高二英语选修6 unit 4教案4.doc

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教案4人教选修6Unit4GlobalWarming
Grammar
Teachingmaterial
NSEFCBook6——Unit4
Teachingaims
Enablethestudentstomastertheusageoftheformitis/was...that.....
Teachingimportantpoints
Howtoenablethestudentstoknowthestructureandtheusageoftheformitis/was...that....
Teachingdifficultpoints
Howtohelpthestudentstomastertheusageoftheformitis/was...that....
Teachingaids
taperecorder,slides
Teachingprocedures
Step1Revision
T:Firstlet’scheckanswers.(slideshow)
Discoveringusefulwordsandexpressions.(P28)
1.CharlesKeelingcollected______onthecarbondioxidecontentintheatmosphereoveraforty-yearperiod.Hefoundthattheamountofcarbondioxide_______increasingduringthattime.
2.Althoughweareburningcoalinhuge_________everyyear,wewon't________ofitforcenturies.
3.Iftheamountofgreenhousegasescontinuesto_______wecouldbefacingaglobal__________.
4.Manyscientistsbelievethatglobalwarminghas__________throughtheburningoffossilfuels.Theydonotthinkthatignoringtheissueisworththe____.
5.______describesweatherconditionsoveraperiodofyearsinaparticularplace.
6.The_____________ofarisingsealevelwouldbewidespreadflooding.
7.TheuseofenergyinSusanna'scountryislow______________theuseofenergyintheUSA.
8.Thewarmingoftheearthisa_____________thatcausesgreatconcern.
9.The________showstemperaturechangesduringthe20thcentury.
10.Onehectareofforestcanabsorb23tonsofcarbondioxide____year.
Keys：1.datakepton2.quantities;runout3.buildup;catastrophe
4.comeabout;risk5.Climate6.consequence7.comparedto8.phenomenon
9.graph10.per
AnswerkeysforEx.2onPage28:
Thefirstgraphshowstheglobal_______________between________and_________Thetemperature__________anddecreasedoverthisperiodbutonthewholeit_________byaround_________anditshighestin2000.Therewasasteady_________________inthetemperatureduringthetwentyyearsafter1980.Wecanseefromthegraphthattheearthhasbecome___________sinceearlylastcentury.
Thesecondgraphshowstheamountof______________intheatmospherefrom________to_______.Thecarbondioxide__________steadilyoverthisforty-yearperiod.Itwentupfrom315