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英语四级阅读全真试题英语四级阅读全真试题Unit1PassageOneThebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwithagun,butthemanwiththeportablecomputerinbusinessclass.Inthelast15years,pilotshavereportedwellover100incidentsthatcouldhavebeencausedbyelectromagneticinterference.Thesourceofthisinterferenceremainsunconfirmed,butincreasingly,expertsarepointingtheblameatportableelectronicdevicesuchasportablecomputers,radioandcassetteplayersandmobiletelephones.RTCA,anorganizationwhichadvisestheaviation(航空)industry,hasrecommendedthatallairlinesban(禁止)suchdevicesfrombeingusedduring“critical”stagesofflight,particularlytake-offandlanding.Someexpertshavegonefurther,callingforatotalbanduringallflights.Currently,rulesonusingthesedevicesareleftuptoindividualairlines.Andalthoughsomeairlinesprohibitpassengersfromusingsuchequipmentduringtake-offandlanding,mostarereluctanttoenforceatotalban,giventhatmanypassengerswanttoworkduringflights.Thedifficultyispredictinghowelectromagneticfieldsmightaffectanaircraft‘scomputers.Expertsknowthatportabledeviceemitradiationwhichaffectsthosewavelengthswhichaircraftusefornavigationandcommunication.But,becausetheyhavenotbeenabletoreproducetheseeffectsinalaboratory,theyhavenowayofknowingwhethertheinterferencemightbedangerousornot.Thefactthataircraftmaybevulnerable(易受损的)tointerferenceraisestheriskthatterroristsmayuseradiosystemsinordertodamagenavigationequipment.Asworrying,though,isthepassengerwhocan‘theartheinstructionstoturnoffhisradiobecausethemusic‘stooloud.21.Thepassageismainlyabout________.A)anewregulationforalairlinesB)thedefectsofelectronicdevicesC)apossiblecauseofaircraftcrashesD)effectivesafetymeasuresforairflight22.Whatissaidabouttheover100aircraftincidentsinthepast15years?A)Theymayhavebeencausedbythedamagetotheradiosystems.B)Theymayhavetakenplaceduringtake-offandlanding.C)Theywereprovedtohavebeencausedbythepassengersportablecomputers.D)Theyweresuspectedtohaveresultedfromelectromagneticinterference.23.Fewairlineswanttoimposeatotalbanontheirpassengersusingelectr
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