英语六级阅读理解每日一练(122日)
<p> 1. <span word="The">The</span> <span word="problem">problem</span> <span word="that">that</span> <span word="has">has</span> <span word="been">been</span> <span word="annoying">annoying</span> <span word="cancer">cancer</span> <span word="researchers">researchers</span> <span word="for">for</span> <span word="years">years</span> <span word="is">is</span> <span word="the">the</span> <span word="difficulty">difficulty</span> <span word="in">in</span> <span word="telling">telling</span> __________</p><p> <span word="how">how</span> <span word="cancer">cancer</span> <span word="cells">cells</span> <span word="are">are</span> <span word="formed">formed</span></p><p> <span word="why">why</span> <span word="cancer">cancer</span> <span word="cells">cells</span> <span word="never">never</span> <span word="stop">stop</span> <span word="dividing">dividing</span></p><p> <span word="why">why</span> <span word="normal">normal</span> <span word="cells">cells</span> <span word="can">can</span> <span word="turn">turn</span> <span word="into">into</span> <span word="cancer">cancer</span> <span word="cells">cells</span></p><p> <span word="how">how</span> <span word="different">different</span> <span word="normal">normal</span> <span word="cells">cells</span> <span word="are">are</span> <span word="from">from</span> <span word="cancer">cancer</span> <span word="cells">cells</span></p><p> 2. <span word="Whiteheads">Whiteheads</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="succeeded">succeeded</span> <span word="in">in</span>__________</p><p> <span word="developing">developing</span> <span word="malignant">malignant</span> <span word="cells">cells</span> <span word="in">in</span> <span word="human">human</span> <span word="bodies">bodies</span></p><p> <span word="making">making</span> <span word="normal">normal</span> <span word="human">human</span> <span word="cells">cells</span> <span word="cancerous">cancerous</span></p><p> <span word="controlling">controlling</span> <span word="the">the</span> <span word="change">change</span> <span word="of">of</span> <span word="human">human</span> <span word="cells">cells</span></p><p> <span word="changing">changing</span> <span word="the">the</span> <span word="genes">genes</span> <span word="of">of</span> <span word="cancer">cancer</span> <span word="cells">cells</span></p><p> 3. <span word="In">In</span> <span word="the">the</span> 1983 <span word="experiment">experiment</span>, <span word="human">human</span> <span word="cells">cells</span> <span word="didnt">didnt</span> <span word="work">work</span> <span word="the">the</span> <span word="way">way</span> <span word="mouse">mouse</span> <span word="cells">cells</span> <span word="did">did</span> <span word="because">because</span> <span word="the">the</span> <span word="former">former</span>__________</p><p> <span word="were">were</span> <span word="easier">easier</span> <span word="to">to</span> <span word="become">become</span> <span word="aged">aged</span></p><p> <span word="checked">checked</span> <span word="telomerase">telomerase</span> <span word="in">in</span> <span word="dividing">dividing</span></p><p> <span word="had">had</span> <span word="short">short</span> <span word="ends">ends</span> <span word="of">of</span> <span word="chromosomes">chromosomes</span></p><p> <span word="lacked">lacked</span> <span word="telomeres">telomeres</span> <span word="for">for</span> <span word="cell">cell</span> <span word="division">division</span></p><p> 4. <span word="To">To</span> <span word="make">make</span> <span word="human">human</span> <span word="cells">cells</span> <span word="more">more</span> <span word="mouse">mouse</span> <span word="like">like</span> <span word="scientists">scientists</span> <span word="tried">tried</span>__________</p><p> <span word="to">to</span> <span word="subject">subject</span> <span word="them">them</span> <span word="to">to</span> <span word="two">two</span> <span word="more">more</span> <span word="genes">genes</span></p><p> <span word="to">to</span> <span word="keep">keep</span> <span word="the">the</span> <span word="division">division</span> <span word="from">from</span> <span word="slowing">slowing</span> <span word="down">down</span></p><p> <span word="to">to</span> <span word="promote">promote</span> <span word="the">the</span> <span word="production">production</span> <span word="of">of</span> <span word="telomerase">telomerase</span></p><p> <span word="to">to</span> <span word="prevent">prevent</span> <span word="excessive">excessive</span> <span word="cells">cells</span> <span word="copying">copying</span></p><p> 5. <span word="One">One</span> <span word="key">key</span> <span word="factor">factor</span> <span word="in">in</span> <span word="creating">creating</span> <span word="tumor">tumor</span> <span word="with">with</span> <span word="human">human</span> <span word="cells">cells</span> <span word="is">is</span> __________</p><p> <span word="lengthening">lengthening</span> <span word="the">the</span> <span word="ends">ends</span> <span word="of">of</span> <span word="chromosomes">chromosomes</span></p><p> <span word="altering">altering</span> <span word="the">the</span> <span word="structure">structure</span> <span word="of">of</span> <span word="telomeres">telomeres</span></p>
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