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1、Unit3Scienceversusnature一、阅读理解。Pollution’sgreateffectsontheenvironmenthavebecomemoreobviousinrecentyears,leadingtoamovementtopromoteenergyefficiency（效率）,lessrelianceonfossil（化石)fuels,andareductioninairandwaterpollution.Mostscientistsagreethatsuchchangesarenecessarytoprote
2、ctourenvironmentfromfurtherharm.Theconstructionindustryconsumesalargequantityofenergyandresourcesandcreatesahugeamountofpollution.IntheUnitedStates,buildinganddevelopmentaccountfor39%ofthecountry’stotalenergyuse,12%oftotalwaterconsumption,68%oftotalelectricityconsumptiona
3、nd38%ofcarbondioxideemissions（二氧化碳排放）,accordingtotheEnvironmentProtectionAgency.Greenbuildingsuselessenergy,water,createlesswaste,andarehealthiertolive,work,andgotoschoolinthanstandardbuildings.Buildersofgreenbuildingsusetechniquesthatuseresourcesmoreefficientlyduringthee
4、ntirebuildingcycle—construction,restoration,operation,maintenance（维护）anddemolition（拆毁）—thanthosewhoconstructmoreregularbuildings.Theenvironmentalbenefitsofbuildinggreenincludetheprotectionofecosystems（生态系统）andbiodiversity,improvedairandwaterquality,lesswasteflowingintostr
5、eams,andtheprotectionofnaturalresources.Greenbuildingscanalsoresultinloweroperatingcostsbecausetheytypicallyuselessenergyandfewermaterialsandimproveindoorairquality,improvingthehealthofpeoplewholiveinsuchbuildings.Theprocessofbuildinggreenincludestechnicalandartisticplann
6、ingwithnatureprotectioninmind.Buildingdesignsoftenreflectthesurroundingenvironmentandnaturalresourcesanduserenewablebuildingmaterialssuchasbambooandstraw.Inaddition,recycledresourcesfoundlocallyareusedforgreenbuildings,reducingthecostandairpollutionassociatedwithtransport
7、ingmaterialsoverlongdistances.Carefulsiteselectionisimportanttominimize（最小化）humanimpactonthesurroundingenvironment.Forexample,placingastructureinanareathatallowsittotakeadvantageofcoolbreezes（微风）andsunlightcanreduceenergyuseand13expenses.Moreenergyandexpenseareneededforla
8、rgerbuildingsaswell,soitisimportanttobuildsmall.Greenroofsareanotherfeatureofgreenhousesthatredu
