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1、大学英语第二册Unit8ProtectingourEnvironmentHomework：PreviewtextAReadthenewwordsandphrasesbeforeclass,thenreadthetextindetailandsurftheinternettofulfillthefollowingtasks.1-Makethetitle,SavingEarth,butOnlyforMan,intoacompletesentence.Suggestedanswer:Wemustprotecttheearth
2、senvironmentsothatitcanbettersavehumanbeings.2.Whatisasensibleenvironmentalism?Suggestedanswer:Asensibleenvironmentalism,theonlykindofenvironmentalismthatwillwinuniversalpublicsupport,beginsbyunashamedlydeclaringthatnatureisherotoserveman.Asensibleenvironmentali
3、smisentirelyman-centered:itcallsformantopreservenature,butonthegroundsofself-preservation,(inPara5)(DetailedexplanationcanbefoundinParas2,6,8,14)3.Asforsensibleenvironmentalism,what^syourcomment?Suggestedanswer:Ithinkitisreally"sensible"sincebothhumansandenviron
4、mentaretakenintoconsiderationinthesuggestedpracticesofit.But,sometimesitisdifficulttoachieveabalancebetweenmanandnature.Forexample,inparall,itisrecommendedthatthecostofpreservingthespottedowlisnotsupposedtothelossoflivelihoodfor30,000loggingfamilies.Sensibleenvi
5、ronmentalismisstillnotaperfectsolution,sinceanalternativehastobemade.4.Surftheinternettofindouthowourenvironmentispolluted.Suggestedanswer:airpollution,waterpollution,soilpollutionAirpollutionistheaccumulationintheatmosphereofsubstancesthat,insufficientconcentra
6、tions,endangerhumanhealthorproduceothermeasuredeffectsonlivingmatterandothermaterials.Amongthemajorsourcesofpollutionarepowerandheatgeneration,theburningofsolidwastes,industrialprocesses,and,especially,transportation.Thesixmajortypesofpollutantsarecarbonmonoxide
7、,hydrocarbons,nitrogenoxides,particulates,sulfurdioxide,andphotochemicaloxidants.Waterpollutionistheintroductionintofreshoroceanwatersofchemical,physical,orbiologicalmaterialthatdegradesthequalityofthewaterandaffectstheorganismslivinginit.Thisprocessrangesfromsi
8、mpleadditionofdissolvedorsuspendedsolidstodischargeofthemostinsidiousandpersistenttoxicpollutants(suchaspesticides,heavymetals,andnondegradable,bioaccumulative,chemic
