写作：GRE作文ARGUMENT126篇真题四八
<p> ４８、<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> </p>
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