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2015英语四级仔细阅读真题练习及答案(1)思维导图

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查看详情2015英语四级仔细阅读真题练习及答案(1)思维导图

  Antarctica has actually become a kind of space station a unique observation post for detecting important changes in the world's environment. Remote from major sources of pollution

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2015英语四级仔细阅读真题练习及答案(1)思维导图模板大纲

Antarcticahasactuallybecomeakindofspacestationauniqueobservationpostfordetectingimportantchangesintheworld'senvironment.Remotefrommajorsourcesofpollutionandthecomplexgeologicalandecologicalsystemsthatprevailelsewhere,Antarcticamakespossiblescientificmeasurementsthatareoftensharperandeasiertointerpretthanthosemadeinotherpartsoftheworld.

GrowingnumbersofscientiststhereforeseeAntarcticaasadistant-early-warningsensor,wherepotentiallydangerousglobaltrendsmaybespottedbeforetheyshowuptothenorth.Onepromisingfieldofinvestigationisglaciology.ScholarsfromtheUnitedStates,Switzerland,andFrancearepursuingsevenseparatebutrelatedprojectsthatreflecttheirconcernforthehealthoftheWestAntarcticIceSheetaconcerntheybelievetheworldatlargeshouldshare.

TheTransantarcticMountain,someofthemmorethan14,000feethigh,dividethecontinentintotwoverydifferentregions.Thepartofthecontinenttothe"east"ofthemountainsisahighplateaucoveredbyanicesheetnearlytwomilesthick."West"ofthemountain,thehalfofthecontinentsouthoftheAmericasisalsocoveredbyanicesheet,buttheretheicerestsonrockthatismostlywellbelowsealevel.IftheWestAntarcticIceSheetdisappeared,thewesternpartofthecontinentwouldbereducedtoasparseclusterofisland.

Whileiceandsnowareobviouslycentraltomanyenvironmentalexperiments,othersfocusonthemysterious"dryvalley"ofAntarctica,valleysthatcontainlittleiceorsnoweveninthedepthsofwinter.SlashedthroughthemountainsofsouthernVictoriaLand,thesevalleysonceheldenormousglaciersthatdescended9,000feetfromthepolarplateautotheRossSea.Nowtheglaciersaregone,perhapsacasualtyoftheglobalwarmingtrendduringthe10,000yearssincetheiceage.Eventhesnowthatfallsinthedryvalleysisblastedoutbyviciouswindsthatroarsdownfromthepolarplateautothesea.Leftbarearespectaculargorges,rippledfieldsofsanddunes,clustersofboulderssculpturedintofantasticshapesby100-mile-an-hourwinds,andanauraofextraterrestrialdesolation.

Despitetheunearthlyaspectofthedryvalleys,somescientistsbelievetheymaycarryamessageofhopeoftheverdantpartsoftheearth.Somescientistsbelievethatinsomecasesthedryvalleysmaysoakuppollutantsfasterthanpollutantsenterthem.

1.Whatisthebesttitleforthispassage?

[A]AntarcticaandenvironmentalProblems.

[B]Antarctica:Earth'sEarly-Warningstation.

[C]Antarctica:aUniqueObservationPost.

[D]Antarctica:aMysteriousPlace.

2.WhatwouldtheresultbeiftheWestAntarcticIceSheetdisappeared?

[A]Thewesternpartofthecontinentwouldbedisappeared.

[B]Thewesternpartofthecontinentwouldbereduced.

[C]ThewesternpartofthecontinentwouldbecomescatteredIslands.

[D]ThewesternpartofthecontinentwouldbereducedtoaclusterofIslands.

3.WhyaretheDryValleysleftbare?

[A]Viciouswindblaststhesnowaway.

[B]Itrarelysnows.

[C]Becauseoftheglobalwarmingtrendandfiercewind.

[D]Sanddunes.

4.Whichofthefollowingistrue?

[A]The"DryValleys"havenothingleftinside.

[B]The"DryValleys"neverheldglaciers.

[C]The"DryValleys"maycarryamessageofhopefortheverdant.

[D]The"DryValleys"areuselesstoscientists.

参考答案:

1.A2.D3.C4.C

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