2012年职称英语考试-理工类B级概括大意
<p> 第三部分：概括大意和完成句子(第23~30题，每题1分，共8分)</p><p> 下面的短文后有2项测试任务：(1)第23~26题要求从所给的6个选项中为指定段落每段选择1个小标题;(2)第27~30题要求从所给的6个选项中为每个句子确定一个最佳选项。</p><p> <span word="Learn">Learn</span> <span word="about">about</span> <span word="Noble">Noble</span> <span word="Gases">Gases</span>(惰性气体)</p><p> 1. <span word="Have">Have</span> <span word="you">you</span> <span word="ever">ever</span> <span word="ridden">ridden</span> <span word="on">on</span> <span word="a">a</span> <span word="balloon">balloon</span>? <span word="Many">Many</span> <span word="tourist">tourist</span> <span word="spots">spots</span> <span word="offer">offer</span> <span word="balloon">balloon</span> <span word="rides">rides</span> <span word="in">in</span> <span word="order">order</span> <span word="for">for</span> <span word="people">people</span> <span word="to">to</span> <span word="see">see</span> <span word="the">the</span> <span word="beauty">beauty</span> <span word="of">of</span> <span word="a">a</span> <span word="place">place</span> <span word="from">from</span> <span word="above">above</span>. <span word="A">A</span> <span word="balloon">balloon</span> <span word="contains">contains</span> <span word="a">a</span> <span word="noble">noble</span> <span word="gas">gas</span> <span word="called">called</span> <span word="helium">helium</span>. <span word="Formerly">Formerly</span>, <span word="balloons">balloons</span> <span word="contained">contained</span> <span word="hydrogen">hydrogen</span> <span word="but">but</span> <span word="hydrogen">hydrogen</span> <span word="is">is</span> <span word="very">very</span> <span word="flammable">flammable</span> <span word="and">and</span> <span word="dangerous">dangerous</span> <span word="when">when</span> <span word="uncontrolled">uncontrolled</span>. <span word="Therefore">Therefore</span>, <span word="people">people</span> <span word="shifted">shifted</span> <span word="to">to</span> <span word="helium">helium</span>, <span word="which">which</span> <span word="is">is</span> <span word="safer">safer</span>. <span word="Helium">Helium</span> <span word="is">is</span> <span word="safe">safe</span> <span word="because">because</span> <span word="it">it</span> <span word="has">has</span> <span word="the">the</span> <span word="properties">properties</span> <span word="of">of</span> <span word="the">the</span> <span word="noble">noble</span> <span word="gases">gases</span>.</p><p> 2. <span word="People">People</span> <span word="once">once</span> <span word="believed">believed</span> <span word="that">that</span> <span word="noble">noble</span> <span word="gases">gases</span> <span word="couldnt">couldnt</span> <span word="chemically">chemically</span> <span word="react">react</span> <span word="at">at</span> <span word="all">all</span>. <span word="For">For</span> <span word="this">this</span> <span word="reason">reason</span>, <span word="they">they</span> <span word="were">were</span> <span word="called">called</span> <span word="inert">inert</span> <span word="gases">gases</span>. <span word="They">They</span> <span word="were">were</span> <span word="also">also</span> <span word="clustered">clustered</span> <span word="under">under</span> <span word="Group">Group</span> 0 <span word="in">in</span> <span word="the">the</span> <span word="old">old</span> <span word="periodic">periodic</span> <span word="table">table</span> <span word="because">because</span> <span word="scientists">scientists</span> <span word="believed">believed</span> <span word="that">that</span> <span word="the">the</span> <span word="gases">gases</span> <span word="have">have</span> <span word="zero">zero</span> <span word="valence">valence</span> <span word="electrons">electrons</span> <span word="in">in</span> <span word="their">their</span> <span word="outer">outer</span> <span word="shell">shell</span>. <span word="This">This</span> <span word="was">was</span> <span word="later">later</span> <span word="proven">proven</span> <span word="to">to</span> <span word="be">be</span> <span word="untrue">untrue</span> <span word="when">when</span> <span word="some">some</span> <span word="noble">noble</span> <span word="gas">gas</span> <span word="compounds">compounds</span> <span word="were">were</span> <span word="discovered">discovered</span>.</p><p> 3. <span word="The">The</span> <span word="gases">gases</span> <span word="are">are</span> <span word="elements">elements</span>, <span word="which">which</span> <span word="share">share</span> <span word="similar">similar</span> <span word="properties">properties</span>. <span word="These">These</span> <span word="properties">properties</span> <span word="include">include</span> <span word="being">being</span> <span word="monoatomic">monoatomic</span>, <span word="colorless">colorless</span>, <span word="odorless">odorless</span>, <span word="being">being</span> <span word="able">able</span> <span word="to">to</span> <span word="conduct">conduct</span> <span word="electricity">electricity</span>, <span word="and">and</span> <span word="having">having</span> <span word="low">low</span> <span word="chemical">chemical</span> <span word="reactivity">reactivity</span>. <span word="Noble">Noble</span> <span word="gases">gases</span> <span word="include">include</span> <span word="Helium">Helium</span>, <span word="Neon">Neon</span>, <span word="Argon">Argon</span>, <span word="Krypton">Krypton</span>, <span word="Xenon">Xenon</span> <span word="and">and</span> <span word="Radon">Radon</span>. <span word="These">These</span> <span word="are">are</span> <span word="all">all</span> <span word="found">found</span> <span word="in">in</span> <span word="Group">Group</span> 18, <span word="in">in</span> <span word="the">the</span> <span word="rightmost">rightmost</span> <span word="column">column</span> <span word="of">of</span> <span word="the">the</span> <span word="periodic">periodic</span> <span word="table">table</span>. <span word="If">If</span> <span word="you">you</span> <span word="look">look</span> <span word="at">at</span> <span word="the">the</span> <span word="periodic">periodic</span> <span word="table">table</span>, <span word="you">you</span> <span word="will">will</span> <span word="notice">notice</span> <span word="that">that</span> <span word="these">these</span> <span word="elements">elements</span> <span word="are">are</span> <span word="the">the</span> <span word="only">only</span> <span word="ones">ones</span>, <span word="which">which</span> <span word="do">do</span> <span word="not">not</span> <span word="have">have</span> <span word="a">a</span> <span word="charge">charge</span>. <span word="Helium">Helium</span> <span word="has">has</span> <span word="the">the</span> <span word="lowest">lowest</span> <span word="molecular">molecular</span>(分子的)<span word="weight">weight</span> <span word="while">while</span> <span word="Radon">Radon</span> <span word="is">is</span> <span word="the">the</span> <span word="heaviest">heaviest</span>.</p>
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