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1、CET4阅读通关班电子教材主讲:陈科欢迎使用新东方在线电子教材教材说明:本电子教材word文档下面的页码跟教材完全一样,学员只需根据老师说的多少页找到相应的页面学习即可。请提前预习、认真学习、及时复习,祝广大学子考试取得成功!136第一部分阅读理解全真试题Unit1PartIIReadingComprehension(35minutes)Directions:Thereare4passagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstat
2、ements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheetwithasinglelinethroughthecenter.PassageOneQuestions21to25arebasedonthefollowingpassage.Thebiggestsafetythreatfacingairlinestoda
3、ymaynotbeaterroristwithagun,butthemanwiththeportablecomputerinbusinessclass.Inthelast15years,pilotshavereportedwellover100incidentsthatcouldhavebeencausedbyelectromagneticinterference.Thesourceofthisinterferenceremainsunconfirmed,butincreasingly,expertsarepoint
4、ingtheblameatportableelectronicdevicesuchasportablecomputers,radioandcassetteplayersandmobiletelephones.RTCA,anorganizationwhichadvisestheaviation(航空)industry,hasrecommendedthatallairlinesban(禁止)suchdevicesfrombeingusedduring“critical”stagesofflight,particularl
5、ytake-offandlanding.Someexpertshavegonefurther,callingforatotalbanduringallflights.Currently,rulesonusingthesedevicesareleftuptoindividualairlines.Andalthoughsomeairlinesprohibitpassengersfromusingsuchequipmentduringtake-offandlanding,mostarereluctanttoenforcea
6、totalban,giventhatmanypassengerswanttoworkduringflights.Thedifficultyispredictinghowelectromagneticfieldsmightaffectanaircraft’scomputers.Expertsknowthatportabledeviceemitradiationwhichaffectsthosewavelengthswhichaircraftusefornavigationandcommunication.But,bec
7、ausetheyhavenotbeenabletoreproducetheseeffectsinalaboratory,theyhavenowayofknowingwhethertheinterferencemightbedangerousornot.Thefactthataircraftmaybevulnerable(易受损的)tointerferenceraisestheriskthatterroristsmayuseradiosystemsinordertodamagenavigationequipment.A
8、sworrying,though,isthepassengerwhocan’theartheinstructionstoturnoffhisradiobecausethemusic’stooloud.21.Thepassageismainlyabout________.136A)anewregulationforalairlinesB)thed