17年英语专四完形填空训练.docx

17年英语专四完形填空训练

倘不学习，再美好的理想也会化成泡影;倘不勤奋，再美妙的计划也会付之东流;倘不实践，再广博的知识也会束之高阁。以下是小编为大家搜索整理17年英语专四完形填空训练，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! part1 ThedifferencebetweenaliquidandagasisobviousundertheconditionsoftemperatureandpressurecommonlyfoundatthesurfaceoftheEarth.Aliquidcanbekeptinanopencontainerandfillittothelevelofafreesurface.Agasformsnofreesurfacebuttendstodiffusethroughoutthe__11__available;itmustthereforebekeptinaclosedcontainerorheldbyagravitationalfield,asinthe__12__ofaplanet'satmosphere.Thedistinctionwasa__13__featureofearlytheoriesdescribingthephasesofmatter.Inthenineteenthcentury,forexample,onetheorymaintainedthataliquidcouldbe"dissolved"inavaporwithoutlosingitsidentity,andanothertheory__14__thatthetwophasesaremadeupofdifferentkindsofmolecules.Thetheoriesnowprevailingtakeaquitedifferentapproachbyemphasizingwhatliquidsandgaseshavein__15__Theyarebothformsofmatterthathaveno__16__structure,andtheybothflowreadily. Thefundamentalsimilarityofliquidsandgasesbecomesclearlyapparentwhenthetemperatureandpressureare__17__somewhat.Supposeaclosedcontainer__18__filledwithaliquidisheated.Theliquidexpands,orinotherwordsbecomeslessdense;someofitevaporates.Incontrast,thevaporabovetheliquidsurfacebecomesdenserastheevaporatedmoleculesare__19__toit.Thecombinationoftemperatureandpressureatwhichthedensitiesbecome__20__iscalledthecriticalpoint. A.addedB.caseC.prominentD.held E.equalF.partiallyG.exampleH.previous I.spaceJ.liftedK.permanentL.particularly M.extendedN.raised0.common 参考答案 II.I12.B13.C14.D15.O16.K17.N18.F19.A20.E part2 Duringthenineteenthandtwentiethcenturies,migrationshavetakenplacewithin11countries;thecitieswiththeirindustrieshaveattractedpeopleawayfromthecountry.Thepossibilityofearningafixed12inafactoryorofficewasmoreattractivethanthepossibilityofstayingonthefarmandhavingone'swork13byfrost,storms,ordroughts.Furthermore,the developmentofagriculturalmachinerymadeitpossibleforfewerpeopletodothesame14ofwork. Thus,atthesametimewhentheindustrialrevolutionmade