新课标.考点规范练.必修5 Unit2.doc

《新课标.考点规范练.必修5 Unit2.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、考点规范练22(必修5　Unit2)Ⅰ.阅读理解1.AIhaveaguiltysecrettoadmit.MyplanewaspreparingfortakeofffromLondon’sHeathrowAirportinMarchwhenaflightattendantmadetheusualrequestforpassengerstoturntheirelectronicdevicesoff.Farfromobeying,Ipushedmysmartphonedeeperintomypocket.ItseemsI’mnotalone.Arecentsurveyfo

2、undaroundfouroutoftenUSairpassengersadmittedtheydon’talwaysturntheirphonesoffonflights.Accordingtoregulations,theuseofportableelectronicdevicesisnotallowedbelowaround3,000m,evenin“flightmode”.Abovethisheightdeviceslikelaptopsandmusicplayerscanbeused,butphonesmustremainoff.Theserulesarei

3、mportant,wearetold,toavoidpotentiallydangerousinterference(干扰)betweensignalsfromthesedevicesandsensitiveonboardelectronicsystems.Butdothesefearshaveanyscientificbasis,orisittimetorelaxtherules?ThefearofinterferencecomesfromthefactthatelectronicdevicesconnecttotheInternetortomobilephonen

4、etworksusingradiowaves.Whiledefiniteproof(证据)maybelacking,thereisplentyofevidencethattherisksshouldbetakenseriously.Areportsummarising(概括)50casesofsafetyissuesthoughttohavebeencausedbypersonalelectronicdeviceswaspublishedinJanuary2014.A2006analysisofthedatabaseidentified125reportsofinte

5、rferencefromelectronicdevices.Inoneincidenta30-degreeerrorinnavigationequipmentwasimmediatelycorrectedwhenapassengerturnedoffaportableDVDplayer.Thisproblemreoccurredwhenthedevicewasswitchedbackon.RichardTaylor,aspokesmanoftheUK’sCivilAviationAuthority,believesitisjustamatteroftimebefore

6、weseemorewidespreaduseofmobiledevicesonaircraft.“Whenregulatorslikeusareconvincedthatanaircraftcanbeusedsafelyevenwithportableelectronicdevicesbeingusedinthecabin,ofcoursetheruleswillberelaxed,”hesays.“Butit’suptothemanufacturers,andofcoursetheairlines,toprovethattheycanoperatetheaircra

7、ftsafely.”Perhapsthatdaymaycomesoon.However,havinglearnthowdifficultitistoprovedefinitivelythatplanesaresafefrominterference.I’llbemakingsuremyphoneisproperlyswitchedoffinfuture.Whatwastheauthor’sguiltysecret?A.Hemadeaphonecallontheplane.B.Hecarriedhismobilephoneontheplane.C.Hi