2012大学英语六级考试阅读考试训练
<p> <span word="The">The</span> <span word="difference">difference</span> <span word="between">between</span> <span word="a">a</span> <span word="liquid">liquid</span> <span word="and">and</span> <span word="a">a</span> <span word="gas">gas</span> <span word="is">is</span> <span word="obvious">obvious</span> <span word="under">under</span> <span word="the">the</span> <span word="conditions">conditions</span> <span word="of">of</span> <span word="temperature">temperature</span> <span word="and">and</span> <span word="pressure">pressure</span> <span word="commonly">commonly</span> <span word="found">found</span> <span word="at">at</span> <span word="the">the</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span>. <span word="A">A</span> <span word="liquid">liquid</span> <span word="can">can</span> <span word="be">be</span> <span word="kept">kept</span> <span word="in">in</span> <span word="an">an</span> <span word="open">open</span> <span word="container">container</span> <span word="and">and</span> <span word="fill">fill</span> <span word="it">it</span> <span word="to">to</span> <span word="the">the</span> <span word="level">level</span> <span word="of">of</span> <span word="a">a</span> <span word="free">free</span> <span word="surface">surface</span>. <span word="A">A</span> <span word="gas">gas</span> <span word="forms">forms</span> <span word="no">no</span> <span word="free">free</span> <span word="surface">surface</span> <span word="but">but</span> <span word="tends">tends</span> <span word="to">to</span> <span word="diffuse">diffuse</span> <span word="throughout">throughout</span> <span word="the">the</span>__1__<span word="available">available</span>; <span word="it">it</span> <span word="must">must</span> <span word="therefore">therefore</span> <span word="be">be</span> <span word="kept">kept</span> <span word="in">in</span> <span word="a">a</span> <span word="closed">closed</span> <span word="container">container</span> <span word="or">or</span> <span word="held">held</span> <span word="by">by</span> <span word="a">a</span> <span word="gravitational">gravitational</span> <span word="field">field</span>, <span word="as">as</span> <span word="in">in</span> <span word="the">the</span>__2__<span word="of">of</span> <span word="a">a</span> <span word="planets">planets</span> <span word="atmosphere">atmosphere</span>. <span word="The">The</span> <span word="distinction">distinction</span> <span word="was">was</span> <span word="a">a</span> __3__<span word="feature">feature</span> <span word="of">of</span> <span word="early">early</span> <span word="theories">theories</span> <span word="describing">describing</span> <span word="the">the</span> <span word="phases">phases</span> <span word="of">of</span> <span word="matter">matter</span>. <span word="In">In</span> <span word="the">the</span> <span word="nineteenth">nineteenth</span> <span word="century">century</span>, <span word="for">for</span> <span word="example">example</span>, <span word="one">one</span> <span word="theory">theory</span> <span word="maintained">maintained</span> <span word="that">that</span> <span word="a">a</span> <span word="liquid">liquid</span> <span word="could">could</span> <span word="be">be</span> <span word="dissolved">dissolved</span> <span word="in">in</span> <span word="a">a</span> <span word="vapor">vapor</span> <span word="without">without</span> <span word="losing">losing</span> <span word="its">its</span> <span word="identity">identity</span>, <span word="and">and</span> <span word="another">another</span> <span word="theory">theory</span>__4 __<span word="that">that</span> <span word="the">the</span> <span word="two">two</span> <span word="phases">phases</span> <span word="are">are</span> <span word="made">made</span> <span word="up">up</span> <span word="of">of</span> <span word="different">different</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="molecules">molecules</span>. <span word="The">The</span> <span word="theories">theories</span> <span word="now">now</span> <span word="prevailing">prevailing</span> <span word="take">take</span> <span word="a">a</span> <span word="quite">quite</span> <span word="different">different</span> <span word="approach">approach</span> <span word="by">by</span> <span word="emphasizing">emphasizing</span> <span word="what">what</span> <span word="liquids">liquids</span> <span word="and">and</span> <span word="gases">gases</span> <span word="have">have</span> <span word="in">in</span> __5 __<span word="They">They</span> <span word="are">are</span> <span word="both">both</span> <span word="forms">forms</span> <span word="of">of</span> <span word="matter">matter</span> <span word="that">that</span> <span word="have">have</span> <span word="no">no</span> __6 __<span word="structure">structure</span>, <span word="and">and</span> <span word="they">they</span> <span word="both">both</span> <span word="flow">flow</span> <span word="readily">readily</span>.</p><p> <span word="The">The</span> <span word="fundamental">fundamental</span> <span word="similarity">similarity</span> <span word="of">of</span> <span word="liquids">liquids</span> <span word="and">and</span> <span word="gases">gases</span> <span word="becomes">becomes</span> <span word="clearly">clearly</span> <span word="apparent">apparent</span> <span word="when">when</span> <span word="the">the</span> <span word="temperature">temperature</span> <span word="and">and</span> <span word="pressure">pressure</span> <span word="are">are</span> __7__<span word="somewhat">somewhat</span>. <span word="Suppose">Suppose</span> <span word="a">a</span> <span word="closed">closed</span> <span word="container">container</span> __8__<span word="filled">filled</span> <span word="with">with</span> <span word="a">a</span> <span word="liquid">liquid</span> <span word="is">is</span> <span word="heated">heated</span>. <span word="The">The</span> <span word="liquid">liquid</span> <span word="expands">expands</span>, <span word="or">or</span> <span word="in">in</span> <span word="other">other</span> <span word="words">words</span> <span word="becomes">becomes</span> <span word="less">less</span> <span word="dense">dense</span>; <span word="some">some</span> <span word="of">of</span> <span word="it">it</span> <span word="evaporates">evaporates</span>. <span word="In">In</span> <span word="contrast">contrast</span>, <span word="the">the</span> <span word="vapor">vapor</span> <span word="above">above</span> <span word="the">the</span> <span word="liquid">liquid</span> <span word="surface">surface</span> <span word="becomes">becomes</span> <span word="denser">denser</span> <span word="as">as</span> <span word="the">the</span> <span word="evaporated">evaporated</span> <span word="molecules">molecules</span> <span word="are">are</span> __9__<span word="to">to</span> <span word="it">it</span>. <span word="The">The</span> <span word="combination">combination</span> <span word="of">of</span> <span word="temperature">temperature</span> <span word="and">and</span> <span word="pressure">pressure</span> <span word="at">at</span> <span word="which">which</span> <span word="the">the</span> <span word="densities">densities</span> <span word="become">become</span> __10__<span word="is">is</span> <span word="called">called</span> <span word="the">the</span> <span word="critical">critical</span> <span word="point">point</span>.</p><p> <span word="A">A</span>. <span word="added">added</span> <span word="B">B</span>. <span word="case">case</span> <span word="C">C</span>. <span word="prominent">prominent</span> <span word="D">D</span>. <span word="held">held</span> <span word="E">E</span>. <span word="equal">equal</span> <span word="F">F</span>. <span word="partially">partially</span> <span word="G">G</span>. <span word="example">example</span> <span word="H">H</span>. <span word="previous">previous</span> <span word="I">I</span>. <span word="space">space</span> <span word="J">J</span>. <span word="lifted">lifted</span> <span word="K">K</span>. <span word="permanent">permanent</span> <span word="L">L</span>. <span word="particularly">particularly</span> <span word="M">M</span>. <span word="extended">extended</span> <span word="N">N</span>. <span word="raised">raised</span> <span word="O">O</span>. <span word="common">common</span></p>
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