2015年职称英语理工类AB级阅读理解精选练习(四)
<p> <span word="Why">Why</span> <span word="Humans">Humans</span> <span word="Walk">Walk</span> <span word="On">On</span> <span word="Two">Two</span> <span word="Legs">Legs</span></p><p> <span word="A">A</span> <span word="team">team</span> <span word="of">of</span> <span word="scientists">scientists</span> <span word="that">that</span> <span word="studied">studied</span> <span word="chimpanzees">chimpanzees</span> <span word="trained">trained</span> <span word="to">to</span> <span word="use">use</span> <span word="treadmills">treadmills</span> <span word="has">has</span> <span word="gathered">gathered</span> <span word="new">new</span> <span word="evidence">evidence</span> <span word="suggesting">suggesting</span> <span word="that">that</span> <span word="our">our</span> <span word="earliest">earliest</span> <span word="apelike">apelike</span> <span word="ancestors">ancestors</span> <span word="started">started</span> <span word="walking">walking</span> <span word="on">on</span> <span word="two">two</span> <span word="legs">legs</span> <span word="because">because</span> <span word="it">it</span> <span word="required">required</span> <span word="less">less</span> <span word="energy">energy</span> <span word="than">than</span> <span word="getting">getting</span> <span word="around">around</span> <span word="on">on</span> <span word="all">all</span> <span word="fours">fours</span>.</p><p> <span word="The">The</span> <span word="five">five</span> <span word="chimps">chimps</span> <span word="also">also</span> <span word="wore">wore</span> <span word="face">face</span> <span word="masks">masks</span> <span word="used">used</span> <span word="to">to</span> <span word="help">help</span> <span word="the">the</span> <span word="researchers">researchers</span> <span word="measure">measure</span> <span word="oxygen">oxygen</span> <span word="consumption">consumption</span>. <span word="While">While</span> <span word="the">the</span> <span word="chimps">chimps</span> <span word="worked">worked</span> <span word="out">out</span>, <span word="the">the</span> <span word="scientists">scientists</span> <span word="collected">collected</span> <span word="metabolic">metabolic</span> <span word="and">and</span> <span word="other">other</span> <span word="data">data</span> <span word="that">that</span> <span word="allowed">allowed</span> <span word="them">them</span> <span word="to">to</span> <span word="calculate">calculate</span> <span word="which">which</span> <span word="method">method</span> <span word="of">of</span> <span word="locomotion">locomotion</span> <span word="used">used</span> <span word="less">less</span> <span word="energy">energy</span> <span word="and">and</span> <span word="why">why</span>. <span word="The">The</span> <span word="team">team</span> <span word="gathered">gathered</span> <span word="the">the</span> <span word="same">same</span> <span word="information">information</span> <span word="for">for</span> <span word="four">four</span> <span word="adult">adult</span> <span word="humans">humans</span> <span word="walking">walking</span> <span word="on">on</span> <span word="a">a</span> <span word="treadmill">treadmill</span>.</p><p> <span word="We">We</span> <span word="were">were</span> <span word="prepared">prepared</span> <span word="to">to</span> <span word="find">find</span> <span word="that">that</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="chimps">chimps</span> <span word="used">used</span> <span word="more">more</span> <span word="energy">energy</span> <span word="walking">walking</span> <span word="on">on</span> <span word="two">two</span> <span word="legs">legs</span><span word="but">but</span> <span word="that">that</span> <span word="finding">finding</span> <span word="wouldnt">wouldnt</span> <span word="have">have</span> <span word="been">been</span> <span word="as">as</span> <span word="interesting">interesting</span>, <span word="Sockol">Sockol</span> <span word="said">said</span>. <span word="What">What</span> <span word="we">we</span> <span word="found">found</span> <span word="was">was</span> <span word="much">much</span> <span word="more">more</span> <span word="telling">telling</span>. <span word="For">For</span> <span word="three">three</span> <span word="chimps">chimps</span>, <span word="bipedalism">bipedalism</span>3 <span word="was">was</span> <span word="more">more</span> <span word="expensive">expensive</span>, <span word="but">but</span> <span word="for">for</span> <span word="the">the</span> <span word="other">other</span> <span word="two">two</span> <span word="chimps">chimps</span>, <span word="this">this</span> <span word="wasnt">wasnt</span> <span word="the">the</span> <span word="case">case</span>. <span word="One">One</span> <span word="spent">spent</span> <span word="about">about</span> <span word="the">the</span> <span word="same">same</span> <span word="energy">energy</span> <span word="walking">walking</span> <span word="on">on</span> <span word="two">two</span> <span word="legs">legs</span> <span word="as">as</span> <span word="on">on</span> <span word="four">four</span>. <span word="The">The</span> <span word="other">other</span> <span word="used">used</span> <span word="less">less</span> <span word="energy">energy</span> <span word="walking">walking</span> <span word="upright">upright</span>. <span word="These">These</span> <span word="two">two</span> <span word="chimps">chimps</span> <span word="had">had</span> <span word="different">different</span> <span word="gaits">gaits</span> <span word="and">and</span> <span word="anatomy">anatomy</span> <span word="than">than</span> <span word="their">their</span> <span word="knucklewalking">knucklewalking</span> <span word="peers">peers</span>.</p><p> <span word="Fossil">Fossil</span> <span word="and">and</span> <span word="molecular">molecular</span> <span word="evidence">evidence</span> <span word="suggests">suggests</span> <span word="the">the</span> <span word="earliest">earliest</span> <span word="ancestors">ancestors</span> <span word="of">of</span> <span word="the">the</span> <span word="human">human</span> <span word="family">family</span> <span word="lived">lived</span> <span word="in">in</span> <span word="forested">forested</span> <span word="areas">areas</span> <span word="in">in</span> <span word="equatorial">equatorial</span> <span word="Africa">Africa</span> <span word="in">in</span> <span word="the">the</span> <span word="late">late</span> <span word="Miocene">Miocene</span> <span word="era">era</span> <span word="some">some</span> 8 <span word="to">to</span> 10 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>, <span word="when">when</span> <span word="changes">changes</span> <span word="in">in</span> <span word="climate">climate</span> <span word="may">may</span> <span word="have">have</span> <span word="increased">increased</span> <span word="in">in</span> <span word="distance">distance</span> <span word="between">between</span> <span word="food">food</span> <span word="patches">patches</span>. <span word="That">That</span> <span word="would">would</span> <span word="have">have</span> <span word="forced">forced</span> <span word="our">our</span> <span word="earliest">earliest</span> <span word="ancestors">ancestors</span> <span word="to">to</span> <span word="travel">travel</span> <span word="longer">longer</span> <span word="distances">distances</span> <span word="on">on</span> <span word="the">the</span> <span word="ground">ground</span> <span word="and">and</span> <span word="favored">favored</span> <span word="those">those</span> <span word="who">who</span> <span word="could">could</span> <span word="cover">cover</span> <span word="more">more</span> <span word="ground">ground</span> <span word="using">using</span> <span word="less">less</span> <span word="energy">energy</span>.</p>
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