2000英语专四真题.docx

文档介绍：2000英语专四CLOZEThedifferencebetweenaliquidandagasisobvious(26)(27)(28)todiffusethroughoutthespaceavailable;itmust(29)bekeptinaclosedcontainer,as(30)’(31),forexample,onetheorymaintainedthataliquidcouldbe“dissolved”inavaporwithoutlosingitsidentity,andanothertheoryheldthatthetwophasesare(32)differentkindsofmolecules(分子).Thetheoriesnowprevailing(33),(34)esclearlyapparentwhenthetemperatureandpressureareraisedsomewhat.(35)(36),eslessdense;someofitevaporates.(37),(38)eequalis(39)(40);thereisasingle,undifferentiatedfluidphaseofuniformdensity. Ⅴ.