专业英语四级考试阅读理解练习题及答案详解(九)
<p> <span word="Human">Human</span> <span word="beings">beings</span> <span word="have">have</span> <span word="used">used</span> <span word="tools">tools</span> <span word="for">for</span> <span word="a">a</span> <span word="very">very</span> <span word="long">long</span> <span word="time">time</span>. <span word="In">In</span> <span word="some">some</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span> <span word="you">you</span> <span word="can">can</span> <span word="still">still</span> <span word="find">find</span> <span word="tools">tools</span> <span word="that">that</span> <span word="people">people</span> <span word="used">used</span> <span word="more">more</span> <span word="than">than</span> <span word="two">two</span> <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>.</p><p> <span word="They">They</span> <span word="made">made</span> <span word="these">these</span> <span word="tools">tools</span> <span word="by">by</span> <span word="hitting">hitting</span> <span word="one">one</span> <span word="stone">stone</span> <span word="against">against</span> <span word="another">another</span>. <span word="In">In</span> <span word="this">this</span> <span word="way">way</span>, <span word="they">they</span> <span word="broke">broke</span> <span word="off">off</span> <span word="pieces">pieces</span> <span word="from">from</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="stones">stones</span>. <span word="These">These</span> <span word="chips">chips</span> <span word="of">of</span> <span word="stone">stone</span> <span word="were">were</span> <span word="usually">usually</span> <span word="sharp">sharp</span> <span word="on">on</span> <span word="one">one</span> <span word="side">side</span>. <span word="People">People</span> <span word="used">used</span> <span word="them">them</span> <span word="for">for</span> <span word="cutting">cutting</span> <span word="meat">meat</span> <span word="and">and</span> <span word="skin">skin</span> <span word="from">from</span> <span word="dead">dead</span> <span word="animals">animals</span>, <span word="and">and</span> <span word="also">also</span> <span word="for">for</span> <span word="making">making</span> <span word="other">other</span> <span word="tools">tools</span> <span word="out">out</span> <span word="of">of</span> <span word="wood">wood</span>. <span word="Human">Human</span> <span word="beings">beings</span> <span word="needed">needed</span> <span word="to">to</span> <span word="use">use</span> <span word="tools">tools</span> <span word="because">because</span> <span word="they">they</span> <span word="did">did</span> <span word="not">not</span> <span word="have">have</span> <span word="sharp">sharp</span> <span word="teeth">teeth</span> <span word="like">like</span> <span word="other">other</span> <span word="meat">meat</span> <span word="eating">eating</span> <span word="animals">animals</span>, <span word="such">such</span> <span word="as">as</span> <span word="lions">lions</span> <span word="and">and</span> <span word="tigers">tigers</span>. <span word="Tools">Tools</span> <span word="helped">helped</span> <span word="people">people</span> <span word="to">to</span> <span word="get">get</span> <span word="food">food</span> <span word="more">more</span> <span word="easily">easily</span>.</p><p> <span word="Working">Working</span> <span word="with">with</span> <span word="tools">tools</span> <span word="also">also</span> <span word="helped">helped</span> <span word="to">to</span> <span word="develop">develop</span> <span word="human">human</span> <span word="intelligence">intelligence</span>. <span word="The">The</span> <span word="human">human</span> <span word="brain">brain</span> <span word="grew">grew</span> <span word="bigger">bigger</span>, <span word="and">and</span> <span word="human">human</span> <span word="beings">beings</span> <span word="began">began</span> <span word="to">to</span> <span word="invent">invent</span> <span word="more">more</span> <span word="and">and</span> <span word="more">more</span> <span word="tools">tools</span> <span word="and">and</span> <span word="machines">machines</span>.<span word="The">The</span> <span word="stone">stone</span> <span word="chip">chip</span> <span word="was">was</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="first">first</span> <span word="tools">tools</span> <span word="that">that</span> <span word="people">people</span> <span word="used">used</span>, <span word="and">and</span> <span word="perhaps">perhaps</span> <span word="it">it</span> <span word="is">is</span> <span word="the">the</span> <span word="most">most</span> <span word="important">important</span>. <span word="Some">Some</span> <span word="scientists">scientists</span> <span word="say">say</span> <span word="that">that</span> <span word="it">it</span> <span word="was">was</span> <span word="the">the</span> <span word="key">key</span> <span word="to">to</span> <span word="success">success</span> <span word="of">of</span> <span word="mankind">mankind</span>. <span word="Since">Since</span> 1960 <span word="a">a</span> <span word="new">new</span> <span word="kind">kind</span> <span word="of">of</span> <span word="tool">tool</span> <span word="has">has</span> <span word="appeared">appeared</span>. <span word="This">This</span> <span word="is">is</span> <span word="the">the</span> <span word="silicon">silicon</span> <span word="chipa">chipa</span> <span word="little">little</span> <span word="chip">chip</span> <span word="of">of</span> <span word="silicon">silicon</span> <span word="crystal">crystal</span>. <span word="It">It</span> <span word="is">is</span> <span word="smaller">smaller</span> <span word="than">than</span> <span word="a">a</span> <span word="fingernail">fingernail</span>, <span word="but">but</span> <span word="it">it</span> <span word="can">can</span> <span word="store">store</span> <span word="more">more</span> <span word="than">than</span> <span word="a">a</span> <span word="millionbits">millionbits</span> <span word="of">of</span> <span word="information">information</span>. <span word="It">It</span> <span word="is">is</span> <span word="an">an</span> <span word="electronic">electronic</span> <span word="brain">brain</span>. <span word="Every">Every</span> <span word="year">year</span> <span word="these">these</span> <span word="chips">chips</span> <span word="get">get</span> <span word="cleverer">cleverer</span>, <span word="but">but</span> <span word="their">their</span> <span word="size">size</span> <span word="gets">gets</span> <span word="smaller">smaller</span>, <span word="and">and</span> <span word="their">their</span> <span word="cost">cost</span> <span word="gets">gets</span> <span word="less">less</span>.</p><p> <span word="They">They</span> <span word="are">are</span> <span word="used">used</span> <span word="in">in</span> <span word="watches">watches</span>, <span word="calculators">calculators</span> <span word="and">and</span> <span word="intelligent">intelligent</span> <span word="machines">machines</span> <span word="that">that</span> <span word="we">we</span> <span word="can">can</span> <span word="use">use</span> <span word="in">in</span> <span word="many">many</span> <span word="ways">ways</span>. <span word="In">In</span> <span word="the">the</span> <span word="future">future</span> <span word="we">we</span> <span word="will">will</span> <span word="not">not</span> <span word="need">need</span> <span word="to">to</span> <span word="work">work</span> <span word="with">with</span> <span word="tools">tools</span> <span word="in">in</span> <span word="the">the</span> <span word="old">old</span> <span word="way">way</span>. <span word="Machines">Machines</span> <span word="will">will</span> <span word="do">do</span> <span word="everything">everything</span> <span word="for">for</span> <span word="us">us</span>. <span word="They">They</span> <span word="will">will</span> <span word="even">even</span> <span word="talk">talk</span> <span word="and">and</span> <span word="play">play</span> <span word="games">games</span> <span word="with">with</span> <span word="us">us</span>. <span word="People">People</span> <span word="will">will</span> <span word="have">have</span> <span word="plenty">plenty</span> <span word="of">of</span> <span word="spare">spare</span> <span word="time">time</span>. <span word="But">But</span> <span word="what">what</span> <span word="will">will</span> <span word="they">they</span> <span word="do">do</span> <span word="with">with</span> <span word="it">it</span>? <span word="Human">Human</span> <span word="beings">beings</span> <span word="used">used</span> <span word="stone">stone</span> <span word="chips">chips</span> <span word="for">for</span> <span word="more">more</span> <span word="than">than</span> <span word="two">two</span> <span word="million">million</span> <span word="years">years</span>, <span word="but">but</span> <span word="human">human</span> <span word="life">life</span> <span word="changed">changed</span> <span word="very">very</span> <span word="little">little</span> <span word="in">in</span> <span word="that">that</span> <span word="time">time</span>. <span word="We">We</span> <span word="have">have</span> <span word="used">used</span> <span word="silicon">silicon</span> <span word="chips">chips</span> <span word="for">for</span> <span word="only">only</span> <span word="a">a</span> <span word="few">few</span> <span word="years">years</span>, <span word="but">but</span> <span word="life">life</span> <span word="is">is</span> <span word="changing">changing</span> <span word="faster">faster</span> <span word="every">every</span> <span word="day">day</span>. <span word="What">What</span> <span word="will">will</span> <span word="life">life</span> <span word="be">be</span> <span word="like">like</span> <span word="twenty">twenty</span> <span word="years">years</span> <span word="from">from</span> <span word="now">now</span>? <span word="What">What</span> <span word="will">will</span> <span word="the">the</span> <span word="world">world</span> <span word="be">be</span> <span word="like">like</span> <span word="two">two</span> <span word="million">million</span> <span word="years">years</span> <span word="from">from</span> <span word="now">now</span>?</p>
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