【导读】华图福建国企考试网同步福建国企招聘网发布：中移铁通校园招聘考试英语试题一（附解析）,详细信息请阅读下文!更多招考信息尽在【福建国企考试招考汇总】
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Questions1to5arebasedonthefollowingpassage:
Ifthesalinityofoceanwaterisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplace.Nevertheless,someofthesesmallchangesareimportant.Therearethreebasicprocessesthatcauseachangeinoceanicsalinity.Oneoftheseisthesubtractionofwaterfromtheoceanbymeansofevaporation—conversionofliquidwatertowatervapor.Inthismanner,thesalinityisincreased,sincethesaltsstaybehind.Ifthisiscarriedtotheextreme,ofcourse,whitecrystalsofsaltwouldbeleftbehind;this,bytheway,ishowmuchofthetablesaltweuseisactuallyobtained.
Theoppositeofevaporationisprecipitation,suchasrain,bywhichwaterisaddedtotheocean.Heretheoceanisbeingdilutedsothatthesalinityisdecreased.Thismayoccurinareasofhighrainfallorincoastalregionswhereriversflowintotheocean.Thussalinitymaybeincreasedbythesubtractionofwaterbyevaporation,ordecreasedbytheadditionoffreshwaterbyprecipitationorrunoff.
Normally,intropicalregionswherethesunisverystrong,theoceansalinityissomewhathigherthanitisinotherpartsoftheworldwherethereisnotasmuchevaporation.Similarly,incoastalregionswhereriversdilutethesea,salinityissomewhatlowerthaninotheroceanicareas.
Athirdprocessbywhichsalinitymaybealteredisassociatedwiththeformationandmeltingofseaice.Whenseawaterisfrozen,thedissolvedmaterialsareleftbehind.Inthismanner,
seawaterdirectlybeneathfreshlyformedseaicehasahighersalinitythanitdidbeforetheiceappeared.Ofcourse,whenthisicemelts,itwelltendtodecreasethesalinityofthesurroundingwater.
IntheWeddellSea,offAntarctica,thedensestwaterintheoceansisformedasaresultofthisfreezingprocess,whichincreasesthesalinityofcoldwater.Thisheavywatersinksandisfoundinthedeeperportionsofoceansoftheworld.
1.Whatisthemaintopicofthepassage?
A.Wheredowegetourtablesalt?
B.Oceanicsalinityintropicalregions
C.Threebasicprocessesthatalteroceanicsalinity
D.Variationsofsalinityindifferentpartsoftheocean
2.Accordingtotheauthor,theoceanicsalinityisusuallylowerin_____.
A.tropicalregions
B.coastalregions
C.placesinwhichwarmcurrentsandcoldcurrentsmeet
D.theAntarctica
3.Allofthefollowingareprocessesthatdecreaseoceansalinityexcept_____.
A.precipitationB.runoffC.meltingD.evaporation
4.Whatdoestheword“subtraction"inthefourthlineofthefirstparagraphmean?
A.reductionB.influxC.transformationD.freezing
5.WhichofthefollowingisNOTaresultoftheformationoficeinoceans?
A.Thesurroundingwatersinks.
B.Thewaterbecomesdenser.
C.Watersalinitydecreases.
