高中英语 Unit4《Global Warming》学案5 新人教版选修6.doc

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1、Unit4GlobalWarmingGrammarLearningmaterialNSEFCBook6——Unit4LearningaimsEnablethestudentstomastertheusageoftheformitis/was...that.....LearningimportantpointsHowtoenablethestudentstoknowthestructureandtheusageoftheformitis/was...that....LearningdifficultpointsHowtohelpthest

2、udentstomastertheusageoftheformitis/was...that....Learningaidstaperecorder,slidesLearningproceduresStep1RevisionT:Firstlet’scheckanswers.(slideshow)Discoveringusefulwordsandexpressions.(P28)1.CharlesKeelingcollected______onthecarbondioxidecontentintheatmosphereoveraforty

3、-yearperiod.Hefoundthattheamountofcarbondioxide_______increasingduringthattime.2.Althoughweareburningcoalinhuge_________everyyear,wewon't________ofitforcenturies.3.Iftheamountofgreenhousegasescontinuesto_______wecouldbefacingaglobal__________.4.Manyscientistsbelievethatg

4、lobalwarminghas__________throughtheburningoffossilfuels.Theydonotthinkthatignoringtheissueisworththe____.5.______describesweatherconditionsoveraperiodofyearsinaparticularplace.6.The_____________ofarisingsealevelwouldbewidespreadflooding.7.TheuseofenergyinSusanna'scountry

5、islow______________theuseofenergyintheUSA.8.Thewarmingoftheearthisa_____________thatcausesgreatconcern.9.The________showstemperaturechangesduringthe20thcentury.10.Onehectareofforestcanabsorb23tonsofcarbondioxide____year.Keys：1.datakepton2.quantities;runout3.buildup;catas

6、trophe4.comeabout;risk5.Climate6.consequence7.comparedto8.phenomenon9.graph10.perAnswerkeysforEx.2onPage28:Thefirstgraphshowstheglobal_______________between________and_________Thetemperature__________anddecreasedoverthisperiodbutonthewholeit_________byaround_________andi

7、tshighestin2000.Therewasasteady_________________inthetemperatureduringthetwentyyearsafter1980.Wecanseefromthegraph4用心爱心专心thattheearthhasbecome___________sinceearlylastcentury.Thesecondgraphshowstheamountof______________intheatmospherefrom________to_______.Thecarbondioxid

8、e__________steadilyoverthisforty-yearperiod.Itwentupfrom315to370parts___________million.Keys：Temperatur