gre考试阅读真题解析(B)
<p> <span word="Recently">Recently</span> <span word="some">some</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="concluded">concluded</span> <span word="that">that</span> <span word="meteorites">meteorites</span> <span word="found">found</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="and">and</span> <span word="long">long</span> <span word="believed">believed</span> <span word="to">to</span> <span word="have">have</span> <span word="a">a</span> <span word="Martian">Martian</span> <span word="origin">origin</span> <span word="might">might</span> <span word="actually">actually</span> <span word="have">have</span> <span word="been">been</span> <span word="blasted">blasted</span> <span word="free">free</span> <span word="of">of</span> <span word="Marss">Marss</span> <span word="gravity">gravity</span> <span word="by">by</span> <span word="the">the</span> <span word="impact">impact</span> <span word="on">on</span> <span word="Mars">Mars</span> <span word="of">of</span> <span word="other">other</span> <span word="meteorites">meteorites</span>. <span word="This">This</span> <span word="conclusion">conclusion</span> <span word="has">has</span> <span word="led">led</span> <span word="to">to</span> <span word="another">another</span> <span word="question">question</span>: <span word="whether">whether</span> <span word="meteorite">meteorite</span> <span word="impacts">impacts</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="have">have</span> <span word="similarly">similarly</span> <span word="driven">driven</span> <span word="rocks">rocks</span> <span word="from">from</span> <span word="this">this</span> <span word="planet">planet</span> <span word="to">to</span> <span word="Mars">Mars</span>.</p><p> <span word="According">According</span> <span word="to">to</span> <span word="astronomer">astronomer</span> <span word="S">S</span>. <span word="A">A</span>. <span word="Phinney">Phinney</span>, <span word="kicking">kicking</span> <span word="a">a</span> <span word="rock">rock</span> <span word="hard">hard</span> <span word="enough">enough</span> <span word="to">to</span> <span word="free">free</span> <span word="it">it</span> <span word="from">from</span> <span word="Earths">Earths</span> <span word="gravity">gravity</span> <span word="would">would</span> <span word="require">require</span> <span word="a">a</span> <span word="meteorite">meteorite</span> <span word="capable">capable</span> <span word="of">of</span> <span word="making">making</span> <span word="a">a</span> <span word="crater">crater</span> <span word="more">more</span> <span word="than">than</span> 60 <span word="miles">miles</span> <span word="across">across</span>. <span word="Moreover">Moreover</span>, <span word="even">even</span> <span word="if">if</span> <span word="Earth">Earth</span> <span word="rocks">rocks</span> <span word="were">were</span> <span word="freed">freed</span> <span word="by">by</span> <span word="meteorite">meteorite</span> <span word="impact">impact</span>, <span word="Marss">Marss</span> <span word="orbit">orbit</span> <span word="is">is</span> <span word="much">much</span> <span word="larger">larger</span> <span word="than">than</span> <span word="Earths">Earths</span>, <span word="so">so</span> <span word="Phinney">Phinney</span> <span word="estimates">estimates</span> <span word="that">that</span> <span word="the">the</span> <span word="probability">probability</span> <span word="of">of</span> <span word="these">these</span> <span word="rocks">rocks</span> <span word="hitting">hitting</span> <span word="Mars">Mars</span> <span word="is">is</span> <span word="about">about</span> <span word="one">one</span>-<span word="tenth">tenth</span> <span word="as">as</span> <span word="great">great</span> <span word="as">as</span> <span word="that">that</span> <span word="of">of</span> <span word="Marss">Marss</span> <span word="rocks">rocks</span> <span word="hitting">hitting</span> <span word="Earth">Earth</span>. <span word="To">To</span> <span word="demonstrate">demonstrate</span> <span word="this">this</span> <span word="estimate">estimate</span>, <span word="Phinney">Phinney</span> <span word="used">used</span> <span word="a">a</span> <span word="computer">computer</span> <span word="to">to</span> <span word="calculate">calculate</span> <span word="where">where</span> 1,000 <span word="hypothetical">hypothetical</span> <span word="particles">particles</span> <span word="would">would</span> <span word="go">go</span> <span word="if">if</span> <span word="ejected">ejected</span> <span word="from">from</span> <span word="Earth">Earth</span> <span word="in">in</span> <span word="random">random</span> <span word="directions">directions</span>. <span word="He">He</span> <span word="found">found</span> <span word="that">that</span> 17 <span word="of">of</span> <span word="the">the</span> 1,000 <span word="particles">particles</span> <span word="would">would</span> <span word="hit">hit</span> <span word="Mars">Mars</span>.</p><p> 17. <span word="The">The</span> <span word="passage">passage</span> <span word="is">is</span> <span word="primarily">primarily</span> <span word="concerned">concerned</span> <span word="with">with</span></p><p> <span word="presenting">presenting</span> <span word="an">an</span> <span word="argument">argument</span> <span word="to">to</span> <span word="support">support</span> <span word="a">a</span> <span word="particular">particular</span> <span word="hypothesis">hypothesis</span></p><p> <span word="suggesting">suggesting</span> <span word="an">an</span> <span word="answer">answer</span> <span word="to">to</span> <span word="a">a</span> <span word="theoretical">theoretical</span> <span word="question">question</span></p><p> <span word="questioning">questioning</span> <span word="the">the</span> <span word="assumptions">assumptions</span> <span word="of">of</span> <span word="a">a</span> <span word="research">research</span> <span word="project">project</span></p><p> <span word="criticizing">criticizing</span> <span word="experimental">experimental</span> <span word="results">results</span></p><p> <span word="explaining">explaining</span> <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="certain">certain</span> <span word="scientific">scientific</span> <span word="data">data</span></p><p> 18. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="passage">passage</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="events">events</span> <span word="may">may</span> <span word="have">have</span> <span word="initiated">initiated</span> <span word="the">the</span> <span word="process">process</span> <span word="that">that</span> <span word="led">led</span> <span word="to">to</span> <span word="the">the</span> <span word="presence">presence</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="of">of</span> <span word="meteorites">meteorites</span> <span word="from">from</span> <span word="Mars">Mars</span>?</p>
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