方格信纸模版(打印空白模版手写完成).doc

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1、__________________________________________________考试科目： 学习形式：姓名：学号：收集于网络，如有侵权请联系管理员删除__________________________________________________收集于网络，如有侵权请联系管理员删除__________________________________________________收集于网络，如有侵权请联系管理员删除_____________________________________________

2、_____收集于网络，如有侵权请联系管理员删除__________________________________________________2019高考英语二轮阅读理解专练（详解）—科普知识Trafficlightsarekeytoolsforregulatingtrafficnow.Theyarenot,however,perfect.Driversexchangethetrafficjamsthatwouldhappenatunmanagedcrossingsforapatternofstopgomovementt

3、hatcanstillbeannoying,andwhichburnsmorefuelthanasmoothpassagewould.Creatingsuchasmoothpassagemeansadjustingavehicle'sspeedsothatitalwaysarrivesatthelightswhentheyaregreen.Thatistheoreticallypossible,butpracticallyhard.Roadsidesignswiredtotrafficlightscanhelpgettheme

4、ssageacrossacouplehundredmetresfromacrossing,butsuchsignsareexpensive,andarenotwidespread.MargaretMartonosiandEmmanouilKoukoumidisatPrincetonUniversity,andLiShiuanPehattheMassachusettsInstituteofTechnology,however,haveanideathatcouldmaketheprocesscheaperandmoreeffe

5、ctive.Insteadofahardwirednetworkofsigns,theyproposetousemobilephoneapplications.Foradrivertobenefit,hemustloadtheteam'ssoftware,namedSignalGuru,intohisphoneandthenputitonaspecialthingattachedtotheinsideofhiscar'swindscreen,withthecameralens(镜头)pointingforward.Signa

6、lGuruisdesignedtodetecttrafficlightsandtracktheirstatusasred,yelloworgreen.Itbroadcaststhisinformationtootherphonesintheareathatarefittedwiththesamesoftware,and—ifthereareenoughofthem,thephonesthuseachknowthestatusofmostofthelightsaroundtown.Usingthisinformation,Sig

7、nalGuruisabletocalculatethetrafficlightschedulefortheareaandsuggestthespeedatwhichadrivershouldtravelinordertoavoidredlights.TestsinCambridge,Massachusetts,wherefivedriverswereaskedtofollowthesamerouteforthreehours,andinSingapore,whereeightdriverswereaskedtofollowo

8、neoftworoutesfor30minutes,revealedthatSignalGuruwascapableofpredictingtrafficlightactivitywithanaccuracyof98.2%and96.3%respectively,inthe