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III.部分练习讲解P305BridgingtheGapDirections:Fillintheblankswithawordoraphrasethatbestcompletesthepassage.Youmaychooseasuitableonefromthelistgiven.解题方法：把词分类 动词 形容词 代词/限定词comparedto low anotherrequire personalrunningoutof economicrefersto positive limitedOftenreferredtoasgreentransport,sustainabletransportationisthewayofthefuture.Transportpoweredbygasandpetrolisrunningona1limitedtimeframe（时间范围，期限）,asboththesesourcesareunsustainableinthelongrun.Incontrast,sustainabletransportationoffersanoptiontoaworldrapidly2runningoutofrenewable（可再生的）fuelsources.It3referstoanykindoftransportthathasalowimpactontheenvironment,suchaswalking,cycling,masstransit,greenvehicles,andcarpooling（集体用车，拼车）,amongstothers.Anymodeoftransportisdeemedsustainableifithasa4lowenvironmentalimpactanduseslittleornofuel.Walkingisthebestexampleofsustainabletransportation,asitdoesnot5requireanygas.However,walkingcanbeimpracticalifyouaretravellinglongerdistances.Cyclingis6anothergreentransportoptionandisafarmorepracticaloptionforlongercommutes.Usingpublictransportation,suchasbusesortrains,isalsomoresustainable7comparedtoprivatevehicles.Theamountoffuelusedtotransportabusfullofpeopleismoreeffectivecomparedtoasinglepersondrivinga8personalcar.Asustainabletransportsystemhasa9positiveimpactontheenvironment,andhelpstopromotesocialand10economicsustainability（可持续性）inthecommunitiesitserves.Increasedmobilityusuallyresultsinbettersocio-economicconditions: