2014年职称英语理工类阅读理解练习(14)
<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="When">When</span> <span word="our">our</span> <span word="earliest">earliest</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="they">they</span> <span word="took">took</span> <span word="the">the</span> <span word="first">first</span> <span word="steps">steps</span> <span word="toward">toward</span> <span word="becoming">becoming</span> <span word="human">human</span>, <span word="said">said</span> <span word="lead">lead</span> <span word="researcher">researcher</span> <span word="Michael">Michael</span> <span word="Sockol">Sockol</span> <span word="of">of</span> <span word="UC">UC</span> <span word="Davis">Davis</span>1.<span word="Our">Our</span> <span word="findings">findings</span> <span word="help">help</span> <span word="an">an</span>,<span word="swer">swer</span> <span word="why">why</span>. <span word="Sockol">Sockol</span> <span word="worked">worked</span> <span word="for">for</span> <span word="two">two</span> <span word="years">years</span> <span word="to">to</span> <span word="find">find</span> <span word="an">an</span> <span word="animal">animal</span> <span word="trainer">trainer</span> <span word="willing">willing</span> <span word="to">to</span> <span word="coax">coax</span> <span word="adult">adult</span> <span word="chimps">chimps</span> <span word="to">to</span> <span word="walk">walk</span> <span word="on">on</span> <span word="two">two</span> <span word="legs">legs</span> <span word="and">and</span> <span word="to">to</span> <span word="knucklewalk">knucklewalk</span> <span word="on">on</span> <span word="all">all</span> <span word="fours">fours</span> <span word="on">on</span> <span word="the">the</span> <span word="sort">sort</span> <span word="of">of</span> <span word="treadmill">treadmill</span> <span word="found">found</span> <span word="in">in</span> <span word="most">most</span> <span word="gyms">gyms</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="Tile">Tile</span> <span word="researchers">researchers</span> <span word="found">found</span> <span word="that">that</span> <span word="human">human</span> <span word="walking">walking</span> <span word="used">used</span> <span word="about">about</span> 75 <span word="percent">percent</span> <span word="less">less</span> <span word="energy">energy</span> <span word="and">and</span> <span word="burned">burned</span> 75 <span word="percent">percent</span> <span word="fewer">fewer</span> <span word="calories">calories</span> <span word="than">than</span> <span word="quadrupedal">quadrupedal</span> <span word="and">and</span> <span word="bipedal">bipedal</span>2 <span word="walking">walking</span> <span word="in">in</span> <span word="chimpanzees">chimpanzees</span>. <span word="They">They</span> <span word="also">also</span> <span word="found">found</span> <span word="that">that</span> <span word="for">for</span> <span word="some">some</span> <span word="but">but</span> <span word="not">not</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="chimps">chimps</span>，<span word="walking">walking</span> <span word="on">on</span> <span word="two">two</span> <span word="legs">legs</span> <span word="was">was</span> <span word="no">no</span> <span word="more">more</span> <span word="costly">costly</span> <span word="than">than</span> <span word="knucklewalking">knucklewalking</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>
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