如何应对GRE阅读中的取非思想
<p> 在题干中看到虚拟语气，大多需要用到取非思想，与之相对应的一种题型是<span word="GRE">GRE</span>阅读题中常见的一种，叫做改进型取非题。看例子之前，先简单解释下什么是改进型取非题。很简单，如果题干问如果一个对象怎样会更好则是改进型取非题，来看具体的例子：</p><p> 例：<span word="It">It</span> <span word="can">can</span> <span word="be">be</span> <span word="inferred">inferred</span> <span word="from">from</span> <span word="the">the</span> <span word="passage">passage</span> <span word="that">that</span> <span word="the">the</span> <span word="first">first</span> <span word="theories">theories</span> <span word="of">of</span> <span word="grazer">grazer</span> <span word="control">control</span> <span word="mentioned">mentioned</span> <span word="in">in</span> <span word="line">line</span> 3 <span word="would">would</span> <span word="have">have</span> <span word="been">been</span> <span word="more">more</span> <span word="convincing">convincing</span> <span word="if">if</span> <span word="researchers">researchers</span> <span word="had">had</span> <span word="been">been</span> <span word="able">able</span> <span word="to">to</span>,这是一个典型的改进型取非题题干，问的是第三行第一个理论怎样会更好。</p><p> 逻辑思路：既然是改进，原文肯定说到了它的不好之处或者有<span word="unless">unless</span>的句子，我们把造成不好的原因取非，就是所要的答案了。</p><p> 按照此思路定位原文三行，看到后面有这样一句话<span word="A">A</span> <span word="low">low</span> <span word="number">number</span> <span word="of">of</span> <span word="algal">algal</span> <span word="cells">cells</span> <span word="in">in</span> <span word="the">the</span> <span word="presence">presence</span> <span word="of">of</span> <span word="a">a</span> <span word="high">high</span> <span word="number">number</span> <span word="of">of</span> <span word="grazers">grazers</span> <span word="suggested">suggested</span>, <span word="but">but</span> <span word="did">did</span> <span word="not">not</span> <span word="prove">prove</span>, <span word="that">that</span> <span word="the">the</span> <span word="grazers">grazers</span> <span word="had">had</span> <span word="removed">removed</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="algae">algae</span>.注意看插入语部分的<span word="but">but</span> <span word="did">did</span> <span word="not">not</span> <span word="prove">prove</span>，这个就是缺点，取非就是<span word="prove">prove</span>再看五个选项：</p><p> <span word="observe">observe</span> <span word="high">high</span> <span word="phytoplankton">phytoplankton</span> <span word="numbers">numbers</span> <span word="under">under</span> <span word="natural">natural</span> <span word="lake">lake</span> <span word="conditions">conditions</span></p><p> <span word="discover">discover</span> <span word="negative">negative</span> <span word="correlations">correlations</span> <span word="between">between</span> <span word="algae">algae</span> <span word="and">and</span> <span word="zooplankton">zooplankton</span> <span word="numbers">numbers</span> <span word="from">from</span> <span word="their">their</span> <span word="field">field</span> <span word="research">research</span></p><p> <span word="understand">understand</span> <span word="the">the</span> <span word="central">central</span> <span word="importance">importance</span> <span word="of">of</span> <span word="environmental">environmental</span> <span word="factors">factors</span> <span word="in">in</span> <span word="controlling">controlling</span> <span word="the">the</span> <span word="growth">growth</span> <span word="rates">rates</span> <span word="of">of</span> <span word="phytoplankton">phytoplankton</span></p>
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