GRE阅读考试难句解析（五）
<p> 编辑点评： <span word="GRE">GRE</span>考试中，很多长句难句让考生们困扰不已，本文选择了部分难句给大家稍作分析。</p><p> 32.<span word="One">One</span> <span word="such">such</span> <span word="novel">novel</span> <span word="idea">idea</span> <span word="is">is</span> <span word="that">that</span> <span word="of">of</span> <span word="inserting">inserting</span> <span word="into">into</span> <span word="the">the</span> <span word="chromosomesof">chromosomesof</span> <span word="plants">plants</span> <span word="discrete">discrete</span> <span word="genes">genes</span> <span word="that">that</span> <span word="are">are</span> <span word="not">not</span> <span word="a">a</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="plants">plants</span> <span word="naturalconstitution">naturalconstitution</span>：<span word="specifically">specifically</span>，<span word="the">the</span> <span word="idea">idea</span> <span word="of">of</span> <span word="inserting">inserting</span> <span word="into">into</span> <span word="nonleguminousplants">nonleguminousplants</span> <span word="the">the</span> <span word="genes">genes</span>，<span word="if">if</span> <span word="they">they</span> <span word="can">can</span> <span word="be">be</span> <span word="identified">identified</span> <span word="and">and</span> <span word="isolated">isolated</span>，<span word="that">that</span> <span word="fit">fit</span> <span word="theleguminous">theleguminous</span> <span word="plants">plants</span> <span word="to">to</span> <span word="be">be</span> <span word="hosts">hosts</span> <span word="for">for</span> <span word="nitrogen">nitrogen</span>-<span word="fixing">fixing</span> <span word="bacteria">bacteria</span>. <span word="Hence">Hence</span>，<span word="theintensified">theintensified</span> <span word="research">research</span> <span word="on">on</span> <span word="legumes">legumes</span>.</p><p> 这其中的一个新颖思想就是，在植物的染色体内注入并非是该植物自然构造一个部分的那些不相关联的因基：具体而言，这一思想是，在非豆科植物内注入这样一些基因，倘若这些基因可被辨识出来并被分离开来，而这些基因业已使豆科植物宜于充当那些具备固氮作用的细菌的寄主。由此，对豆科植物的研究日趋深入。</p><p> 33.<span word="It">It</span> <span word="is">is</span> <span word="one">one</span> <span word="of">of</span> <span word="nature">nature</span> <span word="s">s</span> <span word="great">great</span> <span word="ironies">ironies</span> <span word="that">that</span> <span word="the">the</span> <span word="availability">availability</span> <span word="ofnitrogen">ofnitrogen</span> <span word="in">in</span> <span word="the">the</span> <span word="soil">soil</span> <span word="frequently">frequently</span> <span word="sets">sets</span> <span word="an">an</span> <span word="upper">upper</span> <span word="limit">limit</span> <span word="on">on</span> <span word="plant">plant</span> <span word="growtheven">growtheven</span> <span word="though">though</span> <span word="the">the</span> <span word="plants">plants</span> <span word="leaves">leaves</span> <span word="are">are</span> <span word="bathed">bathed</span> <span word="in">in</span> <span word="a">a</span> <span word="sea">sea</span> <span word="of">of</span> <span word="nitrogengas">nitrogengas</span>.下述情形真可谓是自然界的一个莫大讽刺：土壤中所能获得的氮肥量往往对植物的生长构成了一个上限，虽然植物的叶子被沐浴在一片氮气的海洋中。</p><p> 34.<span word="Unless">Unless</span> <span word="they">they</span> <span word="succeed">succeed</span>，<span word="the">the</span> <span word="yield">yield</span> <span word="gains">gains</span> <span word="of">of</span> <span word="the">the</span> <span word="Green">Green</span> <span word="Revolutionwill">Revolutionwill</span> <span word="be">be</span> <span word="largely">largely</span> <span word="lost">lost</span> <span word="even">even</span> <span word="if">if</span> <span word="the">the</span> <span word="genes">genes</span> <span word="in">in</span> <span word="legumes">legumes</span> <span word="that">that</span> <span word="equip">equip</span> <span word="thoseplants">thoseplants</span> <span word="to">to</span> <span word="enter">enter</span> <span word="into">into</span> <span word="a">a</span> <span word="symbiosis">symbiosis</span> <span word="with">with</span> <span word="nitrogen">nitrogen</span> <span word="fixers">fixers</span> <span word="are">are</span> <span word="identifiedand">identifiedand</span> <span word="isolated">isolated</span>，<span word="and">and</span> <span word="even">even</span> <span word="if">if</span> <span word="the">the</span> <span word="transfer">transfer</span> <span word="of">of</span> <span word="those">those</span> <span word="gene">gene</span> <span word="complexes">complexes</span>，<span word="once">once</span> <span word="theyare">theyare</span> <span word="found">found</span>，<span word="becomes">becomes</span> <span word="possible">possible</span>.</p>
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