英语六级考试精编阅读理解练习题(2)
<p> 47.<span word="If">If</span> <span word="the">the</span> <span word="drug">drug</span> <span word="proves">proves</span> <span word="effective">effective</span> <span word="in">in</span> <span word="human">human</span> <span word="trials">trials</span>，<span word="it">it</span> <span word="could">could</span> <span word="enhance">enhance</span> <span word="the">the</span> <span word="effectiveness">effectiveness</span> <span word="of">of</span> <span word="existing">existing</span> <span word="AIDS">AIDS</span> <span word="drugs">drugs</span> <span word="in">in</span>___________________.</p><p> 48.<span word="What">What</span> <span word="has">has</span> <span word="become">become</span> <span word="standard">standard</span> <span word="cocktail">cocktail</span> <span word="therapy">therapy</span>?</p><p> 49.<span word="While">While</span> <span word="integrase">integrase</span> <span word="deletes">deletes</span> <span word="an">an</span> <span word="immune">immune</span> <span word="cells">cells</span> <span word="genetic">genetic</span> <span word="material">material</span> <span word="and">and</span> <span word="replaces">replaces</span> <span word="it">it</span> <span word="with">with</span> <span word="its">its</span> <span word="own">own</span>，<span word="it">it</span> <span word="acts">acts</span> <span word="like">like</span>_____________<span word="in">in</span> <span word="a">a</span> <span word="word">word</span> <span word="processor">processor</span>.</p><p> 50.<span word="Why">Why</span> <span word="would">would</span> <span word="anti">anti</span>-<span word="AIDS">AIDS</span> <span word="drugs">drugs</span> <span word="stop">stop</span> <span word="working">working</span>?</p><p> 51.<span word="According">According</span> <span word="to">to</span> <span word="Steven">Steven</span> <span word="Young">Young</span>，<span word="if">if</span> <span word="scientists">scientists</span> <span word="get">get</span> <span word="the">the</span> <span word="data">data</span> <span word="that">that</span>_______，<span word="they">they</span> <span word="would">would</span> <span word="petition">petition</span> <span word="for">for</span> <span word="fast">fast</span> <span word="track">track</span> <span word="status">status</span>.</p><p> </p>
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