小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第四册UNIT12INNOVATION(一)Ⅰ.阅读理解A(★)(2022·全乙，国C)Canasmallgroupofdrones(无人机)guaranteethesafetyandreliabilityofrailwaysand，atthesametime，helprailwayoperatorssavebillionsofeuroseachyear？Thatistheverylikelyfutureofapplyingtoday’s“eyesinthesky”technologytomakingsurethatthemillionsofkilometresofrailtracksandinfrastructure(基础设施)worldwidearesafefortrainsona24/7basis.Dronesarealreadybeingusedtoexaminehigh-tensionelectricallines.Theycoulddopreciselythesamethingtoinspectrailwaylinesandothervitalaspectsofrailinfrastructuresuchasthecorrectpositionofrailwaytracksandswitchingpoints.Themoreregularlytheycanbeinspected，themorerailwaysafety，reliabilityandon-timeperformancewillbeimproved.Costswouldbecutandoperationswouldbemoreefficient(高效)acrosstheboard.Thatincludeshugesavingsinmaintenancecostsandbetterprotectionofrailwaypersonnelsafety.ItiscalculatedthatEuropeanrailwaysalonespendapproximately20billioneurosayearonmaintenance，includingsendingmaintenancestaff，oftenatnight，toinspectandrepairtherailinfrastructure.Thatcanbedangerousworkthatcouldbeavoidedwithdronesassistingthecrews’efforts.Byusingthelatesttechnologies，dronescouldalsostartprovidinghigher-valueservicesforrailways，detectingfaultsintherailorswitches，beforetheycancauseanysafetyproblems.Toperformthesetasks，dronesforraildon’tneedtobeflyingoverhead.Engineersarenowworkingonanewconcept：theraildronesofthefuture.Theywillbemovingonthetrackaheadofthetrain，andprogrammedtorunautonomously.VerysmalldroneswithadvancedsensorsandAIandtravellingaheadofthetraincouldguideitlikeaco-pilot.Withtheirabilitytoseeahead，theycouldsignalanyproblem，sothatfast-movingtrainswouldbeabletoreactintime.1．Whatmakestheapplicationofdronestoraillinespossible?A．Theuseofdronesincheckingonpowerlines.B．Drones’abilitytoworkathighaltitudes.C．Thereductionofcostindesigningdrones.D．Drones’reliableperformanceinremoteareas.2．Whatdoes“maintenance”underlinedinparagraph3referto?A．Personnelsafety.B．Assistancefromdrones.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comC．Inspectionandrepair.D．Constructionofinfrastructure.3．Whatfunctionisexpectedoftheraildrones?A．Toprovideearlywarning.B．Tomaketrainsrunautomatically.C．Toearnprofitsforthecrews.D．Toacceleratetransportation.4．Whichisthemostsuitabletitleforthetext?A．WhatFaultsCanBeDetectedwithDronesB．HowProductionofDronesCanBeExpandedC．WhatDifficultyDroneDevelopmentWillFaceD．HowDronesWillChangetheFutureofRailwaysBTimothywasexhaustedforheworkedextendedhours.Althoughearningalowwageandhandlingill-manneredcustomers，healwaysputservingthosewhosatathistableswellonthefrontburnerofhismind.Hewentabouthisdailydutiescarefully，puttingonasmilingfaceascustomerscomplainedaboutthefoodorquestionedthebill.Usuallyasnightdeepenedpreparingtoclosethebusiness，hewouldnoticeacoupleofcustomerswalkin，sitdownandorderdrinks.Mostofthecrewhadleftbyclosingtime，butTimothystayedtoserve.Eventually，thelastroundwasorderedandhegavethemthebill.Theminimumtipwassuggestedonthereceipt.“Tomorrowwillbebetter，”hemurmured.Butluckwouldn’talwayssmileonhim.Eveningapproaching，agrou...