六级冲刺练习：阅读（94）
<p> <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="found">found</span> <span word="that">that</span> <span word="there">there</span> <span word="are">are</span> <span word="three">three</span> 13 <span word="stages">stages</span> <span word="in">in</span> <span word="a">a</span> <span word="mosquitos">mosquitos</span> <span word="assault">assault</span>. <span word="Stage">Stage</span> <span word="one">one</span> <span word="is">is</span> <span word="at">at</span> <span word="fifty">fifty</span> <span word="feet">feet</span> <span word="away">away</span>, <span word="when">when</span> <span word="the">the</span> <span word="insect">insect</span> <span word="first">first</span> <span word="smells">smells</span> <span word="a">a</span> <span word="man">man</span> <span word="or">or</span> <span word="a">a</span> <span word="animal">animal</span> <span word="to">to</span> 14 . <span word="Stage">Stage</span> <span word="two">two</span> <span word="is">is</span> <span word="thought">thought</span> <span word="to">to</span> <span word="come">come</span> <span word="into">into</span> <span word="operation">operation</span> <span word="about">about</span> <span word="twenty">twenty</span>-<span word="five">five</span> <span word="feet">feet</span> <span word="from">from</span> <span word="the">the</span> <span word="target">target</span>, <span word="when">when</span> <span word="the">the</span> <span word="insect">insect</span> <span word="becomes">becomes</span> <span word="guided">guided</span> <span word="by">by</span> <span word="the">the</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="breathed">breathed</span> <span word="out">out</span> <span word="by">by</span> <span word="the">the</span> <span word="intended">intended</span> <span word="victim">victim</span>. <span word="Stage">Stage</span> <span word="three">three</span> <span word="is">is</span> <span word="when">when</span> <span word="the">the</span> <span word="mosquito">mosquito</span> <span word="is">is</span> <span word="only">only</span> <span word="a">a</span> <span word="matter">matter</span> <span word="of">of</span> <span word="inches">inches</span> <span word="from">from</span> <span word="its">its</span> 15 <span word="the">the</span> <span word="warmth">warmth</span> <span word="and">and</span> <span word="moisture">moisture</span> <span word="given">given</span> <span word="off">off</span> <span word="by">by</span> <span word="the">the</span> <span word="victim">victim</span> <span word="is">is</span> <span word="the">the</span> <span word="final">final</span> <span word="clue">clue</span>.</p><p> <span word="The">The</span> <span word="researchers">researchers</span> <span word="then">then</span> 16 <span word="how">how</span> <span word="repellents">repellents</span> <span word="interfere">interfere</span> <span word="with">with</span> <span word="its">its</span> <span word="three">three</span>-<span word="stage">stage</span> <span word="attack">attack</span>. <span word="They">They</span> <span word="found">found</span> <span word="repellents">repellents</span> <span word="act">act</span> <span word="more">more</span> <span word="subtly">subtly</span> <span word="than">than</span> <span word="by">by</span> <span word="just">just</span> <span word="giving">giving</span> <span word="off">off</span> <span word="a">a</span> <span word="nasty">nasty</span> <span word="smell">smell</span>. <span word="A">A</span> <span word="Canadian">Canadian</span> <span word="researcher">researcher</span> <span word="says">says</span> <span word="that">that</span> <span word="repellents">repellents</span> <span word="appear">appear</span> <span word="to">to</span> 17 <span word="mosquitoes">mosquitoes</span> <span word="first">first</span> <span word="when">when</span> <span word="it">it</span> <span word="is">is</span> <span word="following">following</span> <span word="the">the</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="and">and</span> <span word="second">second</span> <span word="during">during</span> <span word="the">the</span> <span word="final">final</span> <span word="approach">approach</span>, <span word="where">where</span> <span word="the">the</span> <span word="warmth">warmth</span> <span word="and">and</span> <span word="moisture">moisture</span> <span word="are">are</span> <span word="the">the</span> <span word="insects">insects</span> 18 .</p><p> <span word="Air">Air</span> <span word="pervaded">pervaded</span> <span word="by">by</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="many">many</span> <span word="chemical">chemical</span> <span word="repellents">repellents</span> <span word="stops">stops</span> <span word="the">the</span> <span word="mosquito">mosquito</span> <span word="reacting">reacting</span> <span word="to">to</span> <span word="the">the</span> <span word="victims">victims</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span>, <span word="and">and</span> <span word="the">the</span> <span word="repellent">repellent</span> <span word="seems">seems</span> <span word="to">to</span> <span word="affect">affect</span> <span word="the">the</span> <span word="tiny">tiny</span> <span word="hairs">hairs</span> <span word="with">with</span> <span word="which">which</span> <span word="the">the</span> <span word="insect">insect</span> <span word="senses">senses</span> <span word="moisture">moisture</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span>. <span word="The">The</span> <span word="sensors">sensors</span> <span word="are">are</span> <span word="blocked">blocked</span> <span word="so">so</span> <span word="that">that</span> <span word="the">the</span> 19 <span word="does">does</span> <span word="not">not</span> <span word="know">know</span> <span word="whether">whether</span> <span word="it">it</span> <span word="is">is</span> <span word="flying">flying</span> <span word="through">through</span> <span word="a">a</span> <span word="moist">moist</span> <span word="current">current</span>, <span word="or">or</span></p><p> <span word="the">the</span> <span word="sensors">sensors</span> <span word="are">are</span> <span word="made">made</span> <span word="to">to</span> <span word="send">send</span> <span word="the">the</span> 20 <span word="signals">signals</span>.</p><p> <span word="A">A</span>. <span word="examined">examined</span> <span word="B">B</span>. <span word="animal">animal</span> <span word="C">C</span>. <span word="wrong">wrong</span> <span word="D">D</span>. <span word="insect">insect</span></p><p> <span word="E">E</span>. <span word="bite">bite</span> <span word="F">F</span>. <span word="Unfortunately">Unfortunately</span> <span word="G">G</span>. <span word="inventing">inventing</span> <span word="H">H</span>. <span word="distinct">distinct</span></p><p> <span word="I">I</span>. <span word="prey">prey</span> <span word="J">J</span>. <span word="guide">guide</span> <span word="K">K</span>. <span word="checked">checked</span> <span word="L">L</span>. <span word="definite">definite</span></p><p> <span word="M">M</span>. <span word="Unnecessarily">Unnecessarily</span> <span word="N">N</span>. <span word="confuse">confuse</span> <span word="O">O</span>. <span word="discovering">discovering</span></p>
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