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1、大学英语课后作文答案(新世纪综合教程4)BOOK4Unit1MyUnderstandingofEnvironmentalProtectionManandtheenvironmentarecloselyrelated.Manreliesontheenvironmentforwater,foodandshelter.Aharmoniousrelationshipbetweenmanandtheenvironmentisessentialforhumansurvivalontheearth.However,manandtheenvironmenthaveneverbeen
2、onsuchbadtermsastheyarenow.Associetydevelops,man'stransformationofnaturehasseverelypollutedhislivingenvironment.Deforestationleadstochangesinrainfallpatterns,causingdevastatingfloods,droughtsandsandstorms.Thedischargeofchemicalpollutantsendangersourhealthandthelivesofotherbeings.Andmas
3、sproductionhasresultedintheshortageofirreplaceablenaturalresourcessuchascoalandoil.Ifwetakenoimmediateandeffectivestepstoprotectourenvironment,humanbeingsmaybethenextspeciestobecomeextinct.Weshoulddoourbesttoprotectourenvironmentbyplantingmoretrees,takingcareofwildlife,reducingindustri
4、alwastes,usingrenewableenergy,andimposingheavyfinesonenvironmentally-unfriendlyactivities,soastopreservetheenvironmentforfuturegenerations.Unit2TheImpactoftheMobilePhoneonPeople'sLivesAmongthemanytechnologicalinventions,themobilephoneimpressesmemost.Themobilephonebringsconsiderableconv
5、eniencetoourlives.Itnotonlyenablesustokeepintouchwitheachotheralmostanytimeandanywherebutalsohelpsussolveproblemsordobusinessefficiently.Inemergencies,amobilephonecanevenbealife-saver.Besides,itsmulti-functionsaddeaseandcolortoourlives.Withamobilephone,wecanreceivemail,readnews,listent
6、omusic,playgames,andtakepictures.Yet,themobilephonehasitsdisadvantages,too.Mostofushaveexperiencedthenuisanceofunwantedorwrongcalls.Weareinconveniencedbycallsonoccasionswhenweleastexpectone.Besides,thetechnologyinfrastructuretosupportmobilecommunicationhasconsumedvaluablenaturalresourc
7、esandcausedsignificantenvironmentalproblems.Itisreportedthatelectromagneticradiationwavesfromthephonemayresultinhealthproblems.Despiteitsnegativeside,theadvantagesofthemobilephoneoutweighitsdisadvantages.Ibelievethatwithadvancesinscienceandtechnology,improvedandsafermodelsofmobilepho
