廣東省陸河外國語學校高二英語《module6 Unit 4 Global warming》教案 人教版選修6

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111 U Teaching goals 教學目標 1. Target language 目標語言 a. 重點詞匯和短語 energy, light (v.), heat (v.), renewable, non-renewable, fuel, blame, run out b. 交際用語 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 能力目標 Enable the students to talk about different sources of energy and express their own ideas. 3. Learning ability goals 學能目標 Help the students learn how to give their ideas about the use of energy. Teaching important points 教學重點 Enable the students to express agreement and disagreement. Teaching difficult points 教學難點 Enable the students to learn how to express agreement and disagreement. Teaching methods 教學方法 Brainstorming, listening and group work. Teaching aids 教具準備 A tape recorder and a computer. Teaching procedures & ways 教學過程與方式 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 教學目標 1. Target language 目標語言 a. 重點詞匯和短語 compare, phenomenon, graph, fuel, trap, data, climate, catastrophe, consequence, range, per, glance, compare to, come about, fierce debate, result in, build up b. 重點句式 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 能力目標 Enable the students to talk about the causes and effects of global warming. 3. Learning ability goals 學能目標 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教學重點 Help the students learn how to debate over the topic “We should do nothing about global warming.” Teaching difficult points 教學難點 Enable the students to learn the writing skills of the text and get a better understanding of articles of this kind. Teaching methods 教學方法 Listening, reading and group work. Teaching aids 教具準備 A recorder and a computer. Teaching procedures & ways 教學過程與方式 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 教學目標 1. Target language 目標語言 a. 重點詞匯和短語 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. 重點句式 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 能力目標 Get the students to realize what individuals can do about global warming. 3. Learning ability goals 學能目標 Learn what to do in daily life to reduce the carbon dioxide content in the air. Teaching important points 教學重點 Enable the students to know what to do in daily life to reduce the carbon dioxide content in the air. Teaching difficult points 教學難點 Enable the students to learn how to make a poster. Teaching methods 教學方法 Listening, skimming and group work. Teaching aids 教具準備 A recorder and a computer. Teaching procedures & ways 教學過程與方式 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 them off. Yes Save energy 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 教學目標 1. Target language 目標語言 a. 重點詞匯和短語 glance, widespread, decrease, steady, average, existence, outer, on the whole b. 重點句式 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 能力目標 Learn about “it” used for emphasis. 3. Learning ability goals 學能目標 Help the students learn how to use new words and expressions of this unit and how to use “it” for emphasis. Teaching important points 教學重點 The structure of “It is ... that ...”. Teaching difficult points 教學難點 Teach the students how to master the use of “it” for emphasis. Teaching methods 教學方法 Explanation and practice. Teaching aids 教具準備 A computer. Teaching procedures & ways 教學過程與方式 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“人類行為引發(fā)了全球變暖”. Sb: I don’t think so. They are a little bit different. The latter one should be “引發(fā)全球變暖的正是人類行為”. 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 引導的強調(diào)句結(jié)構(gòu): It is (was) + 被強調(diào)部分 + that (who) + 句子其他部分 注意：此結(jié)構(gòu)強調(diào)的成分僅限于主語，賓語和狀語。 如： 原句：My father did the experiment in the lab yesterday evening. 強調(diào)主語： It was my father who did the experiment in the lab yesterday evening. 強調(diào)賓語： It was the experiment that my father did in the lab yesterday evening. 強調(diào)時間： It was yesterday evening that my father did the experiment in the lab. 強調(diào)地點： 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. 典型例題分析: 1）It was last night _______ I saw the film Star Wars. A. who B. when C. that D. which 答案C. 強調(diào)句的結(jié)構(gòu)是： It + be + 強調(diào)部分 + that (who) + 主謂句。強調(diào)句的連詞只有兩個，that和who。當強調(diào)的部分是人，且為句子的主語時，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. 考點是連詞用法。 本題易誤選為A. 其實本句不是強調(diào)句。若是，去掉It be ... that還應是一個完整的句子。而本句去掉‘It is ...that’，只剩下ten years Miss Green returned to Canada不成句。因此本句不是強調(diào)句。 It is + 時間 + 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 fu