2000英语专四真题.docx

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1、2000英语专四CLOZEThedifferencebetweenaliquidandagasisobvious(26)theconditionsoftemperatureandpressurecommonlyfoundatthesurfaceoftheEarth.Aliquidcanbekeptinanopencontainerand(27)ittothelevelofafreesurface.Agasformsnofreesurfacebut(28)todiffusethroughoutthespac

2、eavailable;itmust(29)bekeptinaclosedcontainer,as(30)aplanet’satmosphere.Thedistinctionwasaprominentfeatureofearlytheories(31)thephasesofmatter.Inthenineteenthcentury,forexample,onetheorymaintainedthataliquidcouldbe“dissolved”inavaporwithoutlosingitsidenti

3、ty,andanothertheoryheldthatthetwophasesare(32)differentkindsofmolecules(分子).Thetheoriesnowprevailing(33)aquitedifferentapproachbyemphasizingwhatliquidsandgaseshaveincommon.Theyarebothformsofmatterthathavenopermanentstructure,andtheybothfloweasily.Theyaref

4、luids.The(34)similarlyofliquidsandgasesbecomesclearlyapparentwhenthetemperatureandpressureareraisedsomewhat.(35)aclosedcontainerpartiallyfilledwithaliquidisheated.Theliquidexpandsor(36),becomeslessdense;someofitevaporates.(37),thevaporabovetheliquidsurfac

5、ebecomesdenserastheevaporatedmoleculesareaddedtoit.Thecombinationoftemperatureandpressure(38)thedensitiesbecomeequalis(39)thecriticalpoint.Abovethecriticalpointtheliquidandthegascannolongerbe(40);thereisasingle,undifferentiatedfluidphaseofuniformdensity.　

6、　26.A.inB.onC.underD.beyond　　27.A.fillsB.befilledC.fillingD.tofill　　28.A.intendsB.tendsC.inclinesD.contends　　29.A.howeverB.neverthelessC.soD.therefore30．A.intheeventofB.inthecaseofC.withaviewtoD.withreferenceto31.A.havingdescribedB.describedC.describingD.

7、tohavedescribed32.A.madeupofB.consistedofC.constitutedofD.madefrom　　33.A.applyB.adaptC.takeD.conduct　　34.A.elementaryB.crucialC.rudimentaryD.fundamental　　35.A.SupposeB.TosupposeC.BeingsupposedD.Supposed　　36.A.inawordB.inthemeantimeC.inotherwordsD.inthatca

8、se　　37.A.SimilarlyB.IncontrastC.FurthermoreD.Instead　　38.A.onthatB.onwhichC.atthatD.atwhich　　39.A.knownB.definedC.calledD.referredto40.A.classifiedB.recognizedC.categorizedD.distinguishedPartⅤGRAMMARANDVOCABULARY41.