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1、Unit3Scienceversusnature一、阅读理解。Pollution’sgreateffectsontheenvironmenthavebecomemoreobviousinrecentyears,leadingtoamovementtopromoteenergyefficiency（效率）,lessrelianceonfossil（化石)fuels,andareductioninairandwaterpollution.Mostscientistsagreethatsuchchangesarenecessarytoprotectourenvironmentfromfur
2、therharm.Theconstructionindustryconsumesalargequantityofenergyandresourcesandcreatesahugeamountofpollution.IntheUnitedStates,buildinganddevelopmentaccountfor39%ofthecountry’stotalenergyuse,12%oftotalwaterconsumption,68%oftotalelectricityconsumptionand38%ofcarbondioxideemissions（二氧化碳排放）,accordin
3、gtotheEnvironmentProtectionAgency.Greenbuildingsuselessenergy,water,createlesswaste,andarehealthiertolive,work,andgotoschoolinthanstandardbuildings.Buildersofgreenbuildingsusetechniquesthatuseresourcesmoreefficientlyduringtheentirebuildingcycle—construction,restoration,operation,maintenance（维护）
4、anddemolition（拆毁）—thanthosewhoconstructmoreregularbuildings.Theenvironmentalbenefitsofbuildinggreenincludetheprotectionofecosystems（生态系统）andbiodiversity,improvedairandwaterquality,lesswasteflowingintostreams,andtheprotectionofnaturalresources.Greenbuildingscanalsoresultinloweroperatingcostsbeca
5、usetheytypicallyuselessenergyandfewermaterialsandimproveindoorairquality,improvingthehealthofpeoplewholiveinsuchbuildings.Theprocessofbuildinggreenincludestechnicalandartisticplanningwithnatureprotectioninmind.Buildingdesignsoftenreflectthesurroundingenvironmentandnaturalresourcesanduserenewabl
6、ebuildingmaterialssuchasbambooandstraw.Inaddition,recycledresourcesfoundlocallyareusedforgreenbuildings,reducingthecostandairpollutionassociatedwithtransportingmaterialsoverlongdistances.Carefulsiteselectionisimportanttominimize（最小化）humanimpactonthesurroundingenvironment.Forexample,placingastru
7、ctureinanareathatallowsittotakeadvantageofcoolbreezes（微风）andsunlightcanreduceenergyuseandexpenses.Moreenergyandexpenseareneededforlargerbuildingsaswell,soitisimportanttobuildsmall.Greenroofsareanotherfeatureofgreenhousesthatreduce
