gre阅读练习每日一篇(五十四)
<p> 掌握了<span word="gre">gre</span>阅读里的长难句，到了实战演习的时候了。<span word="gre">gre</span>阅读练习每日一篇帮助<span word="gre">gre</span>考生循序渐进地进行练习和总结。希望<span word="gre">gre</span>考生在进行<span word="gre">gre</span>阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。</p><p> <span word="The">The</span> <span word="transplantation">transplantation</span> <span word="of">of</span> <span word="organs">organs</span> <span word="from">from</span> <span word="one">one</span> <span word="individual">individual</span> <span word="to">to</span> <span word="another">another</span> <span word="normally">normally</span> <span word="involves">involves</span> <span word="two">two</span> <span word="major">major</span> <span word="problems">problems</span>: <span word="organ">organ</span> <span word="rejection">rejection</span> <span word="is">is</span> <span word="likely">likely</span> <span word="unless">unless</span> <span word="the">the</span> <span word="transplantation">transplantation</span> <span word="antigens">antigens</span> <span word="capable">capable</span> <span word="of">of</span> <span word="stimulating">stimulating</span> <span word="an">an</span> <span word="immune">immune</span> <span word="response">response</span>) <span word="of">of</span> <span word="both">both</span> <span word="individuals">individuals</span> <span word="are">are</span> <span word="nearly">nearly</span> <span word="identical">identical</span>, <span word="and">and</span> <span word="the">the</span> <span word="introduction">introduction</span> <span word="of">of</span> <span word="any">any</span> <span word="unmatched">unmatched</span> <span word="transplantation">transplantation</span> <span word="antigens">antigens</span> <span word="induces">induces</span> <span word="the">the</span> <span word="development">development</span> <span word="by">by</span> <span word="the">the</span> <span word="recipient">recipient</span> <span word="of">of</span> <span word="donor">donor</span>-<span word="specific">specific</span> <span word="lymphocytes">lymphocytes</span> <span word="that">that</span> <span word="will">will</span> <span word="produce">produce</span> <span word="violent">violent</span> <span word="rejection">rejection</span> <span word="of">of</span> <span word="further">further</span> <span word="transplantations">transplantations</span> <span word="from">from</span> <span word="that">that</span> <span word="donor">donor</span>. <span word="However">However</span>, <span word="we">we</span> <span word="have">have</span> <span word="found">found</span> <span word="that">that</span> <span word="among">among</span> <span word="many">many</span> <span word="strains">strains</span> <span word="of">of</span> <span word="rats">rats</span> <span word="these">these</span> <span word="normal">normal</span> <span word="rules">rules</span> <span word="of">of</span> <span word="transplantation">transplantation</span> <span word="are">are</span> <span word="not">not</span> <span word="obeyed">obeyed</span> <span word="by">by</span> <span word="liver">liver</span> <span word="transplants">transplants</span>. <span word="Not">Not</span> <span word="only">only</span> <span word="are">are</span> <span word="liver">liver</span> <span word="transplants">transplants</span> <span word="never">never</span> <span word="rejected">rejected</span>, <span word="but">but</span> <span word="they">they</span> <span word="even">even</span> <span word="induce">induce</span> <span word="a">a</span> <span word="state">state</span> <span word="of">of</span> <span word="donor">donor</span>-<span word="specific">specific</span> <span word="unresponsiveness">unresponsiveness</span> <span word="in">in</span> <span word="which">which</span> <span word="subsequent">subsequent</span> <span word="transplants">transplants</span> <span word="of">of</span> <span word="other">other</span> <span word="organs">organs</span>, <span word="such">such</span> <span word="as">as</span> <span word="skin">skin</span>, <span word="from">from</span> <span word="that">that</span> <span word="donor">donor</span> <span word="are">are</span> <span word="accepted">accepted</span> <span word="permanently">permanently</span>. <span word="Our">Our</span> <span word="hypothesis">hypothesis</span> <span word="is">is</span> <span word="that">that</span> <span word="many">many</span> <span word="strains">strains</span> <span word="of">of</span> <span word="rats">rats</span> <span word="simply">simply</span> <span word="cannot">cannot</span> <span word="mount">mount</span> <span word="a">a</span> <span word="sufficiently">sufficiently</span> <span word="vigorous">vigorous</span> <span word="destructive">destructive</span> <span word="immune">immune</span>-<span word="response">response</span> <span word="to">to</span> <span word="outstrip">outstrip</span> <span word="the">the</span> <span word="livers">livers</span> <span word="relatively">relatively</span> <span word="great">great</span> <span word="capacity">capacity</span> <span word="to">to</span> <span word="protect">protect</span> <span word="itself">itself</span> <span word="from">from</span> <span word="immune">immune</span>-<span word="response">response</span> <span word="damage">damage</span> <span word="and">and</span> <span word="that">that</span> <span word="the">the</span> <span word="systemic">systemic</span> <span word="unresponsiveness">unresponsiveness</span> <span word="observed">observed</span> <span word="is">is</span> <span word="due">due</span> <span word="to">to</span> <span word="concentration">concentration</span> <span word="of">of</span> <span word="the">the</span> <span word="recipients">recipients</span> <span word="donor">donor</span>-<span word="specific">specific</span> <span word="lymphocytes">lymphocytes</span> <span word="at">at</span> <span word="the">the</span> <span word="site">site</span> <span word="of">of</span> <span word="the">the</span> <span word="liver">liver</span> <span word="transplant">transplant</span>.</p>
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