gre阅读练习每日一篇(四十八)
<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="One">One</span> <span word="of">of</span> <span word="the">the</span> <span word="questions">questions</span> <span word="of">of</span> <span word="interest">interest</span> <span word="in">in</span> <span word="the">the</span> <span word="study">study</span> <span word="of">of</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="spiders">spiders</span> <span word="is">is</span> <span word="whether">whether</span> <span word="the">the</span> <span word="weaving">weaving</span> <span word="of">of</span> <span word="orb">orb</span> <span word="webs">webs</span> <span word="evolved">evolved</span> <span word="only">only</span> <span word="once">once</span> <span word="or">or</span> <span word="several">several</span> <span word="times">times</span>. <span word="About">About</span> <span word="half">half</span> <span word="the">the</span> 35,000 <span word="known">known</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="spiders">spiders</span> <span word="make">make</span> <span word="webs">webs</span>; <span word="a">a</span> <span word="third">third</span> <span word="of">of</span> <span word="the">the</span> <span word="web">web</span> <span word="weavers">weavers</span> <span word="make">make</span> <span word="orb">orb</span> <span word="webs">webs</span>. <span word="Since">Since</span> <span word="most">most</span> <span word="orb">orb</span> <span word="weavers">weavers</span> <span word="belong">belong</span> <span word="either">either</span> <span word="to">to</span> <span word="the">the</span> <span word="Araneidae">Araneidae</span> <span word="or">or</span> <span word="the">the</span> <span word="Uloboridae">Uloboridae</span> <span word="families">families</span>, <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="the">the</span> <span word="orb">orb</span> <span word="web">web</span> <span word="can">can</span> <span word="be">be</span> <span word="determined">determined</span> <span word="only">only</span> <span word="by">by</span> <span word="ascertaining">ascertaining</span> <span word="whether">whether</span> <span word="the">the</span> <span word="families">families</span> <span word="are">are</span> <span word="related">related</span>.</p><p> <span word="Recent">Recent</span> <span word="taxonomic">taxonomic</span> <span word="analysis">analysis</span> <span word="of">of</span> <span word="individuals">individuals</span> <span word="from">from</span> <span word="both">both</span> <span word="families">families</span> <span word="indicates">indicates</span> <span word="that">that</span> <span word="the">the</span> <span word="families">families</span> <span word="evolved">evolved</span> <span word="from">from</span> <span word="different">different</span> <span word="ancestors">ancestors</span>, <span word="thereby">thereby</span> <span word="contradicting">contradicting</span> <span word="Wiehles">Wiehles</span> <span word="theory">theory</span>. <span word="This">This</span> <span word="theory">theory</span> <span word="postulates">postulates</span> <span word="that">that</span> <span word="the">the</span> <span word="families">families</span> <span word="must">must</span> <span word="be">be</span> <span word="related">related</span>, <span word="based">based</span> <span word="on">on</span> <span word="the">the</span> <span word="assumption">assumption</span> <span word="that">that</span> <span word="complex">complex</span> <span word="behavior">behavior</span>, <span word="such">such</span> <span word="as">as</span> <span word="web">web</span> <span word="building">building</span>, <span word="could">could</span> <span word="evolve">evolve</span> <span word="only">only</span> <span word="once">once</span>. <span word="According">According</span> <span word="to">to</span> <span word="Kullman">Kullman</span>, <span word="web">web</span> <span word="structure">structure</span> <span word="is">is</span> <span word="the">the</span> <span word="only">only</span> <span word="characteristic">characteristic</span> <span word="that">that</span> <span word="suggests">suggests</span> <span word="a">a</span> <span word="relationship">relationship</span> <span word="between">between</span> <span word="families">families</span>. <span word="The">The</span> <span word="families">families</span> <span word="differ">differ</span> <span word="in">in</span> <span word="appearance">appearance</span>, <span word="structure">structure</span> <span word="of">of</span> <span word="body">body</span> <span word="hair">hair</span>, <span word="and">and</span> <span word="arrangement">arrangement</span> <span word="of">of</span> <span word="eyes">eyes</span>. <span word="Only">Only</span> <span word="Uloborids">Uloborids</span> <span word="lack">lack</span> <span word="venom">venom</span> <span word="glands">glands</span>. <span word="Further">Further</span> <span word="identification">identification</span> <span word="and">and</span> <span word="study">study</span> <span word="of">of</span> <span word="characteristic">characteristic</span> <span word="features">features</span> <span word="will">will</span> <span word="undoubtedly">undoubtedly</span> <span word="answer">answer</span> <span word="the">the</span> <span word="question">question</span> <span word="of">of</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="the">the</span> <span word="orb">orb</span> <span word="web">web</span>.</p><p> 17. <span word="The">The</span> <span word="primary">primary</span> <span word="purpose">purpose</span> <span word="of">of</span> <span word="the">the</span> <span word="passage">passage</span> <span word="is">is</span> <span word="to">to</span></p>
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