2015英语四级阅读练习题及答案解析(12)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英语四级阅读练习题及答案解析(12)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.
Vocabulary
1.distant-early-warningsensor远距离早期报警传感器
2.plateau高原，高地
3.slash挥砍
4.blast一阵疾风/狂风
5.vicious邪恶的，凶魔般的
6.gorge峡谷
7.ripple起伏，使起微波
8.sanddune沙丘
9.verdant绿色
10.extraterrestrial地球之外的
11.aura气氛
参考答案：
1.A2.D3.C4.C
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