Unit9Savingtheearth-theFirstPeriod1.BriefStatementsBased0ntheUnitInthisunit,Sswilldosomelisteningspeaking,readingandwritingpractice.Also,theywilllearntousetheInversion.Inthefirstperiod,Sswi1limprovetheirspeakingabilitybytalkingaboutnatureecologyandtheenvironmentandtheywilllistentosomelisteningmaterialaboutourenvironment.Afterthestudyofthisperiod,theywillimprovetheirspeakingandlisteningabilitiesandalsoknowsomethingabouttheproblemsfacingtheearth.Inthesecondperiod,SswillreadapassageabouttheEarthSummit.FromthepassageSswillknowmoreabouttheimportanceofprotectingourearth.Inthethirdperiod.Sswillstudythegrammaritem:Inversion.Afterdoingsomeexercisesprovidedinthisperiod.andwiththehelpoftheteacher,SswillknowhowtousetheInversion.TeachermayprovidemoreexercisesforSstoconsolidateifnecessary.Inthelastperiod,SswilllistentotwospeechesfromtheEarthSummitandfinishthepracticeprovidedinthefirstpart.SswillknowmoreabouttheEarthSummitandimprovetheirlisteningability.Inthewritingpart,Sswillimprovetheirwritingabilitybywritinganevaluationparagraphwiththehelpofsomegivenexpressions.Afterthestudyofthisunit.Sswillknowhowtosupportanopinion,andtheywillknowmoreaboutenvironmentprotection.Theywillknowthatifallofusmakesmallchanges.wecouldmakeabigdifference.Theywilldomoretoprotectourearth.II.TeachingGoals1.Talkaboutnatureecologyandthe、environment.2.Practisesupportinganopinion.3.Learntouseinversion.4.Writeanevaluationparagraph.III.Teachingtime:FiveperiodsIV.BackgroundInformation1.ProtectTheOzoneLayerInthemiddleofwinter,whensnowisfallinginmanypartsoftheUnitedStates,scientistshavesoundedawarningtopeoplewhoplantospendmanyhoursinthesunthissummer.Thewarning:Thesun'ssummer-timeraysaremoredangerousthanoncethought.Ateamofscientistsfrom80nationsrecentlyreportedtotheUnitedNationsthatalayerofozoneintheatmosphere,whichprotectshumansfromharmfullevelsofultravioletradiation,willbethinnerovertheUnitedStatesthissummer.Thethinner1ayerallowsmoreultravioletraysfromthesuntoreachtheearth.Theextraamountofultravioletradiationcouldcauseanincreaseinthenumberofcasesofskincancer.Scientistsfirstbecameconcernedabouttheozonelayerinthemid-1980swhenaholewasdiscoveredinthelayeraboveAntarcticaduringthewinter.Theholewascausedbychemicalsusedinrefrigeratorsandairconditioners.When用心爱心专心115号编辑thesechemicalsaresentoutintotheatmosphere,theyproducegasesthatdestroytheozone.ConcernabouttheprotectiveozonelayerrosemorerecentlywhendatafromsatellitesandgroundstationsshowedthatozonelevelsweredroppingoverareasotherthanAntarctica.LowozonelevelswererecordedinthespringandsummerovertheUnitedStatesandoverotherpopulatedareasintheworld.Althoughmanycountrieshavealreadybegunstoppingtheuseorozone—destroyingchemicals,thenewfindingsareexpectedtoadvancethetimetableforatotalbanofthechemicals.2.PollutionPeopletodayallovertheworldarebeginningtohearandlearnmoreandmoreabouttileproblemofpollution.Pollutioniscausedeitherbytherelease(排放)ofcompletelynewandoftenartificialsubstancesintotheenvironment,orbyreleasinggreatlyincreasedamountsofanaturalsubstance.suchasoilfromoiltankersintothesea.Withthedevelopmentofmodernindustry,manyofthegoodsandmachinesweneedanduseinourdailylivesarecreatinganumberofwasteproductswhichupsettheenvironmentbalance.Manyofthesewasteproductscanbepreventedifpeoplepaymoreattention,butclearlyw...