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1、Unit3Scienceversusnature一、阅读理解。Pollution’sgreateffectsontheenvironmenthavebecomemoreobviousinrecentyears,leadingtoamovementtopromoteenergyefficiency（效率）,lessrelianceonfossil（化石)fuels,andareductioninairandwaterpollution.Mostscientistsagreethatsuchchangesarenecessarytoprotectourenvironmentfr
2、omfurtherharm.Theconstructionindustryconsumesalargequantityofenergyandresourcesandcreatesahugeamountofpollution.IntheUnitedStates,buildinganddevelopmentaccountfor39%ofthecountry’stotalenergyuse,12%oftotalwaterconsumption,68%oftotalelectricityconsumptionand38%ofcarbondioxideemissions（二氧化碳排放
3、）,accordingtotheEnvironmentProtectionAgency.Greenbuildingsuselessenergy,water,createlesswaste,andarehealthiertolive,work,andgotoschoolinthanstandardbuildings.Buildersofgreenbuildingsusetechniquesthatuseresourcesmoreefficientlyduringtheentirebuildingcycle—construction,restoration,operation,
4、maintenance（维护）anddemolition（拆毁）—thanthosewhoconstructmoreregularbuildings.Theenvironmentalbenefitsofbuildinggreenincludetheprotectionofecosystems（生态系统）andbiodiversity,improvedairandwaterquality,lesswasteflowingintostreams,andtheprotectionofnaturalresources.Greenbuildingscanalsoresultinlow
5、eroperatingcostsbecausetheytypicallyuselessenergyandfewermaterialsandimproveindoorairquality,improvingthehealthofpeoplewholiveinsuchbuildings.Theprocessofbuildinggreenincludestechnicalandartisticplanningwithnatureprotectioninmind.Buildingdesignsoftenreflectthesurroundingenvironmentandnatur
6、alresourcesanduserenewablebuildingmaterialssuchasbambooandstraw.Inaddition,recycledresourcesfoundlocallyareusedforgreenbuildings,reducingthecostandairpollutionassociatedwithtransportingmaterialsoverlongdistances.Carefulsiteselectionisimportanttominimize（最小化）humanimpactonthesurroundingenvir
7、onment.Forexample,placingastructureinanareathatallowsittotakeadvantageofcoolbreezes（微风）andsunlightcanreduceenergyuseandexpenses.Moreenergyandexpenseareneededforlargerbuildingsaswell,soitisimportanttobuildsmall.Greenroofsareanotherfeatureofgreenhousesthatreduce
