历年GRE阅读材料中的难句精选100句(十)
<p> 91、 <span word="For">For</span> <span word="one">one</span> <span word="thing">thing</span>, <span word="no">no</span> <span word="population">population</span> <span word="can">can</span> <span word="be">be</span> <span word="driven">driven</span> <span word="entirely">entirely</span> <span word="by">by</span> <span word="density">density</span>-<span word="independent">independent</span> <span word="factors">factors</span> <span word="all">all</span> <span word="the">the</span> <span word="time">time</span>.难句类型：正话反说</p><p> 请思考：如果文中说这句话的前提是：<span word="all">all</span> <span word="population">population</span> <span word="are">are</span> <span word="driven">driven</span> <span word="by">by</span> <span word="two">two</span> <span word="categories">categories</span> <span word="of">of</span> <span word="growth">growth</span> <span word="parameters">parameters</span>, <span word="one">one</span> <span word="is">is</span> <span word="density">density</span>-<span word="independent">independent</span> <span word="factors">factors</span>, <span word="and">and</span> <span word="the">the</span> <span word="other">other</span> <span word="is">is</span> <span word="density">density</span>-<span word="independent">independent</span> <span word="factors">factors</span>. 那么作者说上面的这句话有什么用意。</p><p> 解释：本句虽然貌不惊人，但本书既然将其收录进来，并标出难度5，就意味着其中有怪异之处。值得一提的是，本文前面曾把控制种群密度的因素分为两种，一种叫做<span word="density">density</span>-<span word="dependent">dependent</span> <span word="factors">factors</span>，另一种叫做<span word="dentsity">dentsity</span>-<span word="independent">independent</span> <span word="factors">factors</span>。原文的直译虽然好懂，但是总令人感觉说得不甚明白。显然，<span word="GRE">GRE</span>或<span word="GMAT">GMAT</span>的作者不可能随便说一句无关痛痒的话，那么没有任何种群能够在所有的时间全被<span word="d">d</span>-<span word="I">I</span>因素所控制，其真正意思是什么呢?就是：一切种群都必然在某个时间内受到<span word="d">d</span>-<span word="d">d</span>因素的控制。本句是<span word="ETS">ETS</span>在考试中惯用的正话反说的典型例子，请读者深沉体会。本句在文章中也是理解作者态度的关键所在。</p><p> 意群训练：<span word="For">For</span> <span word="one">one</span> <span word="thing">thing</span>, <span word="no">no</span> <span word="population">population</span> <span word="can">can</span> <span word="be">be</span> <span word="driven">driven</span> <span word="entirely">entirely</span> <span word="by">by</span> <span word="density">density</span>-<span word="independent">independent</span> <span word="factors">factors</span> <span word="all">all</span> <span word="the">the</span> <span word="time">time</span>.</p><p> 92、 <span word="In">In</span> <span word="order">order</span> <span word="to">to</span> <span word="understand">understand</span> <span word="the">the</span> <span word="nature">nature</span> <span word="of">of</span> <span word="the">the</span> <span word="ecologists">ecologists</span> <span word="investigation">investigation</span>，<span word="we">we</span> <span word="may">may</span> <span word="think">think</span> <span word="of">of</span> <span word="the">the</span> <span word="density">density</span>-<span word="dependent">dependent</span> <span word="effects">effects</span> <span word="on">on</span> <span word="growth">growth</span> <span word="parameters">parameters</span> <span word="as">as</span> <span word="the">the</span> <span word="signal">signal</span> <span word="ecologists">ecologists</span> <span word="are">are</span> <span word="trying">trying</span> <span word="to">to</span> <span word="isolate">isolate</span> <span word="and">and</span> <span word="interpret">interpret</span>，<span word="one">one</span> <span word="that">that</span> <span word="tends">tends</span> <span word="to">to</span> <span word="make">make</span> <span word="the">the</span> <span word="population">population</span> <span word="increase">increase</span> <span word="from">from</span> <span word="relatively">relatively</span> <span word="low">low</span> <span word="values">values</span> <span word="or">or</span> <span word="decrease">decrease</span> <span word="from">from</span> <span word="relatively">relatively</span> <span word="high">high</span> <span word="ones">ones</span>，<span word="while">while</span> <span word="the">the</span> <span word="density">density</span>-<span word="independent">independent</span> <span word="effects">effects</span> <span word="act">act</span> <span word="to">to</span> <span word="produce">produce</span> <span word="noise">noise</span> <span word="in">in</span> <span word="the">the</span> <span word="population">population</span> <span word="dynamics">dynamics</span>.</p>
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