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1、2010年6月大学英语四级考试真题PartⅣReadingComprehension(ReadinginDepth)SectionBDirections:Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletteronAnswerSheet2with
2、asinglelinethroughthecentre.PassageOneQuestions57to61arebasedonthefollowingpassage.Youneverseethem,butthey'rewithyoueverytimeyoufly.Theyrecordwhereyou'regoing,howfastyou'retravelingandwhethereverythingonyourairplaneisfunctioningnormally.Theirabilitytowithstandalmostanydisastermakesthemseemlikeso
3、methingoutofacomicbook.They'reknownastheblackbox.Whenplanesfallfromthesky,asaYemeniairlinerdidonitswaytotheComorosIslandsintheIndianOceanJune30,2009,theblackboxisthebestbetforidentifyingwhatwentwrong.SowhenaFrenchsubmarine(潜水艇)detectedthedevice'shomingsignalfivedayslater,thediscoverymarkedahuges
4、teptowarddeterminingthecauseofatragedyinwhich152passengerswerekilled.In1958,AustralianscientistDavidWarrendevelopedaflight-memoryrecorderthatwouldtrackbasicinformationlikealtitudeanddirection.Thatwasthefirstmodelforablackbox,whichbecamearequirementonallUScommercialflightsby1960.Earlymodelsoftenf
5、ailedtowithstandcrashes,however,soin1965thedevicewascompletelyredesignedandmovedtotherearoftheplane—thearealeastsubjecttoimpact—fromitsoriginalpositioninthelandingwells(起落架舱).Thatsameyear,theFederalAviationAuthorityrequiredthattheboxes,whichwereneveractuallyblack,bepaintedorangeoryellowtoaidvisi
6、bility.Modernairplaneshavetwoblackboxes:avoicerecorder,whichtrackspilots'conversations,andaflight-datarecorder,whichmonitorsfuellevels,enginenoisesandotheroperatingfunctionsthathelpinvestigatorsreconstructtheaircraft'sfinalmoments.Placedinaninsulated(隔绝的)caseandsurroundedbyquarter-inch-thickpane
7、lsofstainlesssteel,theboxescanwithstandmassiveforceandtemperaturesupto2000°F.Whensubmerged,they'realsoabletoemitsignalsfromdepthsof20000ft.ExpertsbelievetheboxesfromAirFranceFlight447,whichcrashednearBrazilonJune1,2009,arein
