Unit9Savingtheearth1．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1thesechemicalsaresentoutintotheatmosphere,theyproducegasesthatdestroytheozone．ConcernabouttheprotectiveozonelayerrosemorerecentlywhendatafromsatellitesandgroundstationsshowedthatozonelevelsweredroppingoverareasotherthanAntarctica．LowozonelevelswererecordedinthespringandsummerovertheUnitedStatesandoverotherpopulatedareasintheworld．Althoughmanycountrieshavealreadybegunstoppingtheuseorozone—destroyingchemicals,thenewfindingsareexpectedtoadvancethetimetableforatotalbanofthechemicals．2．PollutionPeopletodayallovertheworldarebeginningtohearandlearnmoreandmoreabouttileproblemofpollution．Pollutioniscausedeitherbytherelease(排放)ofcompletelynewandoftenartificialsubstancesintotheenvironment,orbyreleasinggreatlyincreasedamountsofanaturalsubstance．suchasoilfromoiltankersintothesea．Withthedevelopmentofmodernindustry，manyofthegoodsandmachinesweneedanduseinourdailylivesarecreatinganumberofwasteproductswhichupsettheenvironmentbalance．Manyofthesewasteproductscanbepreventedifpeoplepaymoreattention，butclearlywhilemoreandmorenewgoods...
