新课标考点规范练必修5Unit2

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1、丛挙主・考点规范练22（必修5Unit2）I」阅读理解1.AIhaveaguiltysecrettoadmit.MyplanewaspreparingfortakeofffromLondon'sHeathrowAirportinMarchwhenaflightattendantmadetheusualrequestforpassengerstoturntheirelectronicdevicesoff.Farfromobeyingjpushedmysmartphonedeeperintomypocket.ltseemsFmnotalone.Arecentsurveyfoundarou

2、ndfouroutoftenUSairpassengersadmittedtheydon'talwaysturntheirphonesoffonflights.Accordingtoregulations,theuseofportableelectronicdevicesisnotallowedbelowaround3,000m,evenin“flightmode：Abovethisheightdeviceslikelaptopsandmusicplayerscanbeused,butphonesmustremainoff.Theserulesareimportant,weareto

3、ld,toavoidpotentiallydangerousinterference（干扰）betweensignalsfromthesedevicesandsensitiveonboardelectronicsystems.Butdothesefearshaveanyscientificbasis,orisittimetorelaxtherules?ThefearofinterferencecomesfromthefactthatelectronicdevicesconnectitotheInternetortomobilephonenetworksusingradiowaves・

4、Whiledefiniteproof（证据）maybelacking,thereisplentyofevidencethattherisksshouldbetakenseriously.AreportsummaTising（概括）50casesofsafetyissuesthoughttohavebeencausedbypersonalelectronicdeviceswaspublishedinJanuary2014.A2006analysisofthedatabaseidentified125reportsofinterferencefromelectronicdevices.I

5、noneincidenta30-degreeerrorinnavigationequipmentwasimmediatelycorrectedwhenapassengerturnedoffaportableDVDplayer.Thisproblemreoccurredwhenthedevicewasswitchedbackon.RichardTaylor,aspokesmanoftheUK'sCivilAviationAuthority,believesitisjustamatteroftimebeforeweseemorewidespreaduseofmobiledeviceson

6、aircraft.“Whenregulatorslikeusareconvincedthatanaircraftcanbeusedsafelyevenwithportableelectronicdevicesbeingusedinthecabin5ofcoursetheruleswillberelaxed^hesaysfBulit'suptothemanufacturers,andofcoursetheairlines,toprovethattheycanoperatetheaircraftsafely：Perhapsthatdaymaycomesoon.However,having

7、learnthowdifficultitistoprovedefinitivelythatplanesaresafefrominterference.Fllbemakingsuremyphoneisproperlyswitchedoffinfuture.Whatwastheauthorsguiltysecret?A.Hemadeaphonecallontheplane.B.Hecarriedhismobilephoneontheplane.C.Hismob