environmental problems that concern people most. I will divide you into two groups. Each group tries to give as many environment topics as possible. Let’s see which groups get more topics.‎ Ask the students to speak out the topics and collect them on the screen or blackboard.‎ A sample list of environment topics:‎ air pollution, noise, soil erosion, water pollution, litter classification, desertification, make green by planting trees T: Now choose a topic from the list that you feel strongly about. Make notes on your topic using headings similar to those in the table above. Use Tom’s essay as a model to write your own.‎ A sample version:‎ The Environmental Effects of Fossil Fuels There is no doubt that fossil fuels bring a lot of good to us. But do you know that many of the environmental problems our country faces today result from our fossil fuel dependence. ‎ The environment faces air pollution, global warming, acid rain, and several other very serious problems because of our use of fossil fuels. Over the last 150 years, burning of fossil fuels has resulted in more than 25 percent increase in carbon dioxide in our atmosphere. Carbon dioxide is one of the main factors in global warming which is negatively affecting everyone. ‎ Fossil fuels also affect water pollution, land pollution, and thermal pollution(heat pollution). Coal mining is one of the causes of pollution in the environment. After the mining is completed, the land will remain barren. Materials other than coal are also brought to the surface in the coal mining process, and these are left as solid wastes. ‎ The production, transportation, and use of fossil fuels are to blame for the effects of pollution on the environment. Then what should we do? We should spare no effort to improve our environment. Please save energy and use fewer fossil fuels in our daily lives.‎ Step Ⅴ Homework ‎1. Finish the essay. ‎ ‎2. Review the whole unit by doing SUMMING UP on page 32 and CHECK YOURSELF on page 68.‎ 附 件 相关背景资料 Global warming may be twice as bad as feared The impact of global warming could be twice as severe as the worst scenario feared by United Nations scientists, the world’s largest climate-modelling experiment has shown. ‎ Average temperatures could rise by ‎11℃‎ (20) to reach highs that would change the face of the globe, researchers who have run 60,000 computer simulations of climate change said yesterday. ‎ The conclusions suggest that forecasts by the UN’s Intergovernmental Panel on Climate Change (IPCC) may be much too conservative. In the worst case, the world would eventually heat up by almost double the maximum increase envisaged by the panel. The IPCC’s latest report predicted that temperatures will rise by between ‎1.4℃‎ (2.5) and ‎5.8℃‎ (10.4) by 2100. ‎ A world ‎11℃‎ warmer than it is today would be unrecognisable: while records show that the planet has been hotter than it is today for about 80 per cent of its history, there is no evidence that it has ever been more than about ‎7℃‎ warmer. ‎ Although it would take hundreds of years for the full effects to be felt, the polar ice caps eventually would melt completely, causing sea levels to rise by ‎70m to ‎100m (‎230ft to ‎330ft). Coastal and low-lying cities such as London and New York would be ‎ submerged. ‎ As the ‎11℃‎ figure is a global average, temperatures would be expected to climb even further in some regions. ‎ David Stainforth, of the University of Oxford, the study’s chief scientist, said: “When I start to look at these figures, I get very worried about them. An 11-degree warmed world would be a dramatically different world.”‎ Global warming According to the National Academy of Sciences, the Earth’s surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. There is new and stronger evidence that most of the warming over the last 50 years is attributable to human activities. ‎ Human activities have altered the chemical composition of the atmosphere through the buildup of greenhouse gases — primarily carbon dioxide, methane, and nitrous oxide. The heat-trapping property of these gases is undisputed although uncertainties exist about exactly how earth’s climate responds to them. ‎ Energy from the sun drives the earth’s weather and climate, and heats the earth’s surface; in turn, the earth radiates energy back into space. Atmospheric greenhouse gases, such as water vapor, carbon dioxide, trap some of the outgoing energy, retaining heat somewhat like the glass panels of a greenhouse. ‎ Without this natural “greenhouse effect”, temperatures would be much lower than they are now, and life as known today would not be possible. Instead, thanks to ‎ greenhouse gases, the earth’s average temperature is a more hospitable ‎60°F. ‎ However, problems may arise when the atmospheric concentration of greenhouse gases increases. Once, all climate changes occurred naturally. However, during the Industrial Revolution, we began altering our climate and environment through changing agricultural and industrial practices. ‎ Before the Industrial Revolution, human activity released very few gases into the atmosphere, but now through population growth, fossil fuel burning, and deforestation, we are affecting the mixture of gases in the atmosphere. ‎ Carbon dioxide is released to the atmosphere when solid waste, fossil fuels and wood products are burned. Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from the decomposition of organic wastes in municipal solid waste landfills, and the raising of livestock. Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels. ‎ Rising global temperatures are expected to raise sea level, and change precipitation and other local climate conditions. Changing regional climate could alter forests, crop yields, and water supplies. It could also affect human health, animals, and many types of ecosystems and deserts may expand into existing rangelands. Unless we act now, our children will inherit a hotter world, dirtier air and water, more severe floods and droughts, and more wildfires. ‎ But solutions are in sight. We know where most heat-trapping gases come from: power plants and vehicles. And we know how to curb their emissions: modern technologies and stronger laws. By shifting the perception of global warming from abstract threat to pressing reality, and promoting online activism. By pressing businesses to use less energy and build more efficient products. And by fighting for laws that will speed these advances. ‎ What is Clean Up Australia Day Every year hundreds of Australians help clean up their local environment on Clean Up Australia Day.‎ It’s easy, fun and everyone can take part.‎ Individuals, local groups and schools can either organise a Clean Up site, or volunteer to join an existing site.‎ So why not do your bit for the environment and get involved next year?‎ Clean Up Australia Day in 2005‎ Across the country over 670,000 volunteers removed more than 8,450 tonnes of rubbish from our beaches, parks, streets, bush land and waterways as part of Clean Up Australia Day, the nation’s largest community based environmental event.‎ Families, friends, neighbours, businesses and community groups spent the equivalent of 62,163 days, at over 7,000 sites, removing rubbish ranging from car bodies and electronic waste to thousands of chip packets, drink bottles, plastic bags and cigarette butts.‎ Speaking from the Clean Up Australia Day site in Taren Point, Sydney, Ian Kiernan AO, Chairman && Founder of Clean Up Australia, praised volunteers and site organisers around the country. ‎ ‎“Taren Point captures perfectly the real long term benefits of Clean Up Australia Day and reinforces that Clean Up is more than just one day. Volunteers at Taren Point have begun to transform a rubbish dump, polluting the delicate salt marshes, back into a natural recreational area for us all to enjoy,” Mr Kiernan said.‎ ‎“Congratulations to the thousands of volunteers who spent their time removing packaging waste and illegally dumped items from the environment today. Their actions show government and industry that Australians do care about the environment.” he continued. ‎ At this stage, the country’s most polluted sites appear to be roadways followed by parks, waterfronts and coastal areas.‎ Some of the amazing accomplishments of volunteers during this year’s campaign include the clean up of 1,545 roadsides, 738 parks and 1,387 waterways and coastal areas.‎ Weird and interesting items collected around the country today include an unopened slab of beer and a bottle of whiskey, two headless garden statues, a bride’s veil, an electric guitar, a plastic monkey and a chair up a tree. ‎ The most common rubbish items found were plastic and glass bottles, chip and confectionary packets, plastic bags and cigarette butts. ‎ ‎“Sadly these rubbish items continue to end up in the environment when plastic containers should be recycled, cigarette butts should be binned and we should all being saying no to plastic bags,” Mr Kiernan said.‎ ‎“It is estimated that only 20% of plastic packaging is recycled, this is far below paper recycling at 80%. This is not good enough and I urge government and industry to take action immediately by setting strong targets for the National Packaging Covenant and investing more resources to address this issue,” he continued. ‎ The Clean Up Australia Day campaign is one time during the year when Australians get physical about cleaning up the environment. It also provides the platform to implement positive environmental practices every day of the year.‎ Australians can continue to clean up by supporting Clean Up Australia’s Say No to Plastic Bags and Personal Ashtray campaigns, the Mobile Phone Recycling program and by making use of the new computer and electronics recycling initiative recently established by Collex, Major Sponsor of Clean Up Australia Day.‎