2015考研英语阅读鸟类的磁性感知能力
<p> <span word="Birds">Birds</span> <span word="magnetic">magnetic</span> <span word="sense">sense</span></p><p> 鸟类的磁性感知能力</p><p> <span word="Columbarian">Columbarian</span> <span word="Columbuses">Columbuses</span></p><p> 禽类新发现</p><p> <span word="Birds">Birds</span> <span word="can">can</span> <span word="navigate">navigate</span> <span word="by">by</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="s">s</span> <span word="magnetic">magnetic</span> <span word="field">field</span>.<span word="How">How</span> <span word="they">they</span> <span word="do">do</span> <span word="it">it</span> <span word="is">is</span> <span word="still">still</span> <span word="a">a</span> <span word="mystery">mystery</span></p><p> 鸟类能够利用地球磁场导航。机理尚不明确</p><p> <span word="WHERE">WHERE</span> <span word="would">would</span> <span word="people">people</span> <span word="be">be</span> <span word="without">without</span> <span word="magnetic">magnetic</span> <span word="compasses">compasses</span>?</p><p> 人类没有指南针会怎样?</p><p> <span word="The">The</span> <span word="short">short</span> <span word="answer">answer</span> <span word="is">is</span>: <span word="lost">lost</span>.</p><p> 很简单：迷失方向。</p><p> <span word="By">By</span> <span word="giving">giving</span> <span word="human">human</span> <span word="beings">beings</span> <span word="a">a</span> <span word="sixth">sixth</span> <span word="sensean">sensean</span> <span word="ability">ability</span> <span word="to">to</span> <span word="detect">detect</span> <span word="the">the</span> <span word="hitherto">hitherto</span> <span word="invisible">invisible</span> <span word="magneticfield">magneticfield</span> <span word="of">of</span> <span word="the">the</span> <span word="Earththe">Earththe</span> <span word="compass">compass</span> <span word="proved">proved</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="most">most</span> <span word="important">important</span> <span word="inventions">inventions</span> <span word="ever">ever</span>.</p><p> 指南针给了人类第6感，使人能辨别地球无形的磁场，成为最重要的发明之一。</p><p> <span word="It">It</span> <span word="let">let</span> <span word="sailors">sailors</span> <span word="navigate">navigate</span> <span word="without">without</span> <span word="sight">sight</span> <span word="of">of</span> <span word="the">the</span> <span word="night">night</span> <span word="sky">sky</span>.</p><p> 海员不用观察夜空便可以辨识方向。</p><p> <span word="And">And</span> <span word="that">that</span> <span word="led">led</span> <span word="to">to</span> <span word="the">the</span> <span word="voyages">voyages</span> <span word="of">of</span> <span word="discovery">discovery</span>, <span word="trade">trade</span> <span word="and">and</span> <span word="conquest">conquest</span> <span word="which">which</span> <span word="created">created</span> <span word="the">the</span> <span word="politicalgeography">politicalgeography</span> <span word="of">of</span> <span word="the">the</span> <span word="modern">modern</span> <span word="world">world</span>.</p><p> 人们用它进行海上探索，海上交易，攻城掠地，进而开创了现代世界的政治版图。</p><p> <span word="Imagine">Imagine</span>, <span word="then">then</span>, <span word="what">what</span> <span word="animals">animals</span> <span word="which">which</span> <span word="had">had</span> <span word="their">their</span> <span word="own">own</span>, <span word="built">built</span>-<span word="in">in</span> <span word="compasses">compasses</span> <span word="could">could</span> <span word="achieve">achieve</span>.</p><p> 有些动物有自己内嵌的指南系统。可以想象得出这些动物的能力。</p>
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