2016年新GRE考试阅读理解模拟试题(五)
<p>考试吧整理了“2016年新<span word="GRE">GRE</span>考试阅读理解模拟试题(五)”供考生参考，更多关于<span word="GRE">GRE</span>考试模拟试题相关信息，请访问考试吧<span word="GRE">GRE</span>考试网。 </p><p> 查看汇总：2016年新<span word="GRE">GRE</span>考试阅读理解模拟试题汇总</p><p> <span word="Many">Many</span> <span word="theories">theories</span> <span word="have">have</span> <span word="been">been</span> <span word="formulated">formulated</span> <span word="to">to</span> <span word="explain">explain</span> <span word="the">the</span> <span word="role">role</span> <span word="of">of</span> <span word="grazers">grazers</span> <span word="such">such</span> <span word="as">as</span> <span word="zooplankton">zooplankton</span> <span word="in">in</span> <span word="controlling">controlling</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="planktonic">planktonic</span> <span word="algae">algae</span> (<span word="phytoplankton">phytoplankton</span>)<span word="in">in</span> <span word="lakes">lakes</span>. <span word="The">The</span> <span word="first">first</span> <span word="theories">theories</span> <span word="of">of</span> <span word="such">such</span> <span word="grazer">grazer</span> <span word="control">control</span> <span word="were">were</span> <span word="merely">merely</span> <span word="based">based</span> <span word="on">on</span> <span word="observations">observations</span> <span word="of">of</span> <span word="negative">negative</span> <span word="correlations">correlations</span> <span word="between">between</span> <span word="algal">algal</span> <span word="and">and</span> <span word="zooplankton">zooplankton</span> <span word="numbers">numbers</span>. <span word="A">A</span> <span word="low">low</span> <span word="number">number</span> <span word="of">of</span> <span word="algal">algal</span> <span word="cells">cells</span> <span word="in">in</span> <span word="the">the</span> <span word="presence">presence</span> <span word="of">of</span> <span word="a">a</span> <span word="high">high</span> <span word="number">number</span> <span word="of">of</span> <span word="grazers">grazers</span> <span word="suggested">suggested</span>, <span word="but">but</span> <span word="did">did</span> <span word="not">not</span> <span word="prove">prove</span>, <span word="that">that</span> <span word="the">the</span> <span word="grazers">grazers</span> <span word="had">had</span> <span word="removed">removed</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="algae">algae</span>. <span word="The">The</span> <span word="converse">converse</span> <span word="observation">observation</span>, <span word="of">of</span> <span word="the">the</span> <span word="absence">absence</span> <span word="of">of</span> <span word="grazers">grazers</span> <span word="in">in</span> <span word="areas">areas</span> <span word="of">of</span> <span word="high">high</span> <span word="phytoplankton">phytoplankton</span> <span word="concentration">concentration</span>, <span word="led">led</span> <span word="Hardy">Hardy</span> <span word="to">to</span> <span word="propose">propose</span> <span word="his">his</span> <span word="principle">principle</span> <span word="of">of</span> <span word="animal">animal</span> <span word="exclusion">exclusion</span>, <span word="which">which</span> <span word="hypothesized">hypothesized</span> <span word="that">that</span> <span word="phytoplankton">phytoplankton</span> <span word="produced">produced</span> <span word="a">a</span> <span word="repellent">repellent</span> <span word="that">that</span> <span word="excluded">excluded</span> <span word="grazers">grazers</span> <span word="from">from</span> <span word="regions">regions</span> <span word="of">of</span> <span word="high">high</span> <span word="phytoplankton">phytoplankton</span> <span word="concentration">concentration</span>. <span word="This">This</span> <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="suggestion">suggestion</span> <span word="of">of</span> <span word="algal">algal</span> <span word="defenses">defenses</span> <span word="against">against</span> <span word="grazing">grazing</span>.</p><p> <span word="Perhaps">Perhaps</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span> <span word="many">many</span> <span word="of">of</span> <span word="these">these</span> <span word="first">first</span> <span word="studies">studies</span> <span word="considered">considered</span> <span word="only">only</span> <span word="algae">algae</span> <span word="of">of</span> <span word="a">a</span> <span word="size">size</span> <span word="that">that</span> <span word="could">could</span> <span word="be">be</span> <span word="collected">collected</span> <span word="in">in</span> <span word="a">a</span> <span word="net">net</span> (<span word="net">net</span> <span word="phytoplankton">phytoplankton</span>), <span word="a">a</span> <span word="practice">practice</span> <span word="that">that</span> <span word="overlooked">overlooked</span> <span word="the">the</span> <span word="smaller">smaller</span> <span word="phytoplankton">phytoplankton</span> (<span word="nannoplankton">nannoplankton</span>)<span word="that">that</span> <span word="we">we</span> <span word="now">now</span> <span word="know">know</span> <span word="grazers">grazers</span> <span word="are">are</span> <span word="most">most</span> <span word="likely">likely</span> <span word="to">to</span> <span word="feed">feed</span> <span word="on">on</span>, <span word="led">led</span> <span word="to">to</span> <span word="a">a</span> <span word="de">de</span>-<span word="emphasis">emphasis</span> <span word="of">of</span> <span word="the">the</span> <span word="role">role</span> <span word="of">of</span> <span word="grazers">grazers</span> <span word="in">in</span> <span word="subsequent">subsequent</span> <span word="research">research</span>. <span word="Increasingly">Increasingly</span>, <span word="as">as</span> <span word="in">in</span> <span word="the">the</span> <span word="individual">individual</span> <span word="studies">studies</span> <span word="of">of</span> <span word="Lund">Lund</span>, <span word="Round">Round</span>, <span word="and">and</span> <span word="Reynolds">Reynolds</span>, <span word="researchers">researchers</span> <span word="began">began</span> <span word="to">to</span> <span word="stress">stress</span> <span word="the">the</span> <span word="importance">importance</span> <span word="of">of</span> <span word="environmental">environmental</span> <span word="factors">factors</span> <span word="such">such</span> <span word="as">as</span> <span word="temperature">temperature</span>, <span word="light">light</span>, <span word="and">and</span> <span word="water">water</span> <span word="movements">movements</span> <span word="in">in</span> <span word="controlling">controlling</span> <span word="algal">algal</span> <span word="numbers">numbers</span>. <span word="These">These</span> <span word="environmental">environmental</span> <span word="factors">factors</span> <span word="were">were</span> <span word="amenable">amenable</span> <span word="to">to</span> <span word="field">field</span> <span word="monitoring">monitoring</span> <span word="and">and</span> <span word="to">to</span> <span word="simulation">simulation</span> <span word="in">in</span> <span word="the">the</span> <span word="laboratory">laboratory</span>. <span word="Grazing">Grazing</span> <span word="was">was</span> <span word="believed">believed</span> <span word="to">to</span> <span word="have">have</span> <span word="some">some</span> <span word="effect">effect</span> <span word="on">on</span> <span word="algal">algal</span> <span word="numbers">numbers</span>, <span word="especially">especially</span> <span word="after">after</span> <span word="phytoplankton">phytoplankton</span> <span word="growth">growth</span> <span word="rates">rates</span> <span word="declined">declined</span> <span word="at">at</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="bloom">bloom</span> <span word="periods">periods</span>, <span word="but">but</span> <span word="grazing">grazing</span> <span word="was">was</span> <span word="considered">considered</span> <span word="a">a</span> <span word="minor">minor</span> <span word="component">component</span> <span word="of">of</span> <span word="models">models</span> <span word="that">that</span> <span word="predicted">predicted</span> <span word="algal">algal</span> <span word="population">population</span> <span word="dynamics">dynamics</span>.</p>
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