gre阅读练习每日一篇(二十五)
<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="A">A</span> <span word="mysterious">mysterious</span> <span word="phenomenon">phenomenon</span> <span word="is">is</span> <span word="the">the</span> <span word="ability">ability</span> <span word="of">of</span> <span word="over">over</span>-<span word="water">water</span> <span word="migrants">migrants</span> <span word="to">to</span> <span word="travel">travel</span> <span word="on">on</span> <span word="course">course</span>. <span word="Birds">Birds</span>, <span word="bees">bees</span>, <span word="and">and</span> <span word="other">other</span> <span word="species">species</span> <span word="can">can</span> <span word="keep">keep</span> <span word="track">track</span> <span word="of">of</span> <span word="time">time</span> <span word="without">without</span> <span word="any">any</span> <span word="sensory">sensory</span> <span word="cues">cues</span> <span word="from">from</span> <span word="the">the</span> <span word="outside">outside</span> <span word="world">world</span>, <span word="and">and</span> <span word="such">such</span> <span word="biological">biological</span> <span word="clocks">clocks</span> <span word="clearly">clearly</span> <span word="contribute">contribute</span> <span word="to">to</span> <span word="their">their</span> <span word="compass">compass</span> <span word="sense">sense</span>. <span word="For">For</span> <span word="example">example</span>, <span word="they">they</span> <span word="can">can</span> <span word="use">use</span> <span word="the">the</span> <span word="position">position</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="or">or</span> <span word="stars">stars</span>, <span word="along">along</span> <span word="with">with</span> <span word="the">the</span> <span word="time">time</span> <span word="of">of</span> <span word="day">day</span> , <span word="to">to</span> <span word="find">find</span> <span word="north">north</span>. <span word="But">But</span> <span word="compass">compass</span> <span word="sense">sense</span> <span word="alone">alone</span> <span word="cannot">cannot</span> <span word="explain">explain</span> <span word="how">how</span> <span word="birds">birds</span> <span word="navigate">navigate</span> <span word="the">the</span> <span word="ocean">ocean</span>: <span word="after">after</span> <span word="a">a</span> <span word="flock">flock</span> <span word="traveling">traveling</span> <span word="east">east</span> <span word="is">is</span> <span word="blown">blown</span> <span word="far">far</span> <span word="south">south</span> <span word="by">by</span> <span word="a">a</span> <span word="storm">storm</span>, <span word="it">it</span> <span word="will">will</span> <span word="assume">assume</span> <span word="the">the</span> <span word="proper">proper</span> <span word="northeasterly">northeasterly</span> <span word="course">course</span> <span word="to">to</span> <span word="compensate">compensate</span>. <span word="Perhaps">Perhaps</span>, <span word="some">some</span> <span word="scientists">scientists</span> <span word="thought">thought</span>, <span word="migrants">migrants</span> <span word="determine">determine</span> <span word="their">their</span> <span word="geographic">geographic</span> <span word="position">position</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="by">by</span> <span word="celestial">celestial</span> <span word="navigation">navigation</span>, <span word="almost">almost</span> <span word="as">as</span> <span word="human">human</span> <span word="navigators">navigators</span> <span word="use">use</span> <span word="stars">stars</span> <span word="and">and</span> <span word="planets">planets</span>, <span word="but">but</span> <span word="this">this</span> <span word="would">would</span> <span word="demand">demand</span> <span word="of">of</span> <span word="the">the</span> <span word="animals">animals</span> <span word="a">a</span> <span word="fantastic">fantastic</span> <span word="map">map</span> <span word="sense">sense</span>. <span word="Researchers">Researchers</span> <span word="now">now</span> <span word="know">know</span> <span word="that">that</span> <span word="some">some</span> <span word="species">species</span> <span word="have">have</span> <span word="a">a</span> <span word="magnetic">magnetic</span> <span word="sense">sense</span>, <span word="which">which</span> <span word="might">might</span> <span word="allow">allow</span> <span word="migrants">migrants</span> <span word="to">to</span> <span word="determine">determine</span> <span word="their">their</span> <span word="geographic">geographic</span> <span word="location">location</span> <span word="by">by</span> <span word="detecting">detecting</span> <span word="variations">variations</span> <span word="in">in</span> <span word="the">the</span> <span word="strength">strength</span> <span word="of">of</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="magnetic">magnetic</span> <span word="field">field</span>.</p><p> 17. <span word="The">The</span> <span word="main">main</span> <span word="idea">idea</span> <span word="of">of</span> <span word="the">the</span> <span word="passage">passage</span> <span word="is">is</span> <span word="that">that</span></p><p> <span word="migration">migration</span> <span word="over">over</span> <span word="land">land</span> <span word="requires">requires</span> <span word="a">a</span> <span word="simpler">simpler</span> <span word="explanation">explanation</span> <span word="than">than</span> <span word="migration">migration</span> <span word="over">over</span> <span word="water">water</span> <span word="does">does</span></p><p> <span word="the">the</span> <span word="means">means</span> <span word="by">by</span> <span word="which">which</span> <span word="animals">animals</span> <span word="migrate">migrate</span> <span word="over">over</span> <span word="water">water</span> <span word="are">are</span> <span word="complex">complex</span> <span word="and">and</span> <span word="only">only</span> <span word="partly">partly</span> <span word="understood">understood</span></p>
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