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1、EnglishExaminationPaperPartIReadingComprehensionPassageOneAntarcticahasactuallybecomeakindofspacestation—auniqueobservationpostfordetectingimportantchangesintheworld’senvironment.S1Remotefrommajorsourcesofpollutionandthecomplexgeologicalandecologicalsystemsthatprevailelsewhere,Antarcticamakesposs
2、iblescientificmeasurementsthatareoftensharperandeasiertointerpretthanthosemadeinotherpartsoftheworld.GrowingnumbersofscientiststhereforeseeAntarcticaasadistantearlywarningsensor,wherepotentiallydangerousglobaltrendsmaybespottedbeforetheyshowuptothenorth.Onepromisingfieldofinvestigationisglaciology
3、.ScholarsfromtheUnitedStates,Switzerland,andFrancearepursuingsevenseparatebutrelatedprojectsthatreflecttheirconcernforthehealthoftheWestAntarcticIceSheet—aconcerntheybelievetheworldatlargeshouldshare.TheTransantarcticMountain,someofthemmorethan14,000feethigh,dividethecontinentintotwoverydifferentr
4、egions.Thepartofthecontinenttothe“east”ofthemountainsisahighplateaucoveredbyanicesheetnearlytwomilesthick.“West”ofthemountain,thehalfofthecontinentsouthoftheAmericasisalsocoveredbyanicesheet,buttheretheicerestsonrockthatismostlywellbelowsealevel.IftheWestAntarcticIceSheetdisappeared,thewesternparto
5、fthecontinentwouldbereducedtoasparseclusterofisland.Whileiceandsnowareobviouslycentraltomanyenvironmentalexperiments,othersfocusonthemysterious“dryvalley”ofAntarctica,valleysthatcontainlittleiceorsnoweveninthedepthsofwinter.SlashedthroughthemountainsofsouthernVictorialand,thesevalleysonceheldenorm
6、ousglaciersthatdescend9,000feetfromthepolarplateautotheRossSea.Nowtheglaciersaregone,perhapsacasualtyoftheglobalwarmingtrendduringthe10,000yearssincetheiceage.Eventhesnowthatfallsinthedryvalleysisblastedoutbyviciouswindsthatroardownfromthepolarplateautothesea.Leftbarearespectaculargorges,rippledfie
7、ldsofsanddunes,clustersofboulders(大圆石)sculpturedintofantasticshapesby100mileanhourwinds,andanauraofextraterrestrialdesolation.Despitetheunearthlyaspectofthedryvalleys,somescientistsbelievethattheymaycarrya
