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年月英语六级考试完形填空20xx12模拟练习年月英语六级考试完形填空模拟练习20xx12英语是现在世界上用的最多的一门语言,许多国家都在学英语和用英语,所以,学好了英语,出门就不怕沟通不便利了下面是为大家搜寻整理的英语六级辅导训练,希望能给大家带来帮助!The differencebetween a liquid anda gasis obviousunderthe conditionsof temperature and pressurecommonlyfound atthe surfaceof theEarth.A liquidcanbe keptin anopen containerand fillit tothe levelof afree surface.A gasforms nofreesurfacebut tendstodiffuse throughoutthe11available;it musttherefore bekeptin aclosed containeror heldby agravitational field,as inthe12of aplanets atmosphere.The distinctionwasa13feature ofearly theoriesdescribing thephases ofmatter.In thenineteenth century,for example,onetheory maintainedthat aliquid couldbe dissolvedin avaporwithout losingits identity,and anothertheory14that thetwo phasesare madeup ofdifferent kindsofmolecules.The theoriesnow prevailingtake aquitedifferent approachby emphasizingwhat liquids andgases havein15They areboth formsof matterthathave no16structure,and theyboth flowreadily.The fundamentalsimilarity ofliquidsandgasesbecomes clearlyapparent whenthe temperatureandpressure are17somewhat.Suppose aclosed container18filled withaliquidis heated.The liquidexpands,or inotherwords becomesless dense;some ofit evaporates.In contrast,the vaporabove theliquid surfacebecomesdenser asthe evaporatedmolecules are19to it.Thecombination oftemperatureandpressure atwhich thedensitiesbecome20is calledthe criticalpoint.A.addedB.caseC.prominentD.heldE.equalF.partiallyG.exampleH.previousI.spaceJ.liftedK.permanent L.particularly M.extendedN.raisedO.common参考答案II.I
12.B
13.C
14.D
15.O
16.K
17.N
18.F
19.A
20.。