GRE阅读高频机经原文：飞鼠寻找食物
<p> 22. 飞鼠寻找食物</p><p> <span word="The">The</span> <span word="objective">objective</span> <span word="of">of</span> <span word="this">this</span> <span word="study">study</span> <span word="was">was</span> <span word="to">to</span> <span word="evaluate">evaluate</span> <span word="how">how</span> <span word="northern">northern</span> <span word="flying">flying</span> <span word="squirrels">squirrels</span> <span word="locate">locate</span> <span word="truffles">truffles</span> , <span word="a">a</span> <span word="subterranean">subterranean</span> <span word="and">and</span> <span word="ephemeral">ephemeral</span> <span word="but">but</span> <span word="primary">primary</span> <span word="food">food</span> <span word="source">source</span>. <span word="Thus">Thus</span>, <span word="we">we</span> <span word="evaluated">evaluated</span> <span word="the">the</span> <span word="importance">importance</span> <span word="of">of</span> <span word="three">three</span> <span word="factors">factors</span> <span word="to">to</span> <span word="the">the</span> <span word="foraging">foraging</span> <span word="behavior">behavior</span> <span word="of">of</span> <span word="northern">northern</span> <span word="flying">flying</span> <span word="squirrels">squirrels</span>: <span word="olfactory">olfactory</span> <span word="chemicals">chemicals</span> <span word="that">that</span> <span word="emanate">emanate</span> <span word="from">from</span> <span word="truffles">truffles</span>; <span word="the">the</span> <span word="presence">presence</span> <span word="of">of</span> <span word="coarse">coarse</span> <span word="woody">woody</span> <span word="debris">debris</span> , <span word="which">which</span> <span word="are">are</span> <span word="often">often</span> <span word="associated">associated</span> <span word="with">with</span> <span word="fungi">fungi</span>; <span word="and">and</span> <span word="we">we</span> <span word="explored">explored</span> <span word="the">the</span> <span word="potential">potential</span> <span word="role">role</span> <span word="animal">animal</span> <span word="memory">memory</span> <span word="could">could</span> <span word="play">play</span> <span word="in">in</span> <span word="truffle">truffle</span> <span word="detection">detection</span> <span word="as">as</span> <span word="well">well</span>. <span word="In">In</span> <span word="a">a</span> <span word="foraging">foraging</span> <span word="arena">arena</span>, <span word="squirrels">squirrels</span> <span word="successfully">successfully</span> <span word="retrieved">retrieved</span> <span word="buried">buried</span> <span word="truffles">truffles</span> <span word="that">that</span> <span word="lacked">lacked</span> <span word="aboveground">aboveground</span> <span word="cues">cues</span> <span word="in">in</span> 19 <span word="of">of</span> 30 <span word="trials">trials</span> <span word="and">and</span> <span word="failed">failed</span> <span word="to">to</span> <span word="search">search</span> <span word="near">near</span> <span word="treatments">treatments</span> <span word="that">that</span> <span word="lacked">lacked</span> <span word="truffles">truffles</span> <span word="altogether">altogether</span>, <span word="confirming">confirming</span> <span word="the">the</span> <span word="importance">importance</span> <span word="of">of</span> <span word="olfaction">olfaction</span> <span word="to">to</span> <span word="squirrel">squirrel</span> <span word="foraging">foraging</span>. <span word="However">However</span>, <span word="squirrels">squirrels</span> <span word="also">also</span> <span word="retrieved">retrieved</span> <span word="truffles">truffles</span> <span word="that">that</span> <span word="were">were</span> <span word="associated">associated</span> <span word="most">most</span> <span word="frequently">frequently</span> <span word="with">with</span> <span word="surface">surface</span> <span word="logs">logs</span> . <span word="In">In</span> <span word="addition">addition</span>, <span word="the">the</span> <span word="initial">initial</span> <span word="detection">detection</span> <span word="rate">rate</span> <span word="of">of</span> <span word="the">the</span> <span word="truffle">truffle</span> + <span word="log">log</span> <span word="treatment">treatment</span> <span word="was">was</span> <span word="significantly">significantly</span> <span word="greater">greater</span> <span word="than">than</span> <span word="the">the</span> <span word="truffle">truffle</span>-<span word="only">only</span> <span word="treatment">treatment</span>. <span word="Thus">Thus</span>, <span word="although">although</span> <span word="squirrels">squirrels</span> <span word="search">search</span> <span word="for">for</span> <span word="truffles">truffles</span> <span word="primarily">primarily</span> <span word="using">using</span> <span word="olfaction">olfaction</span>, <span word="they">they</span> <span word="may">may</span> <span word="also">also</span> <span word="benefit">benefit</span> <span word="by">by</span> <span word="searching">searching</span> <span word="near">near</span> <span word="coarse">coarse</span> <span word="woody">woody</span> <span word="debris">debris</span> <span word="on">on</span> <span word="the">the</span> <span word="forest">forest</span> <span word="floor">floor</span> <span word="as">as</span> <span word="an">an</span> <span word="aboveground">aboveground</span> <span word="cue">cue</span> <span word="to">to</span> <span word="truffle">truffle</span> <span word="locations">locations</span>. <span word="In">In</span> <span word="addition">addition</span>, <span word="because">because</span> 82% <span word="of">of</span> <span word="Sierra">Sierra</span> <span word="Nevada">Nevada</span> <span word="truffle">truffle</span>-<span word="fruiting">fruiting</span> <span word="locations">locations</span> <span word="that">that</span> <span word="were">were</span> <span word="marked">marked</span> <span word="in">in</span> 1996 <span word="yielded">yielded</span> <span word="truffles">truffles</span> <span word="again">again</span> <span word="the">the</span> <span word="following">following</span> 2 <span word="years">years</span>, <span word="mycophagous">mycophagous</span> <span word="animals">animals</span> <span word="like">like</span> <span word="northern">northern</span> <span word="flying">flying</span> <span word="squirrels">squirrels</span> <span word="may">may</span> <span word="benefit">benefit</span> <span word="by">by</span> <span word="memorizing">memorizing</span> <span word="fruiting">fruiting</span> <span word="locations">locations</span> <span word="and">and</span> <span word="foraging">foraging</span> <span word="at">at</span> <span word="these">these</span> <span word="same">same</span> <span word="locations">locations</span> <span word="from">from</span> <span word="year">year</span> <span word="to">to</span> <span word="year">year</span>.</p>
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