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2025北京初三二模英语汇编
阅读单选CD篇
一、阅读理解
（2025北京海淀初三二模）
Ina2015sci-fimovie,“Madscientist”DoctorBrownbroughtwide-eyedteenagerMartytothefutureinstyle:aboardaflyingcar.Now,10yearshavepassedandtherearestillnoflyingcars.Butthetechnologytomakeflyingcarsalreadyexists,saysXiaosongDu,anaerospaceengineeratMissouriUniversity.
Areal-worldflyingcarwouldmostlikelybeacrossbetweenanairplaneandahelicopter.Airplanesneedrunways,soitwouldbemorepracticalforaflyingcartotakeoffvertically(垂直地)likeahelicopter.Propellers(螺旋桨)wouldproducelifttobringthecarofftheground.“Onceit’scompletedtakeoff,”Dusays,“itcanflylikeanormalairplane.”Airplanewingswouldcomeoutfromthebodyofthecar,allowingforflightwithlessairfriction(空气摩擦力)thanahelicopterdoes.
Anotherchoiceistofixpropellerstoaflyingcar’swings.Atfirst,thewingswouldbetilted(倾斜)upward,sothatthepropellerscouldliftthecar.Onceittakesoff,thewingswouldtilttolayflat,likethoseonanairplane,saysaerospaceengineerPatAnderson,formerdirectoroftheEagleFlightResearchCenter.“It’slikeaTransformer.”
Oneofthebiggestchallengestopeoplecommutinginflyingcarsisexpense.TheU.S.companyAlefAeronautics,forinstance,planstosellpersonalcarsthatcandriveonroadsandtakeoffintotheskies.Thesecarslookandfunctionsimilarlytothoseinmanysci-fimovies,butcomewithahighprice.Whentheygointoproductionsometimethisyear,thecarsareexpectedtocostabout$300,000each.
Forpeoplewithlesstospend,arideshareserviceforflyingcars—somethingliketaxisfortheskies—maybeabetterchoice.Flyingtaxismaybecomecommonin10or20years,Andersonpredicts.Flyingcarsneedtobetestedoverandoverforsafety.Besides,rulesshouldbecreatedforthem.
Flyingalsotakesalotofpower,especiallyduringtakeoff.Therechargeablebatter