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1、PartIIReadingComprehension(35minutes)PassageOneQuestions21to25arebasedonthefollowingpassage.Antarcticahasactuallybecomeakindofspacestation・auniqueobservationpostfordetectingimportantchangesintheworld'senvironment.Remotefrommajorsourcesofpollutionandthecomplexgeologicalandecologicalsystemsthatpre
2、vailelsewhere,Antarcticamakespossiblescientificmeasurementsthatareoftensharperandeasiertointerpretthanthosemadeinotherpartsoftheworld.GrowingnumbersofscientiststhereforeseeAntarcticaasadistantearlywarningsensor,wherepotentiallydangerousglobaltrendsmaybespottedbeforetheyshowuptothenorth.Onepromis
3、ingfieldofinvestigationisglaciology.ScholarsfromtheUnitedStates,Switzerland,andFrancearepursuingsevenseparatebutrelatedprojectsthatreflecttheirconcernforthehealthoftheWestAntarcticIceSheet・aconcerntheybelievetheworldatlargeshouldshare.TheTransantarcticMountain，someofthemmorethan14,000feethigh,di
4、videthecontinentintotwoverydifferentregions.Thepartofthecontinenttothe“east”ofthemountainsisahighplateaucoveredbyanicesheetnearlytwomilesthick.“West”'ofthemountain,thehalfofthecontinentsouthoftheAmericasisalsocoveredbyanicesheet,buttheretheicerestsonrockthatismostlywellbelowsealevel.IftheWestAnt
5、arcticIceSheetdisappeared,thewesternpartofthecontinentwouldbereducedtoasparseclusterofisland・Whileiceandsnowareobviouslycentraltomanyenvironmentalexperiments,othersfocusonthemysterious"dryvalley”ofAntarctica,valleysthatcontainlittleiceorsnoweveninthedepthsofwinter.Slashedthroughthemountainsofsou
6、thernVictorialand,thesevalleysonceheldenormousglaciersthatdescend9,000feetfromthepolarplateautotheRossSea・Nowtheglaciersaregone,perhapsacasualtyoftheglobalwarmingtrendduringthe10,000yearssincetheiceage.Eventhesnowthatfallsinthedryvalleysisblastedoutbyviciouswindsthatroardownfromthepolarplateauto
7、thesea.Leftbarearespectaculargorges,rippledfieldsofsanddunes,clustersofboulders(大圆石)sculpturedintofantasticshapesby100-mileanhourwinds,andanauraofextraterrestrialdesolation.Despitetheunearthlyaspectofthedryvalleys,somescient
