Unit4《GlobalWarming》说课稿2人教版选修6.docx

1、Unit4GlobalWarming说课稿2人教版选修6Unit 4 Global WarmingPeriod 1 Warming UpTeaching Goals:1. To arouse students interest in learning about global warming.2. To get students to know the energy source.Teaching procedures:Step 1. Leading-inPurpose: To activate students and arouse them to talk about global war

2、ming.T: Hello, everyone. Today we are going to read about global warming. But first lets think about what moves the world around .Yes, it is energy. But what is energy? Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be ma

3、de to do, or how much heat it can produce or absorb .In the past, energy was discussed in terms of easily observable effects it has on the properties of objects or changes in state of various systems. Basically, if something changes, some sort of energy was involved in that change. Renewable energy

4、sources like wind power dont emit carbon dioxide.Step 2 Warming upPurpose: To lead students to the topic of this unit.1. Pair workGet students to ask each other the following questions, and then ask them to present it before the class.(1) What is energy?(2) Where does it come from?(3) What energy so

5、urces are renewable?(4) What energy sources are non-renewable?2. Group work(1) Get students to talk about sources of energy according to the photos in the textbook.The above pictures can be used for Ss to talk about, and Ss can also talk as much as they can.By learning Warming Up we all know that en

6、ergy is so important, but where does it come from?There are different forms of energy: Wind energy 风能 Heat energy 热能 Chemical Chemical energy 化学能源 Nuclear energy 核能 Solar energy 太阳能 Water power 水力发电能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类

7、利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料(2) Conclusion When energy changes from one form to another, the amount of energy stays the same. Energy cannot be made or destroyed. This fact is called “conservation of energy”. Matter can be made into energy through processes like nuclear

8、fission and nuclear fusion.3. Competition: Take the quiz below and see whether Ss can fill in the blanks.Things thatuse energySources of energyRenewable/non-renewablelightsheatingtelevisioncassette playervideo recordercomputer fridgestovewashing machinehairdryercoal(1) Noil(2) Nnatural gas(3) Nwind

9、(wind power)(4) Rsun (solar energy)(5) Ruranium (nuclear energy)(6) Nwater (hydro-electric power)(7) Rplant waste (biomass energy)(8) Rhot springs or geysers(geothermal energy)(9) Rthe sea (tidal energy)(10)RSuggested Answers: (1) non-renewable; (2) non-renewable; (3) non-renewable; (4) renewable; (

10、5) renewable (6) non-renewable; (7) renewable; (8) renewable; (9) renewable; (10) renewable4. HomeworkWrite a short composition about sources of energy.Period 2 Pre-reading, Reading, ComprehendingTeaching Goals:1.To read about global warming.2.To get some idea about the effect of global warming.3.To

11、 develop some basic reading skills.Teaching Procedures:Step 1. Warming UpPurpose: To arouse Ss interest in learning about global warming.1. Team workAnswer the questions below:(1) Have you ever seen a greenhouse?(2) How does a greenhouse work?(3) What do you think greenhouse gases do?2. Group work L

12、ook at the picture, and ask Ss some questions.T: What is this building made of? S1: Its made of plastic.T: Whats its purpose?S2: Plants can grow in it when its cold outside.T: How does it work?S3: The glass traps the heat from the sun, making the air warm so that plants grow better.Step 2. Pre-readi

13、ngPurpose: To get Ss to learn about greenhouse gases.1. Group workNow look at the word “GREENHOUSE GASES”. What does it mean?Greenhouse gases (GHG) are gaseous components of the atmosphere that contribute to the greenhouse effect .The major natural greenhouse gases are water vapor, which causes abou

14、t 36-70% of the greenhouse effect on Earth (not including clouds): carbon dioxide, which causes between 9-26%; and ozone, which causes between 3-7%(note that it is not really possible to assert that such-and-such a gas causes a certain percentage of the GHE, because the influences of the various gas

15、es are not additive .The higher ends of the ranges quoted are for the gas alone ;the lower end ,for the gas counting overlaps).Naturally occurring greenhouse gases include water vapor, carbon dioxide, methane, nitrousoxide, and ozone. Certain human activities, however, add to the levels of most of t

16、hese naturally occurring gases.Very powerful greenhouse gases that are not naturally occurring include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6), which are generated in a variety of industrial processes.Each greenhouse gas differs in its ability to absorb heat

17、 in the atmosphere. HFCs and PFCsare the most heat-absorbent.2. Individual workGet Ss to answer these questions individually. Then let them discuss the answers.(1) Who wrote the magazine article? What is the name of the magazine?(2) What are the names of the three scientists mentioned in the article

18、?(3) What do they think about global warming? Do they agree with one another?(4) What are the two graphs about?(5) What is the main topic of the article?Step 3. Reading1. SkimmingPurpose: To get a brief understanding of the text.Read through the text, preferably the first and the last sentences of e

19、ach paragraph and write the key sentence of each paragraph.Key sentences of each paragraph:(1) A debate over whether it is human activity that has caused the global warming or whether it is just a natural phenomenon.(2) Many scientists believe people have caused the increase in the earths temperatur

20、e.(3) The increased extra amount of carbon dioxide traps more heat energy causing the global temperature to go up.(4) The levels of carbon dioxide have increased greatly over the last 100 to 150 years.(5) There are some different attitudes towards the causes of this increase in carbon dioxide.(6) Ov

21、er the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius but it could be as much as 5 degrees Celsius.(7) An increase of five degrees would be a catastrophe.(8) Future warming would cause the sea level to rise by several meters.(9) Some predict any warming will be mild

22、 with few bad environmental consequences.(10) More carbon dioxide is a positive thing.(11) No one knows what the effects of global warming will be.2. ScanningPurpose: To get Ss to have some details in the text.Read the article carefully. Are these statements true or false? Write a T for each true se

23、ntence and an F for each false sentence.(1) The temperature last century didnt increase much. ( )(2) Everyone believes that global warming is caused by the activities of humans. ( )(3) Janice Foster believes that burning fossil fuels causes global warming. ( )(4) Natural gas is a greenhouse gas. ( )

24、(5) Carbon dioxide is a byproduct of burning fossil fuels. ( )(6) People accept Charles Keeling s data because he took accurate measurements. ( )(7) Flooding could be one of the effects of future global warming. ( )(8) George Hambley believes scientists are just guessing about the effects of global

25、warming.( )(9) Geroge Hambley is worried about the effects of carbon dioxide on plant growth. ( )(10) It is clear what the effects of global warming will be. ( )Suggested Answers:(1) F (2) F (3) T (4) F (5) T (6) T (7) T (8) T (9) F (10) F3. ListeningPurpose: To train Ss listening ability.Listen to

26、the tape and follow it in a low voice.4. Group workSs are divided into four groups. Each group is supposed to read through each part and then discuss them. Part 1 (Paragraph 1)(1) compare 比较 常见用法： comparewith 把和比较Compared with him, I am fast. compareto 把比作Life is often compared to voyage.(2) come ab

27、out发生How did it come about? 那事是怎么发生的? 常见词组：come across 偶遇；碰到 come round 恢复知觉，come along 进展；进行 come to 涉及；到达；共计come out 公开；问世；出版 come to oneself 恢复知觉come up with 想出(4) phenomenon n 现象It is only a social phenomenon, but not a phenomenon of nature. Part 2 (Paragraph 2, 3, 4)(1) fuel n 燃料Dont leave the

28、engine switched on .It wastes fuel. 拓展：fuel v 加油；补给燃料The car is being fuelled ready to try to beat the speed record.(2) quantities of大量Large quantities of money have been spent on the bridge. 拓展： a large quantity of大量的He ate a large quantity of nice.(3) per prep 每; 每一The fruit costs 30 pence per kil

29、o.How much do you earn per week? Part 3 (Paragraph 5,6,7,8,9)(1) data n 资料; 数据We havent got enough data.(2) result in导致The accident resulted in the death of two passengers.It resulted in success. 拓展：result from 由于His illness resulted from eating bad food.(3) catastrophe n 突如其来的大灾难；大灾祸The war was a t

30、errible catastrophe in which many people died.(4) climate n 气候We have a mild climate here. (5) consequence n 结果；后果；影响As a consequence of being in hospital, Shelly decided that she wanted to become a nurse. 常见词组：in consequence 因此，由此in consequence of 由于的缘故(6) state vt 陈述；说明The busmen have stated that

31、the strike will continue until general agreement is reached about pay and working conditions.(7) range n & v 种类；范围；幅度There is a wide range of temperature.气温变化很大。 vi (在一定范围内)变化The number ranges between 5 and 15. vt 排列，整理Please range the goods neatly in the shop window. Part 4 (Paragraph 10)(1) build up逐步建立；增加；增进We need to build up our reputation.Traffic is building up on roads into the city.(2) Keep on 继续 Price kept on increasing. He didnt stop running; he just kept