gre阅读全真题解读剖析：鸟叫研究
<p> 新<span word="GRE">GRE</span>考试非常人性的一点，对于考题出的很严格，经过多次锤炼之后，能考验出考生们的水平。考生们可以根据题库的题目复习新<span word="GRE">GRE</span>考试，下面就将新<span word="GRE">GRE</span>阅读理解真题进行解析，为考生们彻底分析在<span word="GRE">GRE</span>阅读中出现的真题，帮助考生们复习。</p><p> 17. 鸟叫研究</p><p> <span word="Over">Over</span> <span word="the">the</span> <span word="years">years</span>, <span word="biologists">biologists</span> <span word="have">have</span> <span word="suggested">suggested</span> <span word="two">two</span> <span word="main">main</span> <span word="pathways">pathways</span> <span word="by">by</span> <span word="which">which</span> <span word="sexual">sexual</span> <span word="selection">selection</span> <span word="may">may</span> <span word="have">have</span> <span word="shaped">shaped</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="male">male</span> <span word="birdsong">birdsong</span>. <span word="In">In</span> <span word="the">the</span> <span word="first">first</span>, <span word="male">male</span> <span word="competition">competition</span> <span word="and">and</span> <span word="intrasexual">intrasexual</span> <span word="selection">selection</span> <span word="produce">produce</span> <span word="relatively">relatively</span> <span word="short">short</span>, <span word="simple">simple</span> <span word="songs">songs</span> <span word="used">used</span> <span word="mainly">mainly</span> <span word="in">in</span> <span word="territorial">territorial</span> <span word="behavior">behavior</span>. <span word="In">In</span> <span word="the">the</span> <span word="second">second</span>, <span word="female">female</span> <span word="choice">choice</span> <span word="and">and</span> <span word="intersexual">intersexual</span> <span word="selection">selection</span> <span word="produce">produce</span> <span word="longer">longer</span>, <span word="more">more</span> <span word="complicated">complicated</span> <span word="songs">songs</span> <span word="used">used</span> <span word="mainly">mainly</span> <span word="in">in</span> <span word="mate">mate</span> <span word="attraction">attraction</span>; <span word="like">like</span> <span word="such">such</span> <span word="visual">visual</span> <span word="ornamentation">ornamentation</span> <span word="as">as</span> <span word="the">the</span> <span word="peacocks">peacocks</span> <span word="tail">tail</span>, <span word="elaborate">elaborate</span> <span word="vocal">vocal</span> <span word="characteristics">characteristics</span> <span word="increase">increase</span> <span word="the">the</span> <span word="males">males</span> <span word="chances">chances</span> <span word="of">of</span> <span word="being">being</span> <span word="chosen">chosen</span> <span word="as">as</span> <span word="a">a</span> <span word="mate">mate</span>, <span word="and">and</span> <span word="he">he</span> <span word="thus">thus</span> <span word="enjoys">enjoys</span> <span word="more">more</span> <span word="reproductive">reproductive</span> <span word="success">success</span> <span word="than">than</span> <span word="his">his</span> <span word="less">less</span> <span word="ostentatious">ostentatious</span> <span word="rivals">rivals</span>. <span word="The">The</span> <span word="two">two</span> <span word="pathways">pathways</span> <span word="are">are</span> <span word="not">not</span> <span word="mutually">mutually</span> <span word="exclusive">exclusive</span>, <span word="and">and</span> <span word="we">we</span> <span word="can">can</span> <span word="expect">expect</span> <span word="to">to</span> <span word="find">find</span> <span word="examples">examples</span> <span word="that">that</span> <span word="reflect">reflect</span> <span word="their">their</span> <span word="interaction">interaction</span>. <span word="Teasing">Teasing</span> <span word="them">them</span> <span word="apart">apart</span> <span word="has">has</span> <span word="been">been</span> <span word="an">an</span> <span word="important">important</span> <span word="challenge">challenge</span> <span word="to">to</span> <span word="evolutionary">evolutionary</span> <span word="biologists">biologists</span>.</p><p> <span word="Early">Early</span> <span word="research">research</span> <span word="confirmed">confirmed</span> <span word="the">the</span> <span word="role">role</span> <span word="of">of</span> <span word="intrasexual">intrasexual</span> <span word="selection">selection</span>. <span word="In">In</span> <span word="a">a</span> <span word="variety">variety</span> <span word="of">of</span> <span word="experiments">experiments</span> <span word="in">in</span> <span word="the">the</span> <span word="field">field</span>, <span word="males">males</span> <span word="responded">responded</span> <span word="aggressively">aggressively</span> <span word="to">to</span> <span word="recorded">recorded</span> <span word="songs">songs</span> <span word="by">by</span> <span word="exhibiting">exhibiting</span> <span word="territorial">territorial</span> <span word="behavior">behavior</span> <span word="near">near</span> <span word="the">the</span> <span word="speakers">speakers</span>. <span word="The">The</span> <span word="breakthrough">breakthrough</span> <span word="for">for</span> <span word="research">research</span> <span word="into">into</span> <span word="intersexual">intersexual</span> <span word="selection">selection</span> <span word="came">came</span> <span word="in">in</span> <span word="the">the</span> <span word="development">development</span> <span word="of">of</span> <span word="a">a</span> <span word="new">new</span> <span word="technique">technique</span> <span word="for">for</span> <span word="investigating">investigating</span> <span word="female">female</span> <span word="response">response</span> <span word="in">in</span> <span word="the">the</span> <span word="laboratory">laboratory</span>. <span word="When">When</span> <span word="female">female</span> <span word="cowbirds">cowbirds</span> <span word="raised">raised</span> <span word="in">in</span> <span word="isolation">isolation</span> <span word="in">in</span> <span word="sound">sound</span>-<span word="proof">proof</span> <span word="chambers">chambers</span> <span word="were">were</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="recordings">recordings</span> <span word="of">of</span> <span word="male">male</span> <span word="song">song</span>, <span word="they">they</span> <span word="responded">responded</span> <span word="by">by</span> <span word="exhibiting">exhibiting</span> <span word="mating">mating</span> <span word="behavior">behavior</span>. <span word="By">By</span> <span word="quantifying">quantifying</span> <span word="the">the</span> <span word="responses">responses</span>, <span word="researchers">researchers</span> <span word="were">were</span> <span word="able">able</span> <span word="to">to</span> <span word="determine">determine</span> <span word="what">what</span> <span word="particular">particular</span> <span word="features">features</span> <span word="of">of</span> <span word="the">the</span> <span word="song">song</span> <span word="were">were</span> <span word="most">most</span> <span word="important">important</span>. <span word="In">In</span> <span word="further">further</span> <span word="experiments">experiments</span> <span word="on">on</span> <span word="song">song</span> <span word="sparrows">sparrows</span>, <span word="researchers">researchers</span> <span word="found">found</span> <span word="that">that</span> <span word="when">when</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="a">a</span> <span word="single">single</span> <span word="song">song</span> <span word="type">type</span> <span word="repeated">repeated</span> <span word="several">several</span> <span word="times">times</span> <span word="or">or</span> <span word="to">to</span> <span word="a">a</span> <span word="repertoire">repertoire</span> <span word="of">of</span> <span word="different">different</span> <span word="song">song</span> <span word="types">types</span>, <span word="females">females</span> <span word="responded">responded</span> <span word="more">more</span> <span word="to">to</span> <span word="the">the</span> <span word="latter">latter</span>. <span word="The">The</span> <span word="beauty">beauty</span> <span word="of">of</span> <span word="the">the</span> <span word="experimental">experimental</span> <span word="design">design</span> <span word="is">is</span> <span word="that">that</span> <span word="it">it</span> <span word="effectively">effectively</span> <span word="rules">rules</span> <span word="out">out</span> <span word="confounding">confounding</span> <span word="variables">variables</span>; <span word="acoustic">acoustic</span> <span word="isolation">isolation</span> <span word="assures">assures</span> <span word="that">that</span> <span word="the">the</span> <span word="female">female</span> <span word="can">can</span> <span word="respond">respond</span> <span word="only">only</span> <span word="to">to</span> <span word="the">the</span> <span word="song">song</span> <span word="structure">structure</span> <span word="itself">itself</span>.</p>
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