备战英语六级阅读：眼睛磁场感应力
<p> <span word="Birds">Birds</span> <span word="and">and</span> <span word="sea">sea</span> <span word="turtles">turtles</span> <span word="can">can</span> <span word="migrate">migrate</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="miles">miles</span>， <span word="by">by</span> <span word="reading">reading</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="magnetic">magnetic</span> <span word="cues">cues</span>. <span word="But">But</span> <span word="we">we</span> <span word="too">too</span> <span word="might">might</span> <span word="have">have</span> <span word="magnetic">magnetic</span> <span word="sensing">sensing</span> <span word="abilitiesin">abilitiesin</span> <span word="our">our</span> <span word="eyes">eyes</span>. <span word="So">So</span> <span word="says">says</span> <span word="a">a</span> <span word="study">study</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Nature">Nature</span> <span word="Communications">Communications</span>. [<span word="Lauren">Lauren</span> <span word="Foley">Foley</span>， <span word="Robert">Robert</span> <span word="Gegear">Gegear</span> <span word="and">and</span> <span word="Steven">Steven</span> <span word="Reppert">Reppert</span>， <span word="Human">Human</span> <span word="Cryptochrome">Cryptochrome</span> <span word="Exhibits">Exhibits</span> <span word="Light">Light</span>-<span word="Dependent">Dependent</span> <span word="Magnetosensitivity">Magnetosensitivity</span>]</p><p> <span word="Previous">Previous</span> <span word="studies">studies</span> <span word="suggest">suggest</span> <span word="long">long</span>-<span word="distance">distance</span> <span word="migratorsand">migratorsand</span> <span word="even">even</span> <span word="fruit">fruit</span> <span word="fliespick">fliespick</span> <span word="up">up</span> <span word="magnetic">magnetic</span> <span word="fields">fields</span> <span word="with">with</span> <span word="the">the</span> <span word="help">help</span> <span word="of">of</span> <span word="a">a</span> <span word="light">light</span>-<span word="sensitive">sensitive</span> <span word="protein">protein</span> <span word="called">called</span> <span word="cryptochrome">cryptochrome</span>. <span word="We">We</span> <span word="produce">produce</span> <span word="cryptochrome">cryptochrome</span> <span word="toowithout">toowithout</span> <span word="it">it</span>， <span word="our">our</span> <span word="circadian">circadian</span> <span word="clocks">clocks</span> <span word="would">would</span> <span word="break">break</span>. <span word="Human">Human</span> <span word="cryptochrome">cryptochrome</span> <span word="doesnt">doesnt</span> <span word="require">require</span> <span word="light">light</span> <span word="to">to</span> <span word="function">function</span>， <span word="thoughand">thoughand</span> <span word="it">it</span> <span word="doesnt">doesnt</span> <span word="seem">seem</span> <span word="to">to</span> <span word="give">give</span> <span word="us">us</span> <span word="a">a</span> <span word="phenomenal">phenomenal</span> <span word="sensitivity">sensitivity</span> <span word="to">to</span> <span word="magnetic">magnetic</span> <span word="fields">fields</span>. <span word="But">But</span> <span word="can">can</span> <span word="it">it</span> <span word="do">do</span> <span word="more">more</span> <span word="than">than</span> <span word="keep">keep</span> <span word="the">the</span> <span word="circadian">circadian</span> <span word="clock">clock</span> <span word="ticking">ticking</span>?考试大考试大成就你的梦想</p><p> <span word="To">To</span> <span word="find">find</span> <span word="out">out</span>， <span word="researchers">researchers</span> <span word="took">took</span> <span word="out">out</span> <span word="fruit">fruit</span> <span word="flies">flies</span> <span word="usual">usual</span> <span word="cryptochrome">cryptochrome</span> <span word="gene">gene</span> <span word="and">and</span> <span word="inserted">inserted</span> <span word="the">the</span> <span word="human">human</span> <span word="version">version</span>. <span word="And">And</span> <span word="the">the</span> <span word="transgenic">transgenic</span> <span word="flies">flies</span> <span word="had">had</span> <span word="no">no</span> <span word="problem">problem</span> <span word="navigating">navigating</span> <span word="a">a</span> <span word="magnetic">magnetic</span> <span word="maze">maze</span> <span word="when">when</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="lightindicating">lightindicating</span> <span word="the">the</span> <span word="human">human</span> <span word="protein">protein</span> <span word="can">can</span> <span word="still">still</span> <span word="serve">serve</span> <span word="as">as</span> <span word="a">a</span> <span word="light">light</span>-<span word="sensitive">sensitive</span> <span word="magnetic">magnetic</span> <span word="sensor">sensor</span>.</p><p> <span word="We">We</span> <span word="happen">happen</span> <span word="to">to</span> <span word="have">have</span> <span word="a">a</span> <span word="lot">lot</span> <span word="of">of</span> <span word="cryptochrome">cryptochrome</span> <span word="in">in</span> <span word="our">our</span> <span word="retinasideally">retinasideally</span> <span word="situated">situated</span> <span word="to">to</span> <span word="receive">receive</span> <span word="light">light</span>. <span word="Which">Which</span> <span word="suggests">suggests</span> <span word="we">we</span> <span word="might">might</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="see">see</span> <span word="magnetic">magnetic</span> <span word="fields">fields</span> <span word="in">in</span> <span word="some">some</span> <span word="way">way</span>. <span word="On">On</span> <span word="the">the</span> <span word="other">other</span> <span word="hand">hand</span>， <span word="evolution">evolution</span> <span word="might">might</span> <span word="have">have</span> <span word="just">just</span> <span word="given">given</span> <span word="cryptochrome">cryptochrome</span> <span word="a">a</span> <span word="new">new</span> <span word="job">job</span> <span word="in">in</span> <span word="new">new</span> <span word="organisms">organisms</span>. <span word="So">So</span> <span word="dont">dont</span> <span word="throw">throw</span> <span word="away">away</span> <span word="your">your</span> <span word="GPS">GPS</span>.</p><p> </p>
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