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1、银行校园招聘考试英语部分专项练习（一）PartIReadingComprehensionDirections:Thereare4readingpassagesinthispart•Eachpassageisfollowedbysomequestionsorunfinishedstatements•ForeachofthemtherearefourchoicesmarkedA.,B.,C.andD.YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheetwithasinglelinethroughthe
2、center•Questions1to5arebasedonthefollowingpassage:Ifthesalinityofoceanwaterisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplace・Nevertheless，someofthesesmallchangesareimportant.Therearethreebasicprocessesthatcauseachangeinoceanicsalinity.Oneoftheseisthesubtractionofwaterfromtheoceanbymeansofevapor
3、ation一conversionofliquidwatertowatervapor.Inthismanner,thesalinityisincreased,sincethesaltsstaybehind.Ifthisisearnedtotheextreme,ofcourse,whitecrystalsofsaltwouldbeleftbehind;this,bytheway,ishowmuchofthetablesaltweuseisactuallyobtained.Theoppositeofevaporationisprecipitation,suchasrain,bywhichwateri
4、saddedtotheocean.Heretheoceanisbeingdilutedsothatthesalinityisdecreased.Thismayoccurinareasofhighrainfallorincoastalregionswhereriversflowintotheocean.Thussalinitymaybeincreasedbythesubtractionofwaterbyevaporation,ordecreasedbytheadditionoffreshwaterbyprecipitationorrunoff-Normally,intropicalregions
5、wherethesunisverystrong,theoceansalinityissomewhathigherthanitisinotherpartsoftheworldwherethereisnotasmuchevaporation.Similarly,incoastalregionswhereriversdilutethesea,salinityissomewhatlowerthaninotheroceanicareas.Athirdprocessbywhichsalinitymaybealteredisassociatedwiththeformationandmeltingofseai
6、ce.Whenseawaterisfrozen,thedissolvedmaterialsareleftbehind.Inthismanner,seawaterdirectlybeneathfreshlyformedseaicehasahighersalinitythanitdidbeforetheiceappeared.Ofcourse,whenthisicemelts,itwelltendtodecreasethesalinityofthesurroundingwater.IntheWeddellSea,offAntarctica,thedensestwaterintheoceansisf
7、ormedasaresultofthisfreezingprocess,whichincreasesthesalinityofcoldwater.Thisheavywatersinksandisfoundinthedeeperportionsofoceansoftheworld.1.Whatisthemaintopicofthepassage?A.Wheredowegetourtablesalt?
