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1、nQuestions1to5arebasedonthefollowingpassage.nElectriccarsaredirty.Infact,notonlyaretheydirty,theymightevenbemoredirtythantheirgasoline-poweredcousins.nPeopleinCalifornialovetotalkabout“zero-emissionsvehicles,”butpeopleinCaliforniaseemtobecluelessaboutwhereelectricitycomesfrom.Powerplantsmosta
2、llusefiretomakeit.Asidefromthefewfolkswhohavetheirroofscoveredwithsolarcells,wegetourelectricityfromgenerators.Generatorsarefueledbysomething—usuallycoal,oil,butalsobyheatgeneratedinnuclearpowerplants.Thereareafewwindfarmsandgeothermal（地热的）plantsaswell,butbyfarwegetelectricitymainlybyburnings
3、omething.nInotherwords,those“zero-emissions”carsarelikelycoal-burningcars.It'sjustthecoalisburnedsomewhereelsesoitlooksclean.Itisnot.It’sasiftheCaliforniaGreensarecoveringtheireyes—“IfIcan’tseeit,it’snothappening.”Gasolineisanincrediblyefficientwaytopoweravehicle;agallonofgashasalotofenergyin
4、it.Butwhenyoutakethatgas(oranotherfuel)andfirstuseittomakeelectricity,youwasteanicepartofthatenergy,mostlyintheformofwastedheat—atthegenerator,throughthetransmissionlines,etc.nAgallonofgasmaypropelyourcar25miles.Buttheelectricityyougetfromthatgallonofgaswon‘tgetyounearlyasfar—soelectriccarsbu
5、rnmorefuelthangas-poweredones.Ifourelectricitycamemostlyfromnukes（核能发电厂，核武器）,orgeothermal,orhydro（水电）,orsolar,orwind,thenanelectriccartrulywouldbeclean.Butforpolitical,technical,andeconomicreasons,wedon’tusemuchofthoseenergysources.nInaddition,electriccars’batterieswhicharepoisonousforalongti
6、mewilleventuallyendupinalandfill.Andfinally,whencarsarethepolluters,thepollutionisspreadacrossalltheroads.Whenit’sapowerplant,though,allthejunkisinoneplace.Natureisverygoodatcleaningupwhenthingsarenottooconcentrated,butittakesalotlongerwhenallthegarbageisinonespot.n1.Whatdoes“clueless”meaninp
7、aragraph2?nA)TheCaliforniaGreensarecoveringtheireyes.nB)PeopleinCalifornialovetotalkaboutzero-emissionsvehiclesnC)PeopleinCalifornialovetohavetheirroofscoveredwithsolarcellsnD)Peopletherehavenoideathatsofarelectricitymainlycomesfromburningcoa
