大学英语四六级考试阅读提高的练习（17）
<p> <span word="The">The</span> <span word="first">first</span> <span word="cook">cook</span>. <span word="It">It</span> <span word="took">took</span> <span word="a">a</span> <span word="long">long</span> <span word="time">time</span>, <span word="however">however</span>, <span word="to">to</span> <span word="learn">learn</span> <span word="how">how</span> <span word="to">to</span> <span word="use">use</span> <span word="this">this</span> <span word="gift">gift</span>. <span word="For">For</span> <span word="centuries">centuries</span> <span word="men">men</span> <span word="lived">lived</span> <span word="like">like</span> <span word="wild">wild</span> <span word="animals">animals</span>. <span word="Their">Their</span> <span word="food">food</span> <span word="consisted">consisted</span> <span word="of">of</span> <span word="nuts">nuts</span>, <span word="herbs">herbs</span>, <span word="fruit">fruit</span>, <span word="and">and</span> <span word="the">the</span> <span word="flesh">flesh</span> <span word="of">of</span> <span word="animals">animals</span>. <span word="Cooking">Cooking</span> <span word="was">was</span> <span word="unknown">unknown</span>, <span word="and">and</span> <span word="when">when</span> <span word="a">a</span> <span word="wild">wild</span> <span word="animal">animal</span> <span word="was">was</span> <span word="captured">captured</span>, <span word="the">the</span> <span word="savage">savage</span> <span word="tore">tore</span> <span word="it">it</span> <span word="apart">apart</span> <span word="and">and</span> <span word="ate">ate</span> <span word="the">the</span> <span word="raw">raw</span> <span word="flesh">flesh</span>. <span word="According">According</span> <span word="to">to</span> <span word="one">one</span> <span word="legend">legend</span>, <span word="a">a</span> <span word="hunter">hunter</span>, <span word="after">after</span> <span word="a">a</span> <span word="long">long</span> <span word="tramp">tramp</span>, <span word="succeeded">succeeded</span> <span word="in">in</span> <span word="catching">catching</span> <span word="a">a</span> <span word="rabbit">rabbit</span>. <span word="On">On</span> <span word="his">his</span> <span word="way">way</span> <span word="home">home</span> <span word="he">he</span> <span word="found">found</span> <span word="a">a</span> <span word="smoldering">smoldering</span> <span word="fire">fire</span> <span word="which">which</span> <span word="had">had</span> <span word="been">been</span> <span word="started">started</span> <span word="by">by</span> <span word="lightning">lightning</span>. <span word="Throwing">Throwing</span> <span word="his">his</span> <span word="rabbit">rabbit</span> <span word="on">on</span> <span word="a">a</span> <span word="log">log</span>, <span word="he">he</span> <span word="lay">lay</span> <span word="down">down</span> <span word="and">and</span> <span word="went">went</span> <span word="to">to</span> <span word="sleep">sleep</span>. <span word="When">When</span> <span word="he">he</span> <span word="awoke">awoke</span>, <span word="he">he</span> <span word="found">found</span> <span word="that">that</span> <span word="his">his</span> <span word="rabbit">rabbit</span> <span word="had">had</span> <span word="fallen">fallen</span> <span word="into">into</span> <span word="the">the</span> <span word="fire">fire</span>. <span word="In">In</span> <span word="attempting">attempting</span> <span word="to">to</span> <span word="rescue">rescue</span> <span word="it">it</span>, <span word="the">the</span> <span word="savage">savage</span> <span word="got">got</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="juice">juice</span> <span word="of">of</span> <span word="the">the</span> <span word="roasted">roasted</span> <span word="rabbit">rabbit</span> <span word="on">on</span> <span word="his">his</span> <span word="fingers">fingers</span>. <span word="By">By</span> <span word="instinct">instinct</span>, <span word="he">he</span> <span word="put">put</span> <span word="his">his</span> <span word="burnt">burnt</span> <span word="fingers">fingers</span> <span word="to">to</span> <span word="his">his</span> <span word="mouth">mouth</span>, <span word="and">and</span> <span word="the">the</span> <span word="taste">taste</span> <span word="was">was</span> <span word="so">so</span> <span word="pleasing">pleasing</span> <span word="that">that</span> <span word="he">he</span> <span word="immediately">immediately</span> <span word="finished">finished</span> <span word="the">the</span> <span word="rabbit">rabbit</span>, <span word="and">and</span> <span word="this">this</span> <span word="is">is</span> <span word="how">how</span> <span word="man">man</span> <span word="learned">learned</span> <span word="to">to</span> <span word="cook">cook</span>.</p><p> <span word="Reduction">Reduction</span> <span word="of">of</span> <span word="metals">metals</span>. <span word="Ages">Ages</span> <span word="later">later</span>, <span word="man">man</span> <span word="began">began</span> <span word="to">to</span> <span word="use">use</span> <span word="fire">fire</span> <span word="to">to</span> <span word="make">make</span> <span word="metals">metals</span> <span word="and">and</span> <span word="to">to</span> <span word="form">form</span> <span word="them">them</span> <span word="into">into</span> <span word="spears">spears</span> <span word="and">and</span> <span word="hatchets">hatchets</span> <span word="for">for</span> <span word="hunting">hunting</span> <span word="and">and</span> <span word="fighting">fighting</span>. <span word="The">The</span> <span word="alchemists">alchemists</span>, <span word="as">as</span> <span word="we">we</span> <span word="know">know</span>, <span word="used">used</span> <span word="fire">fire</span> <span word="in">in</span> <span word="their">their</span> <span word="attempts">attempts</span> <span word="to">to</span> <span word="change">change</span> <span word="the">the</span> <span word="base">base</span> <span word="metals">metals</span> <span word="into">into</span> <span word="gold">gold</span>, <span word="and">and</span> <span word="today">today</span> <span word="fires">fires</span> <span word="are">are</span> <span word="burning">burning</span> <span word="in">in</span> <span word="many">many</span> <span word="furnaces">furnaces</span> <span word="producing">producing</span>, <span word="if">if</span> <span word="not">not</span> <span word="gold">gold</span>, <span word="metals">metals</span> <span word="of">of</span> <span word="far">far</span> <span word="greater">greater</span> <span word="value">value</span> <span word="to">to</span> <span word="the">the</span> <span word="progress">progress</span> <span word="of">of</span> <span word="civilization">civilization</span>. <span word="Copper">Copper</span>, <span word="bronze">bronze</span>, <span word="iron">iron</span>, <span word="and">and</span> <span word="steel">steel</span>, <span word="produced">produced</span> <span word="by">by</span> <span word="fire">fire</span>, <span word="have">have</span> <span word="been">been</span> <span word="the">the</span> <span word="stepping">stepping</span> <span word="stones">stones</span> <span word="of">of</span> <span word="mans">mans</span> <span word="progress">progress</span> <span word="through">through</span> <span word="the">the</span> <span word="ages">ages</span>. <span word="The">The</span> <span word="chemistry">chemistry</span> <span word="involved">involved</span> <span word="in">in</span> <span word="the">the</span> <span word="extraction">extraction</span>, <span word="purification">purification</span>, <span word="and">and</span> <span word="alloying">alloying</span> <span word="of">of</span> <span word="metals">metals</span> <span word="is">is</span> <span word="so">so</span> <span word="interesting">interesting</span> <span word="and">and</span> <span word="of">of</span> <span word="such">such</span> <span word="great">great</span> <span word="importance">importance</span> <span word="that">that</span> <span word="volumes">volumes</span> <span word="have">have</span> <span word="been">been</span> <span word="written">written</span> <span word="on">on</span> <span word="this">this</span> <span word="subject">subject</span>.</p>
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