2017届河南省南乐县高考英语一轮复习阅读理解训练：8（含解析）
<p> 河南南乐县2017高考英语一轮阅读理解基础训练8</p><p> 【2016高考训练题】阅读下列短文，从每题所给的四个选项（<span word="A">A</span>、<span word="B">B</span>、<span word="C">C</span>、<span word="D">D</span>）中，选出最佳选项。</p><p> <span word="As">As</span> <span word="with">with</span> <span word="every">every</span> <span word="other">other</span> <span word="invasive">invasive</span>（入侵的）<span word="species">species</span>, <span word="introducing">introducing</span> <span word="worms">worms</span> <span word="to">to</span> <span word="an">an</span> <span word="ecosystem">ecosystem</span>（生态系统）<span word="that">that</span> <span word="developed">developed</span> <span word="without">without</span> <span word="them">them</span> <span word="has">has</span> <span word="an">an</span> <span word="effect">effect</span> <span word="on">on</span> <span word="everything">everything</span> <span word="that">that</span> <span word="lives">lives</span> <span word="there">there</span>.</p><p> <span word="This">This</span> <span word="concern">concern</span> <span word="is">is</span> <span word="very">very</span> <span word="clear">clear</span> <span word="in">in</span> <span word="the">the</span> <span word="Great">Great</span> <span word="Lakes">Lakes</span> <span word="region">region</span>. <span word="Non">Non</span> — <span word="native">native</span> <span word="earthworms">earthworms</span>（蚯蚓）<span word="have">have</span> <span word="been">been</span> <span word="in">in</span> <span word="North">North</span> <span word="America">America</span> <span word="for">for</span> <span word="a">a</span> <span word="couple">couple</span> <span word="hundred">hundred</span> <span word="years">years</span>, <span word="brought">brought</span> <span word="over">over</span> <span word="from">from</span> <span word="Europe">Europe</span> <span word="with">with</span> <span word="soils">soils</span> <span word="and">and</span> <span word="plants">plants</span>. <span word="More">More</span> <span word="recently">recently</span>, <span word="Asian">Asian</span> <span word="species">species</span>, <span word="sold">sold</span> <span word="as">as</span> <span word="fishing">fishing</span> <span word="bait">bait</span>（饵料）, <span word="have">have</span> <span word="started">started</span> <span word="to">to</span> <span word="spread">spread</span> <span word="in">in</span> <span word="the">the</span> <span word="Great">Great</span> <span word="Lakes">Lakes</span> <span word="region">region</span>, <span word="where">where</span> <span word="there">there</span> <span word="are">are</span> <span word="no">no</span> <span word="native">native</span> <span word="earthworms">earthworms</span>.</p><p> <span word="In">In</span> <span word="these">these</span> <span word="earthworm">earthworm</span>-<span word="free">free</span> <span word="forests">forests</span>, <span word="when">when</span> <span word="leaves">leaves</span> <span word="fall">fall</span> <span word="onto">onto</span> <span word="the">the</span> <span word="forest">forest</span> <span word="floor">floor</span> <span word="and">and</span> <span word="plants">plants</span> <span word="and">and</span> <span word="animals">animals</span> <span word="die">die</span>, <span word="they">they</span> <span word="build">build</span> <span word="up">up</span> <span word="into">into</span> <span word="what">what</span>’<span word="s">s</span> <span word="called">called</span> <span word="the">the</span> <span word="duff">duff</span>（腐殖质）<span word="layer">layer</span>. <span word="In">In</span> <span word="this">this</span> <span word="area">area</span>, <span word="it">it</span> <span word="was">was</span> <span word="just">just</span> <span word="bacteria">bacteria</span> <span word="that">that</span> <span word="broke">broke</span> <span word="down">down</span> <span word="the">the</span> <span word="organic">organic</span> <span word="material">material</span> <span word="for">for</span> <span word="plants">plants</span> <span word="to">to</span> <span word="consume">consume</span> <span word="and">and</span> <span word="take">take</span> <span word="up">up</span>. <span word="Earthworms">Earthworms</span> <span word="come">come</span> <span word="in">in</span>, <span word="they">they</span> <span word="do">do</span> <span word="their">their</span> <span word="job">job</span> <span word="and">and</span> <span word="do">do</span> <span word="it">it</span> <span word="extremely">extremely</span> <span word="well">well</span> — <span word="they">they</span> <span word="take">take</span> <span word="that">that</span> <span word="forest">forest</span> <span word="floor">floor</span> <span word="and">and</span> <span word="turn">turn</span> <span word="it">it</span> <span word="into">into</span> <span word="the">the</span> <span word="rich">rich</span> <span word="black">black</span> <span word="soil">soil</span> <span word="you">you</span> <span word="find">find</span> <span word="in">in</span> <span word="your">your</span> <span word="garden">garden</span>.</p><p> <span word="That">That</span> <span word="sounds">sounds</span> <span word="great">great</span>-<span word="but">but</span> <span word="the">the</span> <span word="local">local</span> <span word="plants">plants</span> <span word="and">and</span> <span word="animals">animals</span> <span word="in">in</span> <span word="the">the</span> <span word="Great">Great</span> <span word="Lakes">Lakes</span> <span word="region">region</span> <span word="are">are</span> <span word="used">used</span> <span word="to">to</span> <span word="living">living</span> <span word="with">with</span> <span word="the">the</span> <span word="duff">duff</span> <span word="layer">layer</span>, <span word="not">not</span> <span word="in">in</span> <span word="the">the</span> <span word="rich">rich</span> <span word="soil">soil</span> <span word="associated">associated</span> <span word="with">with</span> <span word="earthworms">earthworms</span>. <span word="In">In</span> <span word="addition">addition</span>, <span word="the">the</span> <span word="rich">rich</span> <span word="top">top</span> <span word="soil">soil</span> <span word="left">left</span> <span word="by">by</span> <span word="earthworms">earthworms</span> <span word="can">can</span> <span word="wash">wash</span> <span word="out">out</span> <span word="in">in</span> <span word="a">a</span> <span word="heavy">heavy</span> <span word="rain">rain</span>. <span word="The">The</span> <span word="differently">differently</span> <span word="produced">produced</span> <span word="soil">soil</span> <span word="is">is</span> <span word="a">a</span> <span word="problem">problem</span> <span word="as">as</span> <span word="well">well</span>. <span word="There">There</span>’<span word="s">s</span> <span word="a">a</span> <span word="mat">mat</span> <span word="of">of</span> <span word="fine">fine</span> <span word="roots">roots</span> <span word="in">in</span> <span word="that">that</span> <span word="duff">duff</span> <span word="layer">layer</span>-<span word="that">that</span>’<span word="s">s</span> <span word="where">where</span> <span word="a">a</span> <span word="lot">lot</span> <span word="of">of</span> <span word="our">our</span> <span word="native">native</span> <span word="plants">plants</span> <span word="put">put</span> <span word="their">their</span> <span word="root">root</span> <span word="system">system</span>. <span word="When">When</span> <span word="that">that</span> <span word="duff">duff</span> <span word="is">is</span> <span word="gone">gone</span>, <span word="it">it</span>’<span word="s">s</span> <span word="a">a</span> <span word="lot">lot</span> <span word="harder">harder</span> <span word="for">for</span> <span word="them">them</span> <span word="to">to</span> <span word="put">put</span> <span word="their">their</span> <span word="roots">roots</span> <span word="into">into</span> <span word="the">the</span> <span word="mineral">mineral</span>（矿物质的）<span word="soil">soil</span>.</p>
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