托福阅读原文题目及答案

Word版本，下载可自由编辑托福阅读原文题目及答案GlaciersarelargemassesoficeonlandthatshowevidenceofpastorpresentTheygrowbythegradualtransformationofsnowintoglacier

Afreshsnowfallisafluffymassoflooselypackedsnowflakes,smalldelicateicecrystalsgrownintheAsthesnowagesonthegroundforweeksormonths,thecrystalsshrinkandbecomemorecompact,andthewholemassbecomessqueezedtogetherintoamoredenseform,granularAsnewsnowfallsandburiestheoldersnow,thelayersofgranularsnowfurthercompacttoformfirm,amuchdenserkindofsnow,usuallyayearormoreold,whichhaslittleporeFurtherburialandslowcementation—aprocessbywhichcrystalsbecomeboundtogetherinamosaicofintergrownicecrystals—finallyproducesolidglacialInthisprocessofrecrystallization,thegrowthofnewcrystalsattheexpenseofoldones,thepercentageofairisreducedfromabout90percentforsnowflakestolessthan20percentforglacierThewholeprocessmaytakeaslittleasafewyears,butmorelikelytenortwentyyearsorThesnowisusuallymanymetersdeepbythetimethelowerlayersareconvertedinto

IncoldglaciersthoseformedinthecoldestregionsoftheEarth,theentiremassoficeisattemperaturesbelowthemeltingpointandnofreewaterIntemperateglaciers,theiceisatthemeltingpointateverypressurelevelwithintheglacier,andfreewaterispresentassmalldropsoraslargeraccumulationsintunnelswithinorbeneaththe

Formationofaglacieriscompletewhenicehasaccumulatedtoathickness(andthusweight)sufficienttomakeitmoveslowlyunderpressure,inmuchthesamewaythatsolidrockdeepwithintheEarthcanchangeshapewithoutOncethatpointisreached,theiceflowsdownhill,eitherasatongueoficefillingavalleyorasthickicecapthatflowsoutindirectionsfromthehighestcentralareawherethemostsnowThetripdownleadstotheeventualmeltingof

Whichofthefollowingdoesthepassagemainlydiscuss?

(A)Theeffectofglaciersonclimate

(B)Damagefromglaciers

(C)Glacierformation

(D)Thelocationofglaciers

Whichofthefollowingwillcausedensitywithintheglaciertoincrease?

(A)Increasedwaterandaircontent

(B)Pressurefromtheweightofnewsnow

(C)Longperiodsofdarknessandtemperaturevariations

(D)Movementoftheglacier

Thewordboundinline9isclosestinmeaningto

(A)covered

(B)chosen

(C)planned

(D)held

Whichofthefollowingwillbelostisaglacierforms?

(A)Air

(B)Pressure

(C)Weight

(D)Rocks

Accordingtothepassage,whichofthefollowingistheLEASTamountoftimenecessaryfor

glacialicetoform?

(A)severalmonths

(B)severalyears

(C)atleastfiftyyears

(D)acentury

Thewordconvertedinline15isclosestinmeaningto

(A)changed

(B)delayed

(C)promoted

(D)dissolved

Whatisthepurposeofthematerialinparagraphthree?

(A)Todefinetwotypesofglaciers

(B)Tocontrastglaciericewithnon-glacierice

(C)Topresenttheoriesofglacierformation

(D)Todiscussthesimilaritiesbetweenglacialtypes

Intemperateglaciers,whereiswaterfound?

(A)Onlynearthesurface

(B)Inpoolsofvariousdepths

(C)Inathinlayerbelowthefirm

(D)Intunnels

Theworditinline21refersto

(A)formation

(B)ice

(C)thickness

(D)weight

Itcanbeinferredfromthelastparagraphthataglacier

(A)canreverttoafluffymass

(B)maintainsthe