英语六级阅读理解考试题模拟练习.docx

英语六级阅读理解考试题模拟练习

2017年英语六级阅读理解考试题模拟练习 旧书不厌百回读，熟读精思子自知。以下是小编为大家搜索整理的2017年英语六级阅读理解考试题模拟练习，希望能给大家带来帮助!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.added B.case C.prominent D.held E.equal F.partially G.example H.previous I.space J,lifted K.permanent L.particularly M.extended N.raised 0.common 参考答案 II.I12.B13.C14.D15.O16.K17.N18.F19.A20.E