高中英语（人教大纲）第二册上：unit9 saving the earth(第一课时)

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1、Unit9Savingtheearth1．BriefStatementsBased0ntheUnitInthisunit，Sswilldosomelisteningspeaking，readingandwritingpractice．Also,theywilllearntousetheInversion．Inthefirstperiod，Sswi1limprovetheirspeakingabilitybytalkingaboutnatureecologyandtheenvironmentandtheywilllist

2、entosomelisteningmaterialaboutourenvironment．Afterthestudyofthisperiod，theywillimprovetheirspeakingandlisteningabilitiesandalsoknowsomethingabouttheproblemsfacingtheearth．Inthesecondperiod，SswillreadapassageabouttheEarthSummit．FromthepassageSswillknowmoreaboutth

3、eimportanceofprotectingourearth．Inthethirdperiod．Sswillstudythegrammaritem：Inversion．Afterdoingsomeexercisesprovidedinthisperiod．andwiththehelpoftheteacher，SswillknowhowtousetheInversion．TeachermayprovidemoreexercisesforSstoconsolidateifnecessary．Inthelastperiod

4、，SswilllistentotwospeechesfromtheEarthSummitandfinishthepracticeprovidedinthefirstpart．SswillknowmoreabouttheEarthSummitandimprovetheirlisteningability．Inthewritingpart,Sswillimprovetheirwritingabilitybywritinganevaluationparagraphwiththehelpofsomegivenexpressio

5、ns．Afterthestudyofthisunit．Sswillknowhowtosupportanopinion，andtheywillknowmoreaboutenvironmentprotection．Theywillknowthatifallofusmakesmallchanges．wecouldmakeabigdifference．Theywilldomoretoprotectourearth．II．TeachingGoals1．Talkaboutnatureecologyandthe、environmen

6、t．2．Practisesupportinganopinion．3．Learntouseinversion．4．Writeanevaluationparagraph．III．Teachingtime：FiveperiodsIV．BackgroundInformation1．ProtectTheOzoneLayerInthemiddleofwinter，whensnowisfallinginmanypartsoftheUnitedStates,scientistshavesoundedawarningtopeoplewh

7、oplantospendmanyhoursinthesunthissummer．Thewarning：Thesun'ssummer-timeraysaremoredangerousthanoncethought．Ateamofscientistsfrom80nationsrecentlyreportedtotheUnitedNationsthatalayerofozoneintheatmosphere,whichprotectshumansfromharmfullevelsofultravioletradiation，

8、willbethinnerovertheUnitedStatesthissummer．Thethinner1ayerallowsmoreultravioletraysfromthesuntoreachtheearth．Theextraamountofultravioletradiationcouldcauseanincreasei