GRE阅读高频机经原文及答案：胡蜂吃天牛
<p> 37. 胡蜂吃天牛</p><p> <span word="Stem">Stem</span> <span word="borers">borers</span> <span word="are">are</span> <span word="insect">insect</span> <span word="pests">pests</span> <span word="that">that</span> <span word="often">often</span> <span word="ruin">ruin</span> <span word="North">North</span> <span word="American">American</span> <span word="corn">corn</span> <span word="crops">crops</span>. <span word="On">On</span> <span word="some">some</span> <span word="other">other</span> <span word="continents">continents</span>, <span word="crop">crop</span> <span word="damage">damage</span> <span word="by">by</span> <span word="stem">stem</span> <span word="borers">borers</span> <span word="is">is</span> <span word="controlled">controlled</span> <span word="by">by</span> <span word="a">a</span> <span word="certain">certain</span> <span word="species">species</span> <span word="of">of</span> <span word="wasp">wasp</span>. <span word="Since">Since</span> <span word="these">these</span> <span word="wasps">wasps</span> <span word="eat">eat</span> <span word="nothing">nothing</span> <span word="but">but</span> <span word="stem">stem</span> <span word="borers">borers</span>, <span word="importing">importing</span> <span word="them">them</span> <span word="into">into</span> <span word="North">North</span> <span word="America">America</span> <span word="will">will</span> <span word="keep">keep</span> <span word="crop">crop</span> <span word="damage">damage</span> <span word="from">from</span> <span word="stem">stem</span> <span word="borers">borers</span> <span word="under">under</span> <span word="control">control</span> <span word="without">without</span> <span word="endangering">endangering</span> <span word="other">other</span> <span word="North">North</span> <span word="American">American</span> <span word="insect">insect</span> <span word="species">species</span>.</p><p> <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="is">is</span> <span word="an">an</span> <span word="assumption">assumption</span> <span word="on">on</span> <span word="which">which</span> <span word="the">the</span> <span word="argument">argument</span> <span word="depends">depends</span>?</p><p> <span word="Corn">Corn</span> <span word="is">is</span> <span word="the">the</span> <span word="principal">principal</span> <span word="food">food</span> <span word="of">of</span> <span word="stem">stem</span> <span word="borers">borers</span> <span word="that">that</span> <span word="live">live</span> <span word="on">on</span> <span word="continents">continents</span> <span word="other">other</span> <span word="than">than</span> <span word="North">North</span> <span word="America">America</span>.</p><p> <span word="The">The</span> <span word="wasps">wasps</span> <span word="are">are</span> <span word="capable">capable</span> <span word="of">of</span> <span word="surviving">surviving</span> <span word="in">in</span> <span word="North">North</span> <span word="America">America</span> <span word="long">long</span> <span word="enough">enough</span> <span word="to">to</span> <span word="eat">eat</span> <span word="significant">significant</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="stem">stem</span> <span word="borers">borers</span>.</p><p> <span word="No">No</span> <span word="wasp">wasp</span> <span word="in">in</span> <span word="North">North</span> <span word="America">America</span> <span word="is">is</span> <span word="closely">closely</span> <span word="related">related</span> <span word="to">to</span> <span word="the">the</span> <span word="species">species</span> <span word="of">of</span> <span word="wasp">wasp</span> <span word="that">that</span> <span word="eats">eats</span> <span word="stem">stem</span> <span word="borers">borers</span>.</p><p> <span word="On">On</span> <span word="continent">continent</span> <span word="other">other</span> <span word="than">than</span> <span word="North">North</span> <span word="America">America</span>, <span word="the">the</span> <span word="wasps">wasps</span> <span word="control">control</span> <span word="stem">stem</span> <span word="borers">borers</span> <span word="more">more</span> <span word="effectively">effectively</span> <span word="than">than</span> <span word="does">does</span> <span word="any">any</span> <span word="other">other</span> <span word="pest">pest</span> <span word="control">control</span></p><p> <span word="measure">measure</span>.</p><p> <span word="Corn">Corn</span> <span word="crops">crops</span> <span word="on">on</span> <span word="continents">continents</span> <span word="other">other</span> <span word="than">than</span> <span word="North">North</span> <span word="America">America</span> <span word="are">are</span> <span word="not">not</span> <span word="damaged">damaged</span> <span word="by">by</span> <span word="any">any</span> <span word="insect">insect</span> <span word="pests">pests</span> <span word="other">other</span> <span word="than">than</span> <span word="stem">stem</span> <span word="borers">borers</span>.</p><p> 答案：<span word="B">B</span></p><p> </p>
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