中国名校英语四级密卷1

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1、中国名校英语四级密卷（1）PartⅡReadingComprehension(35minutes)Directions:Thereare4passagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheetwithasing

2、lelinethroughthecenter.PassageOneQuestions21to25arebasedonthefollowingpassage.Antarcticahasactuallybecomeakindofspacestation—auniqueobservationpostfordetectingimportantchangesintheworld’senvironment.S1Remotefrommajorsourcesofpollutionandthecomplexgeologicalandecologicalsystemstha

3、tprevailelsewhere,Antarcticamakespossiblescientificmeasurementsthatareoftensharperandeasiertointerpretthanthosemadeinotherpartsoftheworld.GrowingnumbersofscientiststhereforeseeAntarcticaasadistantearlywarningsensor,wherepotentiallydangerousglobaltrendsmaybespottedbeforetheyshowupt

4、othenorth.Onepromisingfieldofinvestigationisglaciology.ScholarsfromtheUnitedStates,Switzerland,andFrancearepursuingsevenseparatebutrelatedprojectsthatreflecttheirconcernforthehealthoftheWestAntarcticIceSheet—aconcerntheybelievetheworldatlargeshouldshare.TheTransantarcticMountain,so

5、meofthemmorethan14,000feethigh,dividethecontinentintotwoverydifferentregions.Thepartofthecontinenttothe“east”ofthemountainsisahighplateaucoveredbyanicesheetnearlytwomilesthick.“West”ofthemountain,thehalfofthecontinentsouthoftheAmericasisalsocoveredbyanicesheet,buttheretheicerestsonr

6、ockthatismostlywellbelowsealevel.IftheWestAntarcticIceSheetdisappeared,thewesternpartofthecontinentwouldbereducedtoasparseclusterofisland.Whileiceandsnowareobviouslycentraltomanyenvironmentalexperiments,othersfocusonthemysterious“dryvalley”ofAntarctica,valleysthatcontainlittleiceor

7、snoweveninthedepthsofwinter.SlashedthroughthemountainsofsouthernVictorialand,thesevalleysonceheldenormousglaciersthatdescend9,000feetfromthepolarplateautotheRossSea.Nowtheglaciersaregone,perhapsacasualtyoftheTheCarnegieFoundationreportsaysthatmanycollegeshavetriedtobe“allthingstoall

8、people”.Indoingso,t