GRE考试Issue写作范文详解(15)
<p> 编辑点评： 研习<span word="GRE">GRE</span>作文考试的优秀范文不仅可以学到有用的词汇和句子，更能从中学习逻辑的构建方式和作文框架的结构等内容，本文是<span word="GRE">GRE</span>作文考试<span word="Issue">Issue</span>类型的范文，希望对同学们的备考有所帮助。</p><p> <span word="As">As</span> <span word="people">people</span> <span word="grow">grow</span> <span word="older">older</span>, <span word="an">an</span> <span word="enzyme">enzyme</span> <span word="known">known</span> <span word="as">as</span> <span word="PEP">PEP</span> <span word="increasingly">increasingly</span> <span word="breaks">breaks</span> <span word="down">down</span> <span word="the">the</span> <span word="neuropeptide">neuropeptide</span> <span word="chemicals">chemicals</span> <span word="involved">involved</span> <span word="in">in</span> <span word="learning">learning</span> <span word="and">and</span> <span word="memory">memory</span>. <span word="But">But</span> <span word="now">now</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="found">found</span> <span word="compounds">compounds</span> <span word="that">that</span> <span word="prevent">prevent</span> <span word="PEP">PEP</span> <span word="from">from</span> <span word="breaking">breaking</span> <span word="neuropeptides">neuropeptides</span> <span word="apart">apart</span>. <span word="In">In</span> <span word="tests">tests</span>, <span word="these">these</span> <span word="compounds">compounds</span> <span word="almost">almost</span> <span word="completely">completely</span> <span word="restored">restored</span> <span word="lost">lost</span> <span word="memory">memory</span> <span word="in">in</span> <span word="rats">rats</span>. <span word="The">The</span> <span word="use">use</span> <span word="of">of</span> <span word="these">these</span> <span word="compounds">compounds</span> <span word="should">should</span> <span word="be">be</span> <span word="extended">extended</span> <span word="to">to</span> <span word="students">students</span> <span word="who">who</span> <span word="have">have</span> <span word="poor">poor</span> <span word="memory">memory</span> <span word="and">and</span> <span word="difficulty">difficulty</span> <span word="in">in</span> <span word="concentrating">concentrating</span>-<span word="and">and</span> <span word="therefore">therefore</span> <span word="serious">serious</span> <span word="problems">problems</span> <span word="in">in</span> <span word="school">school</span> <span word="performance">performance</span>. <span word="Science">Science</span> <span word="finally">finally</span> <span word="has">has</span> <span word="a">a</span> <span word="solution">solution</span> <span word="for">for</span> <span word="problems">problems</span> <span word="neither">neither</span> <span word="parents">parents</span> <span word="nor">nor</span> <span word="teachers">teachers</span> <span word="could">could</span> <span word="solve">solve</span>.</p><p> <span word="In">In</span> <span word="this">this</span> <span word="argument">argument</span>, <span word="the">the</span> <span word="arguer">arguer</span> <span word="states">states</span> <span word="that">that</span> <span word="researchers">researchers</span> <span word="have">have</span> <span word="found">found</span> <span word="compounds">compounds</span> <span word="that">that</span> <span word="keep">keep</span> <span word="an">an</span> <span word="enzyme">enzyme</span> <span word="known">known</span> <span word="as">as</span> <span word="PEP">PEP</span> <span word="from">from</span> <span word="breaking">breaking</span> <span word="neuropeptides">neuropeptides</span> <span word="apart">apart</span>, <span word="which">which</span> <span word="are">are</span> <span word="known">known</span> <span word="to">to</span> <span word="be">be</span> <span word="involved">involved</span> <span word="in">in</span> <span word="learning">learning</span> <span word="and">and</span> <span word="memory">memory</span>. <span word="The">The</span> <span word="arguer">arguer</span> <span word="states">states</span> <span word="that">that</span> <span word="tests">tests</span> <span word="have">have</span> <span word="shown">shown</span> <span word="that">that</span> <span word="these">these</span> <span word="compounds">compounds</span> <span word="almost">almost</span> <span word="completely">completely</span> <span word="restored">restored</span> <span word="lost">lost</span> <span word="memory">memory</span> <span word="in">in</span> <span word="rats">rats</span>, <span word="and">and</span> <span word="that">that</span> <span word="therefore">therefore</span>, <span word="these">these</span> <span word="compounds">compounds</span> <span word="should">should</span> <span word="be">be</span> <span word="administered">administered</span> <span word="to">to</span> <span word="students">students</span> <span word="with">with</span> <span word="poor">poor</span> <span word="memory">memory</span> <span word="and">and</span> <span word="difficulty">difficulty</span> <span word="in">in</span> <span word="concentrating">concentrating</span>. <span word="This">This</span> <span word="argument">argument</span> <span word="is">is</span> <span word="unconvincing">unconvincing</span> <span word="because">because</span> <span word="it">it</span> <span word="contains">contains</span> <span word="several">several</span> <span word="critical">critical</span> <span word="flaws">flaws</span> <span word="in">in</span> <span word="logic">logic</span>.</p><p> <span word="First">First</span> <span word="of">of</span> <span word="all">all</span>, <span word="the">the</span> <span word="arguer">arguer</span> <span word="states">states</span> <span word="that">that</span> <span word="as">as</span> <span word="people">people</span> <span word="grow">grow</span> <span word="older">older</span>, <span word="PEP">PEP</span> <span word="breaks">breaks</span> <span word="down">down</span> <span word="the">the</span> <span word="neuropeptide">neuropeptide</span> <span word="chemicals">chemicals</span> <span word="that">that</span> <span word="are">are</span> <span word="involved">involved</span> <span word="in">in</span> <span word="learning">learning</span> <span word="and">and</span> <span word="memory">memory</span>. <span word="It">It</span> <span word="is">is</span> <span word="true">true</span> <span word="that">that</span> <span word="generally">generally</span>, <span word="as">as</span> <span word="people">people</span> <span word="get">get</span> <span word="older">older</span>, <span word="they">they</span> <span word="tend">tend</span> <span word="to">to</span> <span word="have">have</span> <span word="more">more</span> <span word="problems">problems</span> <span word="with">with</span> <span word="learning">learning</span> <span word="and">and</span> <span word="memory">memory</span>. <span word="However">However</span>, <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="direct">direct</span> <span word="link">link</span> <span word="mentioned">mentioned</span> <span word="between">between</span> <span word="the">the</span> <span word="breaking">breaking</span> <span word="down">down</span> <span word="of">of</span> <span word="the">the</span> <span word="neuropeptide">neuropeptide</span> <span word="chemicals">chemicals</span> <span word="and">and</span> <span word="the">the</span> <span word="loss">loss</span> <span word="of">of</span> <span word="learning">learning</span> <span word="ability">ability</span> <span word="or">or</span> <span word="memory">memory</span>. <span word="Additionally">Additionally</span>, <span word="the">the</span> <span word="arguer">arguer</span> <span word="mentions">mentions</span> <span word="neuropeptide">neuropeptide</span> <span word="chemicals">chemicals</span> <span word="that">that</span> <span word="are">are</span> <span word="broken">broken</span> <span word="down">down</span> <span word="by">by</span> <span word="PEP">PEP</span>. <span word="What">What</span> <span word="the">the</span> <span word="researchers">researchers</span> <span word="have">have</span> <span word="found">found</span> <span word="is">is</span> <span word="a">a</span> <span word="compound">compound</span> <span word="that">that</span> <span word="prevents">prevents</span> <span word="neuropeptides">neuropeptides</span> <span word="from">from</span> <span word="breaking">breaking</span> <span word="apart">apart</span>. <span word="These">These</span> <span word="are">are</span> <span word="two">two</span> <span word="different">different</span> <span word="physical">physical</span> <span word="actions">actions</span>: <span word="the">the</span> <span word="breaking">breaking</span> <span word="down">down</span> <span word="of">of</span> <span word="neuropeptide">neuropeptide</span> <span word="chemicals">chemicals</span> <span word="as">as</span> <span word="opposed">opposed</span> <span word="to">to</span> <span word="the">the</span> <span word="breaking">breaking</span> <span word="apart">apart</span> <span word="of">of</span> <span word="the">the</span> <span word="neuropeptides">neuropeptides</span> <span word="themselves">themselves</span>. <span word="Furthermore">Furthermore</span>, <span word="it">it</span> <span word="is">is</span> <span word="not">not</span> <span word="stated">stated</span> <span word="which">which</span> <span word="of">of</span> <span word="these">these</span> <span word="physical">physical</span> <span word="actions">actions</span> <span word="is">is</span> <span word="involved">involved</span> <span word="with">with</span> <span word="the">the</span> <span word="loss">loss</span> <span word="of">of</span> <span word="learning">learning</span> <span word="ability">ability</span> <span word="and">and</span> <span word="memory">memory</span>. <span word="It">It</span> <span word="is">is</span> <span word="not">not</span> <span word="explicitly">explicitly</span> <span word="stated">stated</span> <span word="that">that</span> <span word="the">the</span> <span word="breaking">breaking</span> <span word="down">down</span> <span word="of">of</span> <span word="chemicals">chemicals</span> <span word="causes">causes</span> <span word="a">a</span> <span word="loss">loss</span> <span word="in">in</span> <span word="learning">learning</span> <span word="ability">ability</span> <span word="and">and</span> <span word="memory">memory</span>, <span word="only">only</span> <span word="that">that</span> <span word="this">this</span> <span word="happens">happens</span> <span word="as">as</span> <span word="people">people</span> <span word="grow">grow</span> <span word="older">older</span>. <span word="It">It</span> <span word="is">is</span> <span word="also">also</span> <span word="not">not</span> <span word="expressly">expressly</span> <span word="stated">stated</span> <span word="whether">whether</span> <span word="the">the</span> <span word="breaking">breaking</span> <span word="apart">apart</span> <span word="of">of</span> <span word="the">the</span> <span word="neuropeptides">neuropeptides</span> <span word="themselves">themselves</span> <span word="causes">causes</span> <span word="memory">memory</span> <span word="loss">loss</span> <span word="or">or</span> <span word="a">a</span> <span word="lessened">lessened</span> <span word="learning">learning</span> <span word="ability">ability</span>. <span word="Without">Without</span> <span word="showing">showing</span> <span word="a">a</span> <span word="direct">direct</span> <span word="link">link</span> <span word="between">between</span> <span word="the">the</span> <span word="effect">effect</span> <span word="of">of</span> <span word="keeping">keeping</span> <span word="the">the</span> <span word="neuropeptides">neuropeptides</span> <span word="from">from</span> <span word="breaking">breaking</span> <span word="apart">apart</span> <span word="and">and</span> <span word="a">a</span> <span word="reduction">reduction</span> <span word="in">in</span> <span word="the">the</span> <span word="loss">loss</span> <span word="of">of</span> <span word="memory">memory</span> <span word="and">and</span> <span word="learning">learning</span> <span word="ability">ability</span>, <span word="the">the</span> <span word="efficacy">efficacy</span> <span word="of">of</span> <span word="the">the</span> <span word="compounds">compounds</span> <span word="is">is</span> <span word="called">called</span> <span word="into">into</span> <span word="question">question</span>.</p>
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