职称英语真题理工2007年B类：阅读判断
<p> 第2部分：阅读判断(第16~22题，第题1分，共7分)</p><p> 下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择<span word="A">A</span>;如果该句提供的是错误信息，请选择<span word="B">B</span>;如果该句的信息文中没有提及，请选择<span word="C">C</span>.</p><p> <span word="Black">Black</span> <span word="Holes">Holes</span></p><p> <span word="Most">Most</span> <span word="scientists">scientists</span> <span word="agree">agree</span> <span word="that">that</span> <span word="black">black</span> <span word="holes">holes</span> <span word="exist">exist</span> <span word="but">but</span> <span word="are">are</span> <span word="nearly">nearly</span> <span word="impossible">impossible</span> <span word="to">to</span> <span word="locate">locate</span>.<span word="A">A</span> <span word="black">black</span> <span word="hole">hole</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="solid">solid</span> <span word="object">object</span>,<span word="like">like</span> <span word="a">a</span> <span word="planet">planet</span>,<span word="but">but</span> <span word="it">it</span> <span word="is">is</span> <span word="shaped">shaped</span> <span word="like">like</span> <span word="a">a</span> <span word="sphere">sphere</span> (球体).<span word="Astronomers">Astronomers</span>(天文学家)<span word="think">think</span> <span word="that">that</span> <span word="at">at</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="a">a</span> <span word="black">black</span> <span word="hole">hole</span> <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="single">single</span> <span word="point">point</span> <span word="in">in</span> <span word="space">space</span> <span word="with">with</span> <span word="infinite">infinite</span>(无限的)<span word="density">density</span>(稠密).<span word="This">This</span> <span word="single">single</span> <span word="point">point</span> <span word="is">is</span> <span word="called">called</span> <span word="a">a</span> <span word="singularity">singularity</span> (奇点).<span word="If">If</span> <span word="the">the</span> <span word="singularity">singularity</span> <span word="theory">theory</span> <span word="is">is</span> <span word="correct">correct</span>,<span word="it">it</span> <span word="means">means</span> <span word="that">that</span> <span word="when">when</span> <span word="a">a</span> <span word="massive">massive</span> <span word="star">star</span> <span word="collapses">collapses</span>,<span word="all">all</span> <span word="the">the</span> <span word="material">material</span> <span word="in">in</span> <span word="it">it</span> <span word="disappears">disappears</span> <span word="into">into</span> <span word="the">the</span> <span word="singularity">singularity</span>.<span word="The">The</span> <span word="center">center</span> <span word="of">of</span> <span word="a">a</span> <span word="black">black</span> <span word="hole">hole</span> <span word="would">would</span> <span word="not">not</span> <span word="really">really</span> <span word="be">be</span> <span word="a">a</span> <span word="hole">hole</span> <span word="at">at</span> <span word="all">all</span>,<span word="but">but</span> <span word="an">an</span> <span word="infinitely">infinitely</span> <span word="dense">dense</span> <span word="point">point</span>.<span word="Anything">Anything</span> <span word="that">that</span> <span word="crosses">crosses</span> <span word="the">the</span> <span word="black">black</span> <span word="hole">hole</span> <span word="is">is</span> <span word="pulled">pulled</span> <span word="in">in</span> <span word="by">by</span> <span word="its">its</span> <span word="great">great</span> <span word="gravity">gravity</span>.</p><p> <span word="Although">Although</span> <span word="black">black</span> <span word="holes">holes</span> <span word="do">do</span> <span word="exist">exist</span>,<span word="they">they</span> <span word="are">are</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="observe">observe</span>.<span word="These">These</span> <span word="are">are</span> <span word="the">the</span> <span word="reasons">reasons</span>.</p><p> ● <span word="No">No</span> <span word="light">light</span> <span word="or">or</span> <span word="anything">anything</span> <span word="else">else</span> <span word="comes">comes</span> <span word="out">out</span> <span word="of">of</span> <span word="black">black</span> <span word="holes">holes</span>.<span word="As">As</span> <span word="a">a</span> <span word="result">result</span>,<span word="they">they</span> <span word="are">are</span> <span word="invisible">invisible</span> <span word="to">to</span> <span word="a">a</span> <span word="telescope">telescope</span>.</p><p> ● <span word="In">In</span> <span word="astronomical">astronomical</span> <span word="terms">terms</span>,<span word="black">black</span> <span word="holes">holes</span> <span word="are">are</span> <span word="truly">truly</span>.<span word="For">For</span> <span word="example">example</span>,<span word="a">a</span> <span word="black">black</span> <span word="hole">hole</span> <span word="formed">formed</span> <span word="by">by</span> <span word="the">the</span> <span word="collapse">collapse</span> <span word="of">of</span> <span word="a">a</span> <span word="giant">giant</span> <span word="star">star</span> <span word="would">would</span> <span word="have">have</span> <span word="an">an</span> <span word="event">event</span> <span word="horizon">horizon</span>(视界)<span word="only">only</span> 18 <span word="miles">miles</span> <span word="across">across</span>.</p>
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