高中英语第二册上Unit9SavingtheearththeFirstPeriodWord格式文档下载.docx
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III.Teachingtime:
Fiveperiods
IV.BackgroundInformation
1.ProtectTheOzoneLayer
Inthemiddleofwinter,whensnowisfallinginmanypartsoftheUnitedStates,
scientistshavesoundedawarningtopeoplewhoplantospendmanyhoursinthesunthissummer.Thewarning:
Thesun'
ssummer-timeraysaremoredangerousthanonce
thought.
Ateamofscientistsfrom80nationsrecentlyreportedtotheUnitedNationsthatalayerofozoneintheatmosphere,whichprotectshumansfromharmfullevelsofultravioletradiation,willbethinnerovertheUnitedStatesthissummer.Thethinner1ayerallowsmoreultravioletraysfromthesuntoreachtheearth.Theextraamountofultravioletradiationcouldcauseanincreaseinthenumberofcasesofskincancer.
Scientistsfirstbecameconcernedabouttheozonelayerinthemid-1980swhenaholewasdiscoveredinthelayeraboveAntarcticaduringthewinter.Theholewascausedbychemicalsusedinrefrigeratorsandairconditioners.Whenthesechemicalsaresentoutintotheatmosphere,theyproducegasesthatdestroytheozone.
ConcernabouttheprotectiveozonelayerrosemorerecentlywhendatafromsatellitesandgroundstationsshowedthatozonelevelsweredroppingoverareasotherthanAntarctica.LowozonelevelswererecordedinthespringandsummerovertheUnitedStatesandoverotherpopulatedareasintheworld.
Althoughmanycountrieshavealreadybegunstoppingtheuseorozone—destroying
chemicals,thenewfindingsareexpectedtoadvancethetimetableforatotalbanofthechemicals.
2.Pollution
Peopletodayallovertheworldarebeginningtohearandlearnmoreandmoreabouttileproblemofpollution.Pollutioniscausedeitherbytherelease(排放)ofpletelynewandoftenartificialsubstancesintotheenvironment,orbyreleasinggreatlyincreasedamountsofanaturalsubstance.suchasoilfromoiltankersintothesea.Withthedevelopmentofmodernindustry,manyofthegoodsandmachinesweneedanduseinourdailylivesarecreatinganumberofwasteproductswhichupsettheenvironmentbalance.Manyofthesewasteproductscanbepreventedifpeoplepaymoreattention,butclearlywhilemoreandmorenewgoodsareproducedandmadeplex,therewillbenewdangerouswastestobethrownaway,forexample,thewasteproductsfromnuclearpowerstations.Manypeople,therefore,seepollutionasonlypartofalargerandmoreplexproblem.
Thereisnodoubtthatmuchofthepollutioncausedcouldbecontrolledifonlypanies,individualsandgovernmentwouldmakemoreefforts.Inthehomethereisanobviousneedtocontrollitterandwaste.Foodeswrappedupthreeorfourtimesinpackagesthatallhavetobegotridof;
drinksareincreasinglysoldinbottlesortimeswhichcannotbereused.Thisnotonlycausesalitterproblem,butalsoisagreatwasteofresources,intermsofglass,metalsandpaper.
Advertisinghashelpedthisprocessbypersuadingmanyofusnotonlytobuythingsweneitherwantnorneed.butalsotothrowawaymuchofwhatwedobuy.Pollutionandwastebinetobeaproblemeveryonecanhelptosolvebycuttingunnecessarybuying,overconsumptionandcarelessreleaseoftheproductsweuseinourdailylives.
TheFirstPeriod
TeachingAims:
1.Trainthestudents’listeningability.
2.Improvethestudens’speakingabilitybytalkingaboutnatureecologyandtheenvironment.
3.Learnandmastersomeusefulexpressionsforsupportinganopinion.
4.Helpthestudentstoknowsomethingaboutthepollution.
TeachingImportantPoints:
1.Improvethestudents’speakingability.
2.Improvethestudents’listeningability.
3.Helpthestudentstolearntosupportanopinion.
TeachingDifficultPoints:
1.Howtoimprovethestudents’speakingandlisteningabilities.
TeachingMethods
1.Listening-and-answeringactivitytohelpthestudentsgothroughthelisteningmaterial.
2.Discussiontomakethestudentspracticesupportinganopinion.
3.Individual,pairorgroupworktomakeeverystudentworkinclass.
TeachingAids:
1.themultimedia
2.ataperecorder
3.theblackboard
TeachingProcedures:
StepIGreetings
Greetthewholeclassasusual.
StepIIWarmingup
(Showthepicturesonthescreen.)
T:
Lookatthesepictures.Howbeautifultheyare!
Doyouwanttopayavisitto
theseplaces?
Ss:
Yes.
T:
Butinsomeplaces,it’snotsobeautifulLookatthepictures.please.
(Showthefollowingpicturesonthescreen.)
Whatcanyouseeinthepictures?
S:
1canseeariver,whichispolluted.Theriverwaterisverydirty.
Icanseesmokeingfrommanychimneys,andtheairisdark.Theairispolluted.
Good.Whichproblemdoyouthinkisthebiggestonefacingtheearth?
Ithinkitisthewaterpollution.
Whydoyouthinkso?
Becauseifwaterispolluted.Peoplewillnotbeabletogetcleanwatertodrink;
therefore,manypeoplewillgetsick.It’sterrible.
Verygood.Whohasadifferentopinion?
Ithinktheairpollutionisthebiggestproblem.Becauseiftheairispolluted,therewillnotbecleanairforustobreathe.Everybodywillgetterriblediseases.
Quiteright.Now,whocantelluswhatcausestheseproblems?
Ithinkitisbecausepeoplepaynoattentiontoourenvironment.Theypour
wastewaterintorivers,1akesandseaswithoutcleaningit.
Theairpollutioniscausedbythefactories.Peoplebuildfactoriestodevelop
theindustry,buttheyneverpayattentiontocontrollingthepollution.The
harmfulsmokeshouldbemadeharmlessbeforeitgoesintotheair,butfew
factorieswouldliketodosobecausethiswillcostmuch.
Verygood.Now,whoknowswhatwecandotosolvetheseproblems?
Ithinkourgovernmentshouldpaymoreattentiontoenvironmentalprotection.Theyshouldcheckthefactoriesasoftenaspossibletomakesuretheydon’tpourwastewaterintoriversorlakesandmakesuretheydon’tlet
harmfulsmokegointotheair.
Goodidea.Now,pleaseopenyourbooksandturntoPage65.TherearesixpicturesinWarmingup.Wehavejusttalkedabouttwoofthem.Now,workingroupsoffourtotalkabouttheotherpictures.Answerthequestionsbelowthepictures.
(Awhile1ater,asksomestudentstoactout.)
StepIIIPreparationforListeningandListening
Verygood.Ithinkyou’reknownsomethingaboutourenvironment.
Now,pleaseturntoPage66.LookatthepictureinListening.Whatcanyousee?
Apersonismakingaspeechtotheaudience.
Canyouguesswhatspeechsheisgiving?
Maybeaboutourearth.
OK.Now,let’slistentothetape.I’llplayittwiceforyou.Listencarefully
toanswerthequestionsinPart1.
(PlaythetapetwiceforSstolistenandwritedowntheiranswers.Thenasksomestudentstoreadouttheiranswers.Checkwiththewholeclass.Theteachersaysthefollowing.)
Good.You’redoneverywell.Butfromthepassageweknowthatshehasn’tfinishedherspeech.Whatdoyouthinkshewi1lsaynext?
Haveashortdiscussioninpairs.please.(Sshaveashortdiscussionandthentheteacherasksoneortwopairstosaytheiranswers.)Welldone.Now.1et’slistentothesecondpart.Listencarefullytooutlinethespeaker’stwoarguments.FillinthetableinPart2.Areyouready?
OK.Let’sbegin.
(PlaythetapetwiceforSstoListenandwritedowntheiranswers.Pausethetapeifnecessary.Thenaskseveralstudentstoreadouttheiranswers.)
Now,let’slistentothetapeagaintocheckyouranswers.(Playthetapeoncemoreandthenchecktheanswerswiththewholeclass.)Good.P1easethinkaboutwhatthespeakerwillsaynext.Youcallusewhatyouhaveheardonthetapetopredictwhatwillenext.Makeanoutlineliketheoneinthetableandthenwritedownwhatyouthinkthespeakerwillsay.Youcanworkinpairsorgroupsoffourasyoulike.
(Amoment1ater,asksomestudentstoreadouttheirparagraphsandparedifferentspeechestochoosethebestone.)
StepⅣSpeaking
Welldone!
We’vetalkedmuchaboutpollution.Weknowthatpollutionisabigproblemfacingtheearth.Butwhycan’twestopthepollution?
Whydoesn’tourgovernmentshutdownthefactoriesthatpollutetheenvironmentbadly?
Whoknows?
Ithinko