山西省2017高考英语二轮复习专题训练：阅读理解（78）
<p> 山西省2017高考英语二轮复习专题训练：阅读理解（78）</p><p> 阅读下面短文，从短文后所给各题的四个选项（<span word="A">A</span>、<span word="B">B</span>、<span word="C">C</span>和<span word="D">D</span>）中，选出可以填入空白处的最佳选项。</p><p> <span word="A">A</span></p><p> <span word="The">The</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span>’<span word="s">s</span> <span word="history">history</span> <span word="known">known</span> <span word="as">as</span> <span word="the">the</span> <span word="coal">coal</span> <span word="age">age</span> <span word="began">began</span> <span word="more">more</span> <span word="than">than</span> 250 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span> <span word="and">and</span> <span word="lasted">lasted</span> <span word="millions">millions</span> <span word="of">of</span> <span word="years">years</span>. <span word="During">During</span> <span word="that">that</span> <span word="time">time</span>, <span word="in">in</span> <span word="the">the</span> <span word="area">area</span> <span word="that">that</span> <span word="is">is</span> <span word="now">now</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>, <span word="coal">coal</span> <span word="beds">beds</span> <span word="formed">formed</span> <span word="from">from</span> <span word="Texas">Texas</span> <span word="to">to</span> <span word="the">the</span> <span word="north">north</span> <span word="Atlantic">Atlantic</span> <span word="coast">coast</span>.</p><p> <span word="A">A</span>t that time thick forests swamps（沼泽） covered much of the earth’s surface. Great trees died and fell into the swamps. Then they rotted （腐烂）and new trees and plants grew on top of them. The process repeated itself for thousands of years. The rotted plants turned into a substance called peat（泥炭）, which is still forming today in many swamps.</p><p> <span word="Meanwhile">Meanwhile</span> <span word="the">the</span> <span word="land">land</span> <span word="surface">surface</span> <span word="was">was</span> <span word="changing">changing</span>. <span word="Movement">Movement</span> <span word="in">in</span> <span word="the">the</span> <span word="earth">earth</span>’<span word="s">s</span> <span word="crust">crust</span> (地壳) <span word="pushed">pushed</span> <span word="up">up</span> <span word="hills">hills</span> <span word="in">in</span> <span word="some">some</span> <span word="places">places</span>, <span word="while">while</span> <span word="elsewhere">elsewhere</span> <span word="land">land</span> <span word="sank">sank</span>. <span word="Swift">Swift</span> <span word="rivers">rivers</span> <span word="ran">ran</span> <span word="from">from</span> <span word="the">the</span> <span word="hills">hills</span>; <span word="heavy">heavy</span> <span word="rains">rains</span> <span word="fell">fell</span> <span word="and">and</span> <span word="the">the</span> <span word="rivers">rivers</span> <span word="overflowed">overflowed</span>, <span word="leaving">leaving</span> <span word="muddy">muddy</span> <span word="sand">sand</span> <span word="in">in</span> <span word="the">the</span> <span word="sunken">sunken</span> <span word="wooded">wooded</span> <span word="places">places</span> <span word="and">and</span> <span word="swamps">swamps</span>. <span word="Oceans">Oceans</span>, <span word="too">too</span>, <span word="poured">poured</span> <span word="in">in</span> <span word="over">over</span> <span word="the">the</span> <span word="low">low</span>-<span word="lying">lying</span> <span word="land">land</span>, <span word="carrying">carrying</span> <span word="sand">sand</span> <span word="that">that</span> <span word="covered">covered</span> <span word="the">the</span> <span word="peaty">peaty</span> <span word="areas">areas</span>.</p><p> <span word="The">The</span> <span word="pressure">pressure</span> <span word="of">of</span> <span word="water">water</span> <span word="and">and</span> <span word="sand">sand</span> <span word="pressed">pressed</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="and">and</span> <span word="hydrogen">hydrogen</span> <span word="out">out</span> <span word="of">of</span> <span word="the">the</span> <span word="peat">peat</span>, <span word="leaving">leaving</span> <span word="carbon">carbon</span>. <span word="Under">Under</span> <span word="constant">constant</span> <span word="pressure">pressure</span>, <span word="the">the</span> <span word="rotted">rotted</span> <span word="material">material</span>, <span word="containing">containing</span> <span word="a">a</span> <span word="high">high</span> <span word="percentage">percentage</span> <span word="of">of</span> <span word="carbon">carbon</span>, <span word="formed">formed</span> <span word="gradually">gradually</span> <span word="into">into</span> <span word="coal">coal</span>.</p>
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