2009职称英语历年真题c级理工类：阅读判断
<p> 导语：以下英语网为大家整理了全面的职称英语考试历年真题及答案解析，《职称英语考试试题汇总：历年真题及答案解析》供大家参考学习。更多职称英语考试试题敬请关注英语网！</p><p>【推荐】关注英语网微信：<span word="yingyuwang">yingyuwang</span>2013，更快获取真题答案及成绩查询信息。</p><p> 第2部分：阅读判断（第16～22题，每题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="Radiocarbon">Radiocarbon</span> <span word="Dating">Dating</span></p><p> <span word="Nowadays">Nowadays</span> <span word="scientists">scientists</span> <span word="can">can</span> <span word="answer">answer</span> <span word="many">many</span> <span word="questions">questions</span> <span word="about">about</span> <span word="the">the</span> <span word="past">past</span> <span word="through">through</span> <span word="a">a</span> <span word="technique">technique</span> <span word="called">called</span> <span word="radiocarbon">radiocarbon</span> （放射性碳）， <span word="or">or</span> <span word="carbon">carbon</span>-14， <span word="dating">dating</span>. <span word="One">One</span> <span word="key">key</span> <span word="to">to</span> <span word="understanding">understanding</span> <span word="how">how</span> <span word="and">and</span> <span word="by">by</span> <span word="something">something</span> <span word="happened">happened</span> <span word="is">is</span> <span word="to">to</span> <span word="discover">discover</span> <span word="when">when</span> <span word="it">it</span> <span word="happened">happened</span>.</p><p> <span word="Radiocarbon">Radiocarbon</span> <span word="dating">dating</span> <span word="was">was</span> <span word="developed">developed</span> <span word="in">in</span> <span word="the">the</span> <span word="late">late</span> 1940<span word="s">s</span> <span word="by">by</span> <span word="physicist">physicist</span> <span word="Willard">Willard</span> <span word="F">F</span>. <span word="Libby">Libby</span> <span word="at">at</span> <span word="he">he</span> <span word="University">University</span> <span word="of">of</span> <span word="Chicago">Chicago</span>. <span word="An">An</span> <span word="atom">atom</span> <span word="of">of</span> <span word="ordinary">ordinary</span> <span word="carbon">carbon</span>， <span word="called">called</span> <span word="carbon">carbon</span>-12， <span word="has">has</span> <span word="six">six</span> <span word="protons">protons</span>（中子） <span word="and">and</span> <span word="six">six</span> <span word="neutrons">neutrons</span> （质子） <span word="in">in</span> <span word="its">its</span> <span word="nucleus">nucleus</span>. <span word="Carbon">Carbon</span>-14， <span word="or">or</span> <span word="C">C</span>-14， <span word="is">is</span> <span word="a">a</span> <span word="radioactive">radioactive</span>， <span word="unstable">unstable</span> <span word="form">form</span> <span word="of">of</span> <span word="carbon">carbon</span> <span word="that">that</span> <span word="has">has</span> <span word="two">two</span> <span word="extra">extra</span> <span word="neutrons">neutrons</span> （原子核）。 <span word="It">It</span> <span word="returns">returns</span> <span word="to">to</span> <span word="a">a</span> <span word="more">more</span> <span word="stable">stable</span> <span word="form">form</span> <span word="of">of</span> <span word="carbon">carbon</span> <span word="through">through</span> <span word="a">a</span> <span word="process">process</span> <span word="called">called</span> <span word="decay">decay</span> （衰减）。 <span word="This">This</span> <span word="process">process</span> <span word="involves">involves</span> <span word="the">the</span> <span word="loss">loss</span> <span word="of">of</span> <span word="he">he</span> <span word="extra">extra</span> <span word="neutrons">neutrons</span> <span word="and">and</span> <span word="energy">energy</span> <span word="from">from</span> <span word="the">the</span> <span word="nucleus">nucleus</span>.</p>
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