2017版【高考一本解决方案】高考英语（新课标版）考点题组训练：专题13 七选五（含解析）
<p> (2016·新课标Ⅰ)</p><p> 主题：密码的设置 词数：192</p><p> (密码)<span word="keep">keep</span> <span word="messages">messages</span> <span word="private">private</span>.<span word="Banks">Banks</span> <span word="use">use</span> <span word="secret">secret</span> <span word="codes">codes</span> <span word="in">in</span> <span word="doing">doing</span> <span word="business">business</span>，<span word="especially">especially</span> <span word="when">when</span> <span word="information">information</span> <span word="is">is</span> <span word="sent">sent</span> <span word="by">by</span> <span word="computer">computer</span>.</p><p> <span word="People">People</span> <span word="have">have</span> <span word="used">used</span> <span word="secret">secret</span> <span word="codes">codes</span> <span word="for">for</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="years">years</span>.__1__ <span word="Code">Code</span> <span word="breaking">breaking</span> <span word="never">never</span> <span word="lags">lags</span>(落后)<span word="far">far</span> <span word="behind">behind</span> <span word="code">code</span> <span word="making">making</span>.<span word="The">The</span> <span word="science">science</span> <span word="of">of</span> <span word="creating">creating</span> <span word="and">and</span> <span word="reading">reading</span> <span word="coded">coded</span> <span word="messages">messages</span> <span word="is">is</span> <span word="called">called</span> <span word="cryptography">cryptography</span>.</p><p> __2__ <span word="For">For</span> <span word="example">example</span>，<span word="the">the</span> <span word="first">first</span> <span word="letters">letters</span> <span word="of">of</span> “<span word="My">My</span> <span word="elephant">elephant</span> <span word="eats">eats</span> <span word="too">too</span> <span word="many">many</span> <span word="eels">eels</span>” <span word="spell">spell</span> <span word="out">out</span> <span word="the">the</span> <span word="hidden">hidden</span> <span word="message">message</span> “<span word="Meet">Meet</span> <span word="me">me</span>.”</p><p> __3__ <span word="You">You</span> <span word="might">might</span> <span word="represent">represent</span> <span word="each">each</span> <span word="letter">letter</span> <span word="with">with</span> <span word="a">a</span> <span word="number">number</span>，<span word="for">for</span> <span word="example">example</span>.<span word="Let">Let</span>'<span word="s">s</span> <span word="number">number</span> <span word="the">the</span> <span word="letters">letters</span> <span word="of">of</span> <span word="the">the</span> <span word="alphabet">alphabet</span>，<span word="in">in</span> <span word="order">order</span>，<span word="from">from</span> 1 <span word="to">to</span> 26.<span word="If">If</span> <span word="we">we</span> <span word="substitute">substitute</span> <span word="a">a</span> <span word="number">number</span> <span word="for">for</span> <span word="each">each</span> <span word="letter">letter</span>，<span word="the">the</span> <span word="message">message</span> “<span word="Meet">Meet</span> <span word="me">me</span>” <span word="would">would</span> <span word="read">read</span> “13 5 5 20 13 5.”</p><p> <span word="A">A</span> <span word="code">code</span> <span word="uses">uses</span> <span word="symbols">symbols</span> <span word="to">to</span> <span word="replace">replace</span> <span word="words">words</span>，<span word="phrases">phrases</span>，<span word="or">or</span> <span word="sentences">sentences</span>.<span word="To">To</span> <span word="read">read</span> <span word="the">the</span> <span word="message">message</span> <span word="of">of</span> <span word="a">a</span> <span word="real">real</span> <span word="code">code</span>，<span word="you">you</span> <span word="must">must</span> <span word="have">have</span> <span word="a">a</span> <span word="code">code</span> <span word="book">book</span>.__4__ <span word="For">For</span> <span word="example">example</span>，“<span word="bridge">bridge</span>” <span word="might">might</span> <span word="stand">stand</span> <span word="for">for</span> “<span word="meet">meet</span>” <span word="and">and</span> “<span word="out">out</span>” <span word="might">might</span> <span word="stand">stand</span> <span word="for">for</span> “<span word="me">me</span>”．<span word="The">The</span> <span word="message">message</span> “<span word="Bridge">Bridge</span> <span word="out">out</span>” <span word="would">would</span> <span word="actually">actually</span> <span word="mean">mean</span> “<span word="Meet">Meet</span> <span word="me">me</span>.” __5__ <span word="However">However</span>，<span word="it">it</span> <span word="is">is</span> <span word="also">also</span> <span word="hard">hard</span> <span word="to">to</span> <span word="keep">keep</span> <span word="a">a</span> <span word="code">code</span> <span word="book">book</span> <span word="secret">secret</span> <span word="for">for</span> <span word="long">long</span>.<span word="So">So</span> <span word="codes">codes</span> <span word="must">must</span> <span word="be">be</span> <span word="changed">changed</span> <span word="frequently">frequently</span>.</p><p> <span word="A">A</span>．<span word="It">It</span> <span word="is">is</span> <span word="very">very</span> <span word="hard">hard</span> <span word="to">to</span> <span word="break">break</span> <span word="a">a</span> <span word="code">code</span> <span word="without">without</span> <span word="the">the</span> <span word="code">code</span> <span word="book">book</span>.</p><p> <span word="B">B</span>．<span word="In">In</span> <span word="any">any</span> <span word="language">language</span>，<span word="some">some</span> <span word="letters">letters</span> <span word="are">are</span> <span word="used">used</span> <span word="more">more</span> <span word="than">than</span> <span word="others">others</span>.</p><p> <span word="C">C</span>．<span word="Only">Only</span> <span word="people">people</span> <span word="who">who</span> <span word="know">know</span> <span word="the">the</span> <span word="keyword">keyword</span> <span word="can">can</span> <span word="read">read</span> <span word="the">the</span> <span word="message">message</span>.</p><p> <span word="D">D</span>．<span word="As">As</span> <span word="long">long</span> <span word="as">as</span> <span word="there">there</span> <span word="have">have</span> <span word="been">been</span> <span word="codes">codes</span>，<span word="people">people</span> <span word="have">have</span> <span word="tried">tried</span> <span word="to">to</span> <span word="break">break</span> <span word="them">them</span>.</p>
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