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2016年6月英语四级考试:仔细阅读练习(10)思维导图

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查看详情2016年6月英语四级考试:仔细阅读练习(10)思维导图

  When we analyze the salt salinity(盐浓度) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There

树图思维导图提供 2016年6月英语四级考试:仔细阅读练习(10) 在线思维导图免费制作,点击“编辑”按钮,可对 2016年6月英语四级考试:仔细阅读练习(10)  进行在线思维导图编辑,本思维导图属于思维导图模板主题,文件编号是:2eb4bba8707fa80f8574ffd16e378c37

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2016年6月英语四级考试:仔细阅读练习(10)思维导图模板大纲

Whenweanalyzethesaltsalinity(盐浓度)ofoceanwaters,wefindthatitvariesonlyslightlyfromplacetoplace.Nevertheless,someofthesesmallchangesareimportant.Therearethreebasicprocessesthatcauseachangeinoceanicsalinity.Oneoftheseisthesubtractionofwaterfromtheoceanbymeansofevaporation.Inthismanner,thesalinityisincreased,sincethesaltstaysbehind.Ifthisiscarriedtotheextreme,ofcourse,whitesaltwouldbeleftbehind;this,bytheway,ishowmuchofthetablesaltweuseisactuallyobtained.

Theoppositeofevaporationisprecipitation,suchasrain,bywhichwaterisaddedtotheocean.Heretheoceanisbeingdiluted(稀释)sothatthesalinityisdecreased.Thismayoccurinareasofhighrainfallorincoastalregionswhereriversflowintotheocean.Thussalinitymaybeincreasedbythesubtractionofwaterbyevaporation,ordecreasedbytheadditionoffreshwaterbyprecipitation.

Normally,inhotregionswherethesunisverystrong,theoceansalinityissomewhathigherthanitisinotherpartsoftheworldwherethereisnotasmuchevaporation.Similarly,incoastalregionswhereriversdilutethesea,salinityissomewhatlowerthaninotheroceanicareas.

Athirdprocessbywhichsalinitymaybealteredisassociatedwiththeformationandmeltingofseaice.Whenseawaterisfrozen,thedissolvedmaterialsareleftbehind..Inthismanner,seawaterdirectlybeneathfreshlyformedseaicehasahighersalinitythanitdidbeforetheiceappeared.Ofcourse,whenthisicemelts,itwilltendtodecreasethesalinityofthesurroundingwater.

IntheWeddellSea,thedensestwaterintheoceanisformedasaresultofthisfreezingprocess,whichincreasesthesalinityofcoldwater.Thisheavywatersinksandisfoundinthedeeperportionoftheoceansoftheworld.

26.Thispassagemainlytellsusabout_______.

A.theanalysisofthesalinityofoceanwaters

B.thecausesofthevariationinoceanicsalinity

C.theimportanceofthechangesinoceanicsalinity

D.thedifferentformsofsaltsinoceanwaters

27.Itcanbeknownfromthepassagethatincreaseinthesalinityofoceanwateriscaused

by______.

A.meltingofseaiceB.precipitation

C.evaporationD.supplementofsalt

28.Whichofthefollowingisnotthecauseofthedecreaseintheoceanicsalinity?

A.Precipitation.B.Rainandsnow.

C.Formationofice.D.Additionofwaterbyrivers.

29.WhichofthefollowingstatementsisTRUEaccordingtothepassage?

A.Oceanicsalinityhasgreateffectonsealife.

B.Manyfactorscombinetocausechangesinoceanicsalinity.

C.Themovementofthewaterisrelatedtotheamountofsalt.

D.Thetemperatureofthewaterhasmuchtodowiththeoceanicsalinity.

30.ThepurposeofmentioningtheWeddellSeais_______.

A.togiveanexampleofcold-watersalinity

B.topointoutthelocationofdeepwaters

C.tomakeacomparisonbetweenhot-watersalinityandcold-watersalinity

D.toshowthatthewaterintheWeddellSeavariesinsalinityfromplacetoplace

答案:26.B27.C28.C29.D30.A

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