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英语六级CET完形填空模拟试题英语六级CET完形填空模拟试题2017钉子有两个好处：一个是挤劲，一个是钻劲。我们在学习上要提倡这种钉子精神，善于挤和钻。以下是小编为大家搜索整理的英语六级CET完形填空模拟试题2017，希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!ThedifferencebetweenaliquidandagasisobviousundertheconditionsoftemperatureandpressurecommonlyfoundatthesurfaceoftheEarth.Aliquidcanbekeptinanopencontainerandfillittothelevelofafreesurface.Agasformsnofreesurfacebuttendstodiffusethroughoutthe11available;itmustthereforebekeptinaclosedcontainerorheldbyagravitationalfield,asinthe12ofaplanet'satmosphere.Thedistinctionwasa13featureofearlytheoriesdescribingthephasesofmatter.Inthenineteenthcentury,forexample,onetheorymaintainedthataliquidcouldbe"dissolved"inavaporwithoutlosingitsidentity,andanothertheory14thatthetwophasesaremadeupofdifferentkindsofmolecules.Thetheoriesnowprevailingtakeaquitedifferentapproachbyemphasizingwhatliquidsandgaseshavein15Theyarebothformsofmatterthathaveno16structure,andtheybothflowreadily.Thefundamentalsimilarityofliquidsandgasesbecomesclearlyapparentwhenthetemperatureandpressureare17somewhat.Supposeaclosedcontainer18filledwithaliquidisheated.Theliquidexpands,orinotherwordsbecomeslessdense;someofitevaporates.Incontrast,thevaporabovetheliquidsurfacebecomesdenserastheevaporatedmoleculesare19toit.Thecombinationoftemperatureandpressureatwhichthedensitiesbecome20iscalledthecriticalpoint.A.addedB.caseC.prominentD.heldE.equalF.partiallyG.exampleH.previousI.spaceJ,liftedK.permanentL.particularlyM.extendedN.raised0.common参考答案II.I12.B13.C14.D15.O16.K17.N18.F19.A20.E
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