高中英语第二册上Unit9SavingtheearththeFirstPeriodWord格式文档下载.docx

1、IIITeaching time：Five periodsIVBackground Information1Protect The Ozone Layer In the middle of winter，when snow is falling in many parts of the United States,scientists have sounded a warning to people who plan to spend many hours in the sun this summerThe warning：The suns summer-time rays are more

2、dangerous than oncethought A team of scientists from 80 nations recently reported to the United Nations that a layer of ozone in the atmosphere, which protects humans from harmful levels of ultraviolet radiation，will be thinner over the United States this summerThe thinner 1ayer allows more ultravio

3、let rays from the sun to reach the earthThe extra amount of ultraviolet radiation could cause an increase in the number of cases of skin cancer Scientists first became concerned about the ozone layer in the mid-1980s when a hole was discovered in the layer above Antarctica during the winterThe hole

4、was caused by chemicals used in refrigerators and air conditionersWhen these chemicals are sent out into the atmosphere, they produce gases that destroy the ozone Concern about the protective ozone layer rose more recently when data from satellites and ground stations showed that ozone levels were d

5、ropping over areas other than AntarcticaLow ozone levels were recorded in the spring and summer over the United States and over other populated areas in the world Although many countries have already begun stopping the use or ozonedestroying chemicals, the new findings are expected to advance the ti

6、metable for a total ban of the chemicals2PollutionPeople today all over the world are beginning to hear and learn more and more about tile problem of pollutionPollution is caused either by the release（排放）of pletely new and often artificial substances into the environment, or by releasing greatly inc

7、reased amounts of a natural substancesuch as oil from oil tankers into the seaWith the development of modern industry，many of the goods and machines we need and use in our daily lives are creating a number of waste products which upset the environment balanceMany of these waste products can be preve

8、nted if people pay more attention，but clearly while more and more new goods are produced and made plex，there will be new dangerous wastes to be thrown away，for example，the waste products from nuclear power stationsMany people，therefore, see pollution as only part of a larger and more plex problem Th

9、ere is no doubt that much of the pollution caused could be controlled if only panies, individuals and government would make more effortsIn the home there is an obvious need to control litter and wasteFood es wrapped up three or four times in packages that all have to be got rid of；drinks are increas

10、ingly sold in bottles or times which cannot be reusedThis not only causes a litter problem，but also is a great waste of resources，in terms of glass，metals and paperAdvertising has helped this process by persuading many of us not only to buy things we neither want nor needbut also to throw away much

11、of what we do buyPollution and waste bine to be a problem everyone can help to solve by cutting unnecessary buying, over consumption and careless release of the products we use in our daily livesThe First PeriodTeaching Aims：1.Train the students listening ability2.Improve the studensspeaking ability

12、 by talking about nature ecology and the environment3.Learn and master some useful expressions for supporting an opinion4.Help the students to know something about the pollutionTeaching Important Points：1Improve the studentsspeaking ability2Improve the studentslistening ability3Help the students to

13、learn to support an opinionTeaching Difficult Points：1How to improve the studentsspeaking and listening abilitiesTeaching Methods1Listening-and-answering activity to help the students go through the listening material2Discussion to make the students practice supporting an opinion3Individual，pair or

14、group work to make every student work in classTeaching Aids：1the multimedia2a tape recorder3the blackboardTeaching Procedures：Step I GreetingsGreet the whole class as usualStep II Warming up （Show the pictures on the screen）T: Look at these pictures. How beautiful they are! Do you want to pay a visi

15、t to these places?Ss：YesT：But in some places，its not so beautiful Look at the picturesplease （Show the following pictures on the screen） What can you see in the pictures?S：1 can see a river，which is pollutedThe river water is very dirtyI can see smoke ing from many chimneys，and the air is darkThe ai

16、r is pollutedGoodWhich problem do you think is the biggest one facing the earth?I think it is the water pollutionWhy do you think so?Because if water is pollutedPeople will not be able to get clean water to drink；therefore，many people will get sickIts terribleVery goodWho has a different opinion?I t

17、hink the air pollution is the biggest problemBecause if the air is polluted， there will not be clean air for us to breatheEverybody will get terrible diseasesQuite rightNow，who can tell us what causes these problems?I think it is because people pay no attention to our environmentThey pourwaste water

18、 into rivers，1akes and seas without cleaning itThe air pollution is caused by the factoriesPeople build factories to developthe industry，but they never pay attention to controlling the pollutionTheharmful smoke should be made harmless before it goes into the air，but few factories would like to do so

19、 because this will cost muchVery goodNow，who knows what we can do to solve these problems?I think our government should pay more attention to environmental protectionThey should check the factories as often as possible to make sure they dont pour waste water into rivers or lakes and make sure they d

20、ont letharmful smoke go into the airGood ideaNow，please open your books and turn to Page 65There are six pictures in Warming upWe have just talked about two of themNow，work in groups of four to talk about the other picturesAnswer the questions below the pictures （A while 1ater，ask some students to a

21、ct out）Step III Preparation for Listening and ListeningVery goodI think youre known something about our environment.Now，please turn to Page 66Look at the picture in ListeningWhat can you see?A person is making a speech to the audienceCan you guess what speech she is giving?Maybe about our earthOKNow

22、，lets listen to the tapeIll play it twice for youListen carefullyto answer the questions in Part 1（Play the tape twice for Ss to listen and write down their answersThen ask some students to read out their answersCheck with the whole classThe teacher says the following）GoodYoure done very well But fr

23、om the passage we know that she hasnt finished her speechWhat do you think she wi1l say next? Have a short discussion in pairsplease（Ss have a short discussion and then the teacher asks one or two pairs to say their answers）Well doneNow1ets listen to the second partListen carefully to outline the sp

24、eakers two arguments. Fill in the table in Part 2Are you ready?OKLets begin（Play the tape twice for Ss to Listen and write down their answersPause the tape if necessary. Then ask several students to read out their answers）Now，lets listen to the tape again to check your answers（Play the tape once mor

25、e and then check the answers with the whole class）GoodP1ease think a bout what the speaker will say nextYou call use what you have heard on the tape to predict what will e nextMake an outline like the one in the table and then write down what you think the speaker will sayYou can work in pairs or gr

26、oups of four as you like （A moment 1ater，ask some students to read out their paragraphs and pare different speeches to choose the best one）Step SpeakingWell done! Weve talked much about pollutionWe know that pollution is a big problem facing the earthBut why cant we stop the pollution? Why doesnt our government shut down the factories that pollute the environment badly? Who knows?I think o