人教版英語選修6 Unit4 Global warming(ppt)

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1、Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!Work in groups -list things as required :1. Things that use energy around us or at any other places,( ie. light)2.Sources of energy (ie. coal)Warming up I ( m ) Things that use energy around us or at any other places:In a houseThings that use

2、energySources of energylights television cassette player computerfridge stove washing machine hairdryer video recorder coal oilnatural gas wind(power)sun(solar energy) water(hydro-electric power) the sea ( tidal energy) uranium(nuclear energy)plant waster(biomass energy)WINDMILLS, RENEWABLE.What? Re

3、newable?Warming up II ( 5 m )WHAT? WHAT KIND? RENEWABLE?A coal power station , non-renewable.WHAT? WHAT KIND? RENEWABLE?An oil refinery(精煉廠精煉廠), non-renewable.WHAT? WHAT KIND? RENEWABLE?A nuclear power plant, non-renewable.WHAT? WHAT KIND? RENEWABLE?A hydro-electric dam, renewable.GUESS IT! Uranium

4、Ore (鈾礦石鈾礦石) The element uranium does not occur in pure form in nature but is found in minerals such as carnotite（釩鉀鈾礦（釩鉀鈾礦）, pictured here.WHAT SOURCE OF ENERGY? Geysers(間歇泉間歇泉)GEOTHERMAL (地?zé)岬牡責(zé)岬? ENERGY PLANTCoalOilNatural gasUraniumWind (wind power)Sun (solar energy)Water (hydro-electric power)Pl

5、ant waste (biomass energy)Hot springs or geysers (geothermal energy)The sea (tidal energy)Fossil fuelsNon-renewableRenewableWHAT ARE FOSSIL FUELS? Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, which can be burnt to pro

6、duce energy. Also known as non-renewable energy because once they are used they have gone forever; they cannot be renewed.WHAT ABOUT THE WEATHER?9 / 14We needPre-reading ( 3m )THE SUN. HOW ABOUT THE PLANTS?IF LACK OF SOLAR ENERGY, THE PLANTSGreenhouseGREENHOUSE GASES!What are greenhouse gases?Whats

7、greenhouse effect?Lets see the following picture about it.Global WarmingReadingRead the passage again to find out the answers to the questions in Ex.1Reading I scanning (5m)1.Who wrote the magazine article? What is the name of the magazine?2.What are the names of the three scientists mentioned in th

8、e article? Sophie Armstrong, Earth Care. Dr Janice Foster, Charles Keeling, George Hambley. There are some very different attitudes among scientists towards this issue. Some think the effects will be terrible, while some others believe that we should not worry about it.3. What do they think about gl

9、obal warming? Do they agree with one another? The first graph shows the temperature increase of one degree Fahrenheit between 1860 to 2000. The second graph shows the carbon dioxide content in the atmosphere from 1957 to 1977. Global warming / the warming of the earth4. What are the two graphs about

10、?5. What is the main topic of the article?Read the passage carefully and judge whether the statements are true or false?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 global warming is

11、caused b the burning fossil fuels.4. Natural gas is a greenhouse gas.FFTFReading II-skimming (5m)5. Carbon dioxide is a byproduct of burning fossil fuels.6. People accept Charles Keelings data because he took accurate measurements.7. Flooding could be one of the effects of future global warming.8. G

12、eorge Hambley believes scientists are just guessing about the effects of global warming.TTTT9. George Hambley is worried about the effects of carbon dioxide on plant growth.10. It is clear what the effects of global warming will be.FFHow many parts can the text be divided into?Tips:Part 1 (para _)Pa

13、rt 2 (para _ to _)Part 3 (para _ to _)Part 4 (para _ to _)12451011Reading III-detailed reading (8m)Main ideas of each partWriting techniquesPart 1: introduce _Raising _Part 2:illustrate_giving _ using _Part 3:list_giving _,making _Part 4:Its up to readers to think and decide _Using _,leaving readers

14、 to think over the issue a debate over the issue of global warminga question how global warming comes about examples, graphs, explanation two different attitudes among scientists towards global warmingexamples, whether people should do something about global warming or not.a questioncontrastCHOICES.

15、1. Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1977?A. Dr. Janice Foster. B. Charles Keeling.C. George Hambley. D. Sophie Armstrong.BReading IV (3m)2. But there are some very different attitudes among scientists towards this issue.“ Issue here means the same as the one

16、in_.A. I bought the new stamp the day of its issue. B. They are talking about one of the key issues in the election campaign.C. The government is expected to issue a statement about the election.D. The magazine has 12 issues each year.B3. The author probably agrees that _A. actually global warming i

17、s good for man.B. we should do nothing about the global warming.C. catastrophes will happen if the globe keeps on warming.D. a lot remains to be found out about the effects of global warming.DTHE DIFFERENT IDEAS BETWEEN DR. JANICE FOSTER & GEORGE HAMBLEY Dr. Janice FosterGeorge HambleyCarbon dioxide

18、 has caused the global temperature to _. An increase of five degrees would be a _ and could be _.More carbon dioxide is a _ thing,which makes crops _ and will en- courage _.go upcatastropheVery seriouspositiveproducea greater range of animalsReading V (4m)SummarySkim over the passage, and tell what

19、you have learnt in class. Try to talk in general terms rather than in details.eg: I learnt that the earth is becoming warmer. I learnt that global warming could have terrible effects on the environment. .DebateABA : We shall do something about global warming.B: We shall do nothing about global warmi

20、ng.Assignment1.Read the passage again and review the new words and expressions.2.Prepare the debate in groups.3.Surf the Internet for more information about global warming.Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!ANSWER KEYS FOR EX.1 ON PAGE 28:1.data kept on2. quantities; run out3.

21、build up; catastrophe4. come about; risk5. Climate6. pared to8.phenomenon9. graph 10. perChecking answer I (2m)ANSWER KEYS FOR EX.2 ON PAGE 28:The first graph shows the global _ between _ and _. The temperature _ and decreased over this period but on the whole it _ by around _ and its highest in 200

22、0. There was a steady _ in the temperature during the twenty years after 1980. We can see from the graph that the earth has become _ since early last century.temperature18602000increased1910roseincrease/risewarmerChecking answer II (3m)ANSWER KEYS FOR EX.2 ON PAGE 28:The second graph shows the amoun

23、t of _in the atmosphere from _ to _ .The carbon dioxide _ steadily over this forty-year period. It went up from 315 to 370 parts _million.carbon dioxide19571997increase/ went upperANSWER KEYS FOR EX.1 OF “REVISING USEFUL STRUCTURES” ON PAGE 22:1. being attacked2. Being held up3. Being included4. Hav

24、ing been accepted5. being told6. Being helped out7. being taken8. being photographed9. being swallowed10. being thrown aboutChecking answer III (3m)強調(diào)句型強調(diào)句型強調(diào)句型，你掌握了嗎？強調(diào)句型，你掌握了嗎？一、一、 It is/was+ 被強調(diào)部分被強調(diào)部分 + that+剩余的部剩余的部分分 被強調(diào)部分是人被強調(diào)部分是人 who/whom/ that +剩余的部分剩余的部分 注意注意 1. 強調(diào)句的連接詞一般只用強調(diào)句的連接詞一般只用 that

25、 ； 強調(diào)人時，強調(diào)人時，可用可用who (主語主語) 或或 whom (賓語賓語).2. 強調(diào)句的時態(tài)一般為強調(diào)句的時態(tài)一般為“It was+that”3. 強調(diào)句的一般疑問句句型：強調(diào)句的一般疑問句句型：Is / Was +it +所強所強調(diào)的部分調(diào)的部分+that / who/ whom?4. 強調(diào)句的一般疑問句句型：疑問詞強調(diào)句的一般疑問句句型：疑問詞 +所強調(diào)的所強調(diào)的部分部分+that / who/ whom?1. 我是在街上遇見她的父親的。我是在街上遇見她的父親的。(強調(diào)在街上強調(diào)在街上)2. 你是你是8點開始工作的嗎？（強調(diào)時間點開始工作的嗎？（強調(diào)時間）3. 正是因為她病了，

26、他們才沒見她做這項工作。正是因為她病了，他們才沒見她做這項工作。4. 他為什么不能回答這個問題？他為什么不能回答這個問題？It was in the street that I met her father.Was it at eight oclock that you began to work?Because she was ill, they didnt ask her to do the job.It was because she was ill that they didnt ask her to do the job.Why was it that he couldnt answ

27、er the question.（強調(diào)原因）（強調(diào)原因）判斷是否是強調(diào)句是，可把判斷是否是強調(diào)句是，可把 It is / was that 去去掉，剩余部分在不增減任何詞的情況下還是掉，剩余部分在不增減任何詞的情況下還是一個完整的句子，那么這種句子是強調(diào)句。一個完整的句子，那么這種句子是強調(diào)句。It was in the street that I met her father. In the street I met her father. It was because she was ill that they didnt ask her to do the job.Because she

28、 was ill, they didnt ask her to do the job.二、二、 not . until . 的強調(diào)形式的強調(diào)形式: It is not until + 被強調(diào)部分被強調(diào)部分 + that . “直到直到才才”，主要用于強調(diào)時間狀語的強調(diào)句型。主要用于強調(diào)時間狀語的強調(diào)句型。 I didnt realize she was a famous film star until she took off her dark glasses. Not until she took off her dark glasses did I realize she was a fa

29、mous film star. It was not until she took off her dark glasses that I realized she was a famous film star.三、三、 句子句子的強調(diào)手段的強調(diào)手段：do / does / did + 動詞原形動詞原形e.g 我的確相信他是老實人。我的確相信他是老實人。I do believe that he is an honest man.他們昨天的確去看過你，但沒見到你。他們昨天的確去看過你，但沒見到你。They did go to see you yesterday, but failed to me

30、et you. 四、四、 What +從句從句+ is / was 是名詞從句結(jié)構(gòu)，常用來強調(diào)主語、賓語。是名詞從句結(jié)構(gòu)，常用來強調(diào)主語、賓語。e.g他最希望的是成為一名飛行員。（強調(diào)賓語）他最希望的是成為一名飛行員。（強調(diào)賓語）What he wishes most is to become a pilot. 所敘述的是所敘述的是現(xiàn)在或者將現(xiàn)在或者將來來發(fā)生的事情發(fā)生的事情What +從句從句 is 所敘述的是所敘述的是過去過去發(fā)生的發(fā)生的事情事情What +從句從句 was What interested me most was the beautiful scenery. 給予我們鼓勵的

31、是他為我們樹立的榜樣。給予我們鼓勵的是他為我們樹立的榜樣。（強調(diào)強調(diào)主語主語）What encouraged us was the example he set for us. What +從句從句+ is / was 使我最感興趣的是那美麗的風(fēng)景。使我最感興趣的是那美麗的風(fēng)景。 （強調(diào)主語強調(diào)主語）鞏固練習(xí)：鞏固練習(xí)：1.It was _ he said _disappointed me.A. what ; that B. that; thatC. what; what D. that; what2. Is it in the factory _ this type of cars are

32、produced?A. which B. where C. that D. / 3. Is it the factory_ this type of cars are produced ?A. which B. where C. that D. /4. _ on Monday night that all this happened?A. Is it B. It is C. Was it D. It was5. It was _ the old worker came that we _ the experiment.A. until; didnt begin B. not until; be

33、ganC. until began D. not until; didnt begin 6. It is I _ singing in the garden.A. who are B. who is C. that am D. that is7. -Why didnt you answer when I spoke to you in the street this morning? -I _ but you didnt hear me.A. did answer B. didnt want to answer C. couldnt answer D. was too busy8. It is

34、 in the west of China _ there is no doubt _it is going to rain tomorrow.A. where; whether B. that; thatC. that; whether D. where; that 9. It was 1969_ the American astronauts succeeded in landing on the moon.A. that B. when C. on which D. which10. It was the training _ he had as a young man _made hi

35、m such a famous writer.A. when; that B. that; when C. that; who D. that; that1. It was about 600 years ago _ the first clock with a face and an hour hand was made. (NMET 1997) A. that B. until C. before D. when2. It was only when I reread his poems recently _ I began to appreciate their beauty. (NME

36、T 1998) A. until B. that C. then D. soAB高考鏈接3. It is these poisonous products _ can cause the symptoms of the flu, such as headache and aching muscles. (NMET 2003上海上海)A.who B. that C. how D. what4. Why! I have nothing to confess. _ you want me to say? (NMET 2004上海上海)A. What is it that B. What it is

37、thatC. How is it that D. How it is thatBA5. It was _ back home after the experiment. (NMET 2004湖北湖北)A. not until midnight did he goB. until midnight that he didnt goC. not until midnight that he wentD. until midnight when he didnt go6. It was with great joy _ he received the news that his lost daugh

38、ter had been found. (NMET 2004福建福建)A. because B. which C. since D. thatCDAssignment Review the grammar and then finish the exercises on P29.Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!What can we do about What can we do about global warming?global warming? We should do something about g

39、lobal warming. Because it could have many negative effects on the earth. With the 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,

40、 the spread of diseases and the destructions of species. WHAT CAN WE DO ABOUT GLOBAL WARMING?What shall we do in our daily life?Task 1:Skim the first letter, and answer the questions below:1. Who is the writer?2. What is the purpose of the email? / What are the two concerns of the email?1. Who is th

41、e writer?2. What is the purpose of the letter? / What are the two concerns of the letter?A student named Ouyang Guang. His opinion that, as an individual, he can have no effect on environmental problems. Getting some suggestions for what he can do about global warming ; Task 2: Read the second email

42、, and answer the question:Do Earth Care agree with Ouyang Guangs opinion that individuals can have no effect?No, Earth Care dose not agree.Task 3: Now scan the letter and list Earth Cares suggestions in the chart on P30, and discuss whether you can carry out each suggestion. Give reason for you answ

43、ers.Earth Cares suggestionCan you carry it?ReasonEarth Cares suggestionCan you carry it?ReasonIf you are not using electrical appliances, turn them off. YesSave energyIf youre cold, put on more clothes instead of turning up the heat.YesSave energyMotor vehicles use a lot of energy, so walk or ride a

44、 bike if you can.YesSave energyRecycle cans, bottles, plastics and newspapers and buy things made from recycled materials.YesSave energyEarth Cares suggestionCan you carry it?ReasonGet your parents or friends to buy products that are made to save energy.YesSave energyPlant more treesYesPlants absorb

45、 carbon dioxide from the airTalk with your family and friends about global warming and tell them what youve learned.YesTogether, individuals can make a difference.Clean up Your Butts and BagsRead Toms essay about litter. Make a summary for each paragraph, and then fill in the following table.Reading

46、 task on 66First para.Point of viewSecond para.First point of the argumentEvidence Third para.Second point of the argument EvidenceFourth para.Point of viewFirst para.Point of viewSecond para.First point of the argumentEvidence Cigarette buts and plastic bags are a serious environmental problem.Butt

47、s are small but are still bad for the environment.1.1600 billion cigarettes are smoked each year in China. Many of these become litter. 2.4.5 trillion butts are littered every year in the world.3.Butts are ugly.4.Butts contain toxic chemicals. These get into the water supply. These decrease the qual

48、ity of the water and endanger living things.5.Butts take up to 5 years to break down, so the toxic chemicals add up to a great amount.Evidence:Third para.Second point of the argument EvidencePlastic bags are a danger to the environment.1.Plastic bags are made from non-renewable resources. If they ar

49、e not recycled, these resources are lost to us.2.In china, 2 billion plastic bags are used every day.3.Plastic bags last from 20 to 1,000 years in the environment.Fourth para.Point of viewThe environment would be less polluted if we cleaned up cigarette butts and plastic bags. The best solution woul

50、d be not to smoke or use plastic bags at all.AssignmentIn groups of four, make a poster for the school that tells the students various ways they can reduce the amount of carbon dioxide in the air.Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!ListeningPre-listening:Read Exercise 1 together

51、: Read the statements below and tick the ones you agree with.fossil fuels; renewable; nuclear powerWhat are the meaning of the following words ?Chernobyl 切爾諾貝利切爾諾貝利 （蘇聯(lián)烏克蘭北部（蘇聯(lián)烏克蘭北部城市）城市）First listening: Listen and decide which statement Professor Chen does not agree with. 1.Well have to stop using

52、fossil fuels.2.About 90% of the worlds energy comes from fossil fuels.3.We can replace fossil fuels with renewable sources of energy.4.Nuclear power is a good source of energy.5.In the future, well need new technologies to replace fossil fuels.6.Its the developed countries who are to blame for produ

53、cing most of the carbon dioxide.Second listening: Listen again and tick the phrases that Professor Chen uses to agree or disagree with Li Bin.Exactly. Im afraid I disagree with you.Thats true. Im afraid not.Thats right. I dont think so.Thats correct. No way.I agree. I dont agree. XXXXThird listening

54、: fill in sentences by filling the following blanks:1.Our modern _ societies depend on the energy we get from_.2.Its a very _ and cheap form of energy.3.Cant we just _ fossil fuels with _ sources of energy like sun or wind power?4.However, whatever we do, we have to do it as a _.5.The _ countries ar

55、e really the ones to _.Third listening: fill in sentences by filling the following blanks:1.Our modern _ societies depend on the energy we get from_.2.Its a very _ and cheap form of energy.3.Cant we just _ fossil fuels with _ sources of energy like sun or wind power?4.However, whatever we do, we hav

56、e to do it as a _.5.The _ countries are really the ones to _.industrialfossil fuelsconcentratedreplacerenewableglobal communitydevelopedblameRead 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 other

57、s you know. Professor Chen: Whatever we do, we have to do it as a global community. That means developed and developing countries will have to work together.Li Bin: But its not the developing countries who put most of the carbon dioxide into the air. The developed countries are really the ones to bl

58、ame. Speaking:A sample versionS1: I agree with Li Bin. It is the developed countries are really the ones to blame and to pay for that.S2: Well, Im afraid I disagree with. Professor Chen is right. Whatever we do, we have to do it as a global community. Developed and developing countries should work t

59、ogether to improve the environment.S3: I hold the same viewpoint as Li Bin. In developed countries people are producing a large amount of carbon dioxide., which contributes to global warming. Isnt it their duty to do something to decrease the speed of global warming? S1: Exactly.S2: It is true that

60、the developed countries are the ones to blame and they should do something. But is it right for developing countries to look on without doing anything? Remember we have only one earth, which is like a big family. All of us are family members. Think about this: in a family, if one child makes a mista

61、ke, what should his brothers or sisters do-blame him without doing anything or help him correct the mistake?S1: I see. We should take part in the action instead of looking on and complaining. S3: I agree, too. Thank you. Ive got a better understanding about this.Finish exercises in the workbook. Ass

62、ignmentUnit 4 Global WarmingUnit 4 Global WarmingSave the earth!In the reading task, the writer is presenting one side of an argument and trying to persuade his readers to agree with him. In the first paragraph, he states his point of view. He starts each of the middle paragraphs with a sentence tha

63、t states a point and then he presents evidence that supports his point. In the last paragraph, he states his point of view again.Discuss the environmental problems that concern people most in groups of four. And list as many environment topics as possible, then write them on a piece of paper.Speakin

64、gChoose a topic from the list that you feel strongly about. Make notes on your topic using headings similar to the table in the reading task. Use the passage as a model.WritingWrite out the thesis statement. (point of view)Write out the topic sentence of the first body paragraph.Give the supporting

65、points and details about the first subtopic.Write out the topic sentence of the second body paragraph.Give the supporting points and details about the second subtopic.State again the thesis statement.Step 1Step 2Step 3Step 4Step 5The last stepWriting tipsA sample version:The Environmental Effects of

66、 Fossil FuelsThere 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 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 af