gre阅读练习每日一篇(四十九)
<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="Theorists">Theorists</span> <span word="are">are</span> <span word="divided">divided</span> <span word="concerning">concerning</span> <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="the">the</span> <span word="Moon">Moon</span>. <span word="Some">Some</span> <span word="hypothesize">hypothesize</span> <span word="that">that</span> <span word="the">the</span> <span word="Moon">Moon</span> <span word="was">was</span> <span word="formed">formed</span> <span word="in">in</span> <span word="the">the</span> <span word="same">same</span> <span word="way">way</span> <span word="as">as</span> <span word="were">were</span> <span word="the">the</span> <span word="planets">planets</span> <span word="in">in</span> <span word="the">the</span> <span word="inner">inner</span> <span word="solar">solar</span> <span word="system">system</span> <span word="from">from</span> <span word="planet">planet</span>-<span word="forming">forming</span> <span word="materials">materials</span> <span word="in">in</span> <span word="the">the</span> <span word="presolar">presolar</span> <span word="nebula">nebula</span>. <span word="But">But</span>, <span word="unlike">unlike</span> <span word="the">the</span> <span word="cores">cores</span> <span word="of">of</span> <span word="the">the</span> <span word="inner">inner</span> <span word="planets">planets</span>, <span word="the">the</span> <span word="Moons">Moons</span> <span word="core">core</span> <span word="contains">contains</span> <span word="little">little</span> <span word="or">or</span> <span word="no">no</span> <span word="iron">iron</span>, <span word="while">while</span> <span word="the">the</span> <span word="typical">typical</span> <span word="planet">planet</span>-<span word="forming">forming</span> <span word="materials">materials</span> <span word="were">were</span> <span word="quite">quite</span> <span word="rich">rich</span> <span word="in">in</span> <span word="iron">iron</span>. <span word="Other">Other</span> <span word="theorists">theorists</span> <span word="propose">propose</span> <span word="that">that</span> <span word="the">the</span> <span word="Moon">Moon</span> <span word="was">was</span> <span word="ripped">ripped</span> <span word="out">out</span> <span word="of">of</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="rocky">rocky</span> <span word="mantle">mantle</span> <span word="by">by</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="collision">collision</span> <span word="with">with</span> <span word="another">another</span> <span word="large">large</span> <span word="celestial">celestial</span> <span word="body">body</span> <span word="after">after</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="iron">iron</span> <span word="fell">fell</span> <span word="to">to</span> <span word="its">its</span> <span word="core">core</span>. <span word="One">One</span> <span word="problem">problem</span> <span word="with">with</span> <span word="the">the</span> <span word="collision">collision</span> <span word="hypothesis">hypothesis</span> <span word="is">is</span> <span word="the">the</span> <span word="question">question</span> <span word="of">of</span> <span word="how">how</span> <span word="a">a</span> <span word="satellite">satellite</span> <span word="formed">formed</span> <span word="in">in</span> <span word="this">this</span> <span word="way">way</span> <span word="could">could</span> <span word="have">have</span> <span word="settled">settled</span> <span word="into">into</span> <span word="the">the</span> <span word="nearly">nearly</span> <span word="circular">circular</span> <span word="orbit">orbit</span> <span word="that">that</span> <span word="the">the</span> <span word="Moon">Moon</span> <span word="has">has</span> <span word="today">today</span>. <span word="Fortunately">Fortunately</span>, <span word="the">the</span> <span word="collision">collision</span> <span word="hypothesis">hypothesis</span> <span word="is">is</span> <span word="testable">testable</span>. <span word="If">If</span> <span word="it">it</span> <span word="is">is</span> <span word="true">true</span>, <span word="the">the</span> <span word="mantlerocks">mantlerocks</span> <span word="of">of</span> <span word="the">the</span> <span word="Moon">Moon</span> <span word="and">and</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="should">should</span> <span word="be">be</span> <span word="the">the</span> <span word="same">same</span> <span word="geochemically">geochemically</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><p> <span word="present">present</span> <span word="two">two</span> <span word="hypotheses">hypotheses</span> <span word="concerning">concerning</span> <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="the">the</span> <span word="Moon">Moon</span></p><p> <span word="discuss">discuss</span> <span word="the">the</span> <span word="strengths">strengths</span> <span word="and">and</span> <span word="weaknesses">weaknesses</span> <span word="of">of</span> <span word="the">the</span> <span word="collision">collision</span> <span word="hypothesis">hypothesis</span> <span word="concerning">concerning</span> <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="the">the</span> <span word="Moon">Moon</span></p><p> <span word="propose">propose</span> <span word="that">that</span> <span word="hypotheses">hypotheses</span> <span word="concerning">concerning</span> <span word="the">the</span> <span word="Moons">Moons</span> <span word="origin">origin</span> <span word="be">be</span> <span word="tested">tested</span></p>
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