2017高考英语三轮冲刺阅读强化训练37
<p> 、阅读理解（本大题共5小题，共0分）</p><p> <span word="A">A</span></p><p> <span word="Studying">Studying</span> <span word="carbon">carbon</span> <span word="atoms">atoms</span> (碳原子) <span word="locked">locked</span> <span word="up">up</span> <span word="in">in</span> <span word="tooth">tooth</span> <span word="enamel">enamel</span> (珐琅质), <span word="two">two</span> <span word="researchers">researchers</span> <span word="argue">argue</span> <span word="against">against</span> <span word="the">the</span> <span word="widely">widely</span> <span word="held">held</span> <span word="belief">belief</span> <span word="that">that</span> <span word="hominids">hominids</span> <span word="ate">ate</span> <span word="little">little</span> <span word="more">more</span> <span word="than">than</span> <span word="fruits">fruits</span> <span word="and">and</span> <span word="leaves">leaves</span>. <span word="Sponheimer">Sponheimer</span> <span word="and">and</span> <span word="Julia">Julia</span> <span word="Lee">Lee</span>-<span word="Thorp">Thorp</span> <span word="of">of</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Cape">Cape</span> <span word="Town">Town</span>, <span word="South">South</span> <span word="Africa">Africa</span>, <span word="report">report</span> <span word="their">their</span> <span word="findings">findings</span> <span word="in">in</span> <span word="Friday">Friday</span>'<span word="s">s</span> <span word="Science">Science</span>.</p><p> <span word="There">There</span> <span word="aren">aren</span>'<span word="t">t</span> <span word="many">many</span>,<span word="clues">clues</span> <span word="for">for</span> <span word="us">us</span> <span word="to">to</span> <span word="know">know</span> <span word="the">the</span> <span word="life">life</span> <span word="of">of</span> <span word="early">early</span> <span word="hominids">hominids</span>. <span word="The">The</span> <span word="shape">shape</span> <span word="of">of</span> <span word="hominids">hominids</span>' <span word="teeth">teeth</span> <span word="offered">offered</span> <span word="the">the</span> <span word="first">first</span> <span word="clues">clues</span>. <span word="Large">Large</span> <span word="and">and</span> <span word="flatedged">flatedged</span> <span word="with">with</span> <span word="thick">thick</span> <span word="enamel">enamel</span>, <span word="they">they</span> <span word="looked">looked</span> <span word="perfect">perfect</span> <span word="for">for</span> <span word="eating">eating</span> <span word="nuts">nuts</span> <span word="and">and</span> <span word="fruits">fruits</span>, <span word="different">different</span> <span word="from">from</span> <span word="the">the</span> <span word="sharp">sharp</span> <span word="teeth">teeth</span> <span word="one">one</span> <span word="would">would</span> <span word="want">want</span> <span word="to">to</span> <span word="tear">tear</span> <span word="into">into</span> <span word="meat">meat</span> <span word="with">with</span>. <span word="The">The</span> <span word="first">first</span> <span word="stone">stone</span> <span word="tools">tools</span>, <span word="which">which</span> <span word="would">would</span> <span word="help">help</span> <span word="in">in</span> <span word="eating">eating</span> <span word="meat">meat</span>, <span word="didn">didn</span>'<span word="t">t</span> <span word="appear">appear</span> <span word="until">until</span> <span word="about">about</span> <span word="half">half</span> <span word="a">a</span> <span word="million">million</span> <span word="years">years</span> <span word="later">later</span>.</p><p> <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="also">also</span> <span word="found">found</span> <span word="marks">marks</span> <span word="on">on</span> <span word="hominids">hominids</span>' <span word="teeth">teeth</span> <span word="with">with</span> <span word="patterns">patterns</span> <span word="very">very</span> <span word="similar">similar</span> <span word="to">to</span> <span word="those">those</span> <span word="on">on</span> <span word="the">the</span> <span word="teeth">teeth</span> <span word="of">of</span> <span word="modernday">modernday</span> <span word="fruit">fruit</span> <span word="eaters">eaters</span>. <span word="Sponheimer">Sponheimer</span> <span word="and">and</span> <span word="Lee">Lee</span>-<span word="Thorp">Thorp</span> <span word="tried">tried</span> <span word="a">a</span> <span word="new">new</span> <span word="method">method</span>, <span word="looking">looking</span> <span word="at">at</span> <span word="the">the</span> <span word="chemical">chemical</span> <span word="composition">composition</span> <span word="of">of</span> <span word="the">the</span> <span word="tooth">tooth</span> <span word="enamel">enamel</span>. <span word="They">They</span> <span word="studied">studied</span> <span word="the">the</span> <span word="enamel">enamel</span> <span word="for">for</span> <span word="the">the</span> <span word="carbon">carbon</span>-13. <span word="Animals">Animals</span> <span word="that">that</span> <span word="eat">eat</span> <span word="grasses">grasses</span> <span word="have">have</span> <span word="higher">higher</span> <span word="carbon">carbon</span>-13 <span word="levels">levels</span> <span word="than">than</span> <span word="those">those</span> <span word="eating">eating</span> <span word="fruits">fruits</span> <span word="and">and</span> <span word="other">other</span> <span word="plants">plants</span>.</p><p> <span word="What">What</span> <span word="they">they</span> <span word="found">found</span> <span word="was">was</span> <span word="that">that</span> <span word="the">the</span> <span word="teeth">teeth</span> <span word="of">of</span> <span word="the">the</span> <span word="hominids">hominids</span> <span word="had">had</span> <span word="an">an</span> <span word="in">in</span>-<span word="between">between</span> <span word="amount">amount</span> <span word="of">of</span> <span word="carbon">carbon</span>-13, <span word="which">which</span> <span word="meant">meant</span> <span word="not">not</span> <span word="only">only</span> <span word="they">they</span> <span word="were">were</span> <span word="eating">eating</span> <span word="fruits">fruits</span>, <span word="they">they</span> <span word="were">were</span> <span word="eating">eating</span> <span word="a">a</span> <span word="lot">lot</span> <span word="of">of</span> <span word="grasses">grasses</span>, <span word="or">or</span> <span word="animals">animals</span> <span word="eating">eating</span> <span word="grasses">grasses</span>. <span word="The">The</span> <span word="lower">lower</span> <span word="carbon">carbon</span>-13 <span word="levels">levels</span> <span word="could">could</span> <span word="also">also</span> <span word="come">come</span> <span word="from">from</span> <span word="eating">eating</span> <span word="certain">certain</span> <span word="types">types</span> <span word="of">of</span> <span word="insects">insects</span> (昆虫).</p>
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