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英语六级考试阅读理解能力提升训练.docx

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英语六级考试阅读理解能力提升训练2017年英语六级考试阅读理解能力提升训练Icebergsareamongnature'smostspectacularcreations,andyetmostpeoplehaveneverseenone.Avagueairofmysteryenvelopsthem.Theycomeintobeing-somewhere-infaraway,frigidwaters,andthunderousnoiseandsplashingturbulence,whichinmostcasesnoonehearsorsees.Theyexistonlyashorttimeandthenslowlywasteawayjustasunnoticed.Objectsofsheerestbeauty,theyhavebeencalled.Appearinginanendlessvarietyofshapes,theymaybedazzlinglywhite,ortheymaybeglassyblue,green,orpurple,tintedfaintlyofdarkerhues(颜色).Theyaregraceful,stately(宏伟的),inspiringincalm,sunlitseas.Buttheyarealsocalledfrighteninganddangerous,andthattheyare-inthenight,inthefog,andinstorms.Eveninclearweatheroneiswisetostayasafedistanceawayfromthem.Mostoftheirbulkishiddenbelowthewater,sotheirunderwaterpartsmayextendoutfarbeyondthevisibletop.Also,theymayrolloverunexpectedly,churning(剧烈搅动)thewatersaroundthem.Icebergsarepartsofglaciersthatbreakoff,driftintothewater.floataboutawhileandfinallymelt.Icebergsafloattodayaremadeofsnowflakesthathavefallenoverlongagesoftime.Theyembodysnowsthatdrifteddownhundred,ormanythousand,orinsomecases,maybeamillionyearsago.Thesnowsfellinpolar-regionsandoncoldmountains,wheretheymeltedonlyalittleornotatallandsocollectedtogreatdepthsovertheyearsandcenturies.Aseachyear'ssnowaccumulationlayonthesurface,evaporationandmeltingcausedthesnowflakesslowlytolosetheirfeatherypointsandbecometinygrainsofice.Whennewsnowfellontopoftheold,ittooturnedintoicygrains.Soblanketsofsnowandicegrainsmountedlayeruponlayerandwereofsuchgreatthicknessthattheweightoftheupperlayerscompressedthelowerones.Withtimeandpressurefromabove,themanysmallicegrainsjoinedandchangedtolargercrystals,andeventuallythedeepercrystalsmergedintoasolidmassofice.1.Theauthorstatesthaticebergsarerarelyseenastheyappearin_______________oftheworld.2.Fromthepassage,wecanknowthattheshapeoficebergsis___________________.3.Accordingtothepassage,icebergsarescaryanddangerousbecausetheyarelikelyto_______________________suprisingly.4.Whatglaciers