实用科技英语教程 第3版 教学课件 作者 盛楠 Unit 4.ppt

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1、Unit4TheEnvironmentLet’sseewhatkindofenvironmentwelive…PollutionDoyouknowothertypesofpollutioninourlifeWaterpollutionAirpollutionWastepollutionNoisepollutionNuclearpollutionElectromagneticradiationLightpollutionIndoorairpollutionSoilpollutionGeneticpollutionpollutionTask1:Lookatthepictureinthetext

2、bookandcompletethesentences.PollutionScenarioWeshouldstoptreatingtheseaandriversasadumpforhumanandindustrialeffluent.Someanimalshavelosttheirwoodlandhabitatsasaresultofdeforestation.Gasesfromindustrialandcarexhaustscancauseacidrainwhichisharmfultoplantsandtrees.Findingsomewheretoputtherubbishisbec

3、omingharderandmoreexpensive.Nowonderthatrichcountrygovernmentsincreasinglythinkwastedisposalastheirmostpressingenvironmentalproblem.Welivesurroundedbyloudplanes,trucksandelectrictools.Thesesoundsareloudenoughtocausegreatharmtopeople'shearing.Theeffectmobilephoneradiationhasonhumanhealthisthesubjec

4、tofrecentinterestandstudy,asaresultoftheenormousincreaseinmobilephoneusagethroughouttheworld.TheKeyTask2:VocabularyCompleteWordPuzzlebelowusingthewordsyou’vejustdiscussed.WordPuzzleTHREATSEFFLUENEXAUSTSADIATIONNOISWSTEDEFORESATIONLANDLIDETask3:Discusswithyourclassmatesthecausesandeffectsofeachtype

5、ofpollution.TypesofpollutionCausesEffects1.Waterpollution2.Airpollution3.Wastepollution4.Noicepollution5.Radiationenormousincreaseinmobilephoneusagegreatharmtopeople'shearingacidrainlowvisibilitygasesfromfactoriesandcarexhaustsemissionofhumanandindustrialeffluentseaandriversbecomesadumpharmtohuman

6、healthLoudnoisefromplanes,trucksandelectrictoolsrubbishanywheregreatharmtopeople’shealthCause-and-EffectSignalsClassifyfollowingCause-and-EffectSignals,andfindmore.(P54)duetosothereforebecauseresultcauseconsequentlycontributorleadtoCauses(原因)Effects(结果)dueto(conj.)because/becauseof(conj.)resultfro

7、m(v.)so,therefore(conj.)resultin(v.-phrase)leadto(v.-phrase)cause(v.-phrase)consequently(adv.)result,cause,contributor(n.)owingto(conj.)inthat(conj.)asaresultof(conj.)attributeto(v.-phrase)beattributableto(a.-phr