gre阅读练习每日一篇(三十)
<p> 掌握了<span word="gre">gre</span>阅读里的长难句，到了实战演习的时候了。<span word="gre">gre</span>阅读练习每日一篇帮助<span word="gre">gre</span>考生循序渐进地进行练习和总结。希望<span word="gre">gre</span>考生在进行<span word="gre">gre</span>阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。</p><p> <span word="Mycorrhizal">Mycorrhizal</span> <span word="fungi">fungi</span> <span word="infect">infect</span> <span word="more">more</span> <span word="plants">plants</span> <span word="than">than</span> <span word="do">do</span> <span word="any">any</span> <span word="other">other</span> <span word="fungi">fungi</span> <span word="and">and</span> <span word="are">are</span> <span word="necessary">necessary</span> <span word="for">for</span> <span word="many">many</span> <span word="plants">plants</span> <span word="to">to</span> <span word="thrive">thrive</span>, <span word="but">but</span> <span word="they">they</span> <span word="have">have</span> <span word="escaped">escaped</span> <span word="widespread">widespread</span> <span word="investigation">investigation</span> <span word="until">until</span> <span word="recently">recently</span> <span word="for">for</span> <span word="two">two</span> <span word="reasons">reasons</span>. <span word="First">First</span>, <span word="the">the</span> <span word="symbiotic">symbiotic</span> <span word="association">association</span> <span word="is">is</span> <span word="so">so</span> <span word="well">well</span>-<span word="balanced">balanced</span> <span word="that">that</span> <span word="the">the</span> <span word="roots">roots</span> <span word="of">of</span> <span word="host">host</span> <span word="plants">plants</span> <span word="show">show</span> <span word="no">no</span> <span word="damage">damage</span> <span word="even">even</span> <span word="when">when</span> <span word="densely">densely</span> <span word="infected">infected</span>. <span word="Second">Second</span>, <span word="the">the</span> <span word="fungi">fungi</span> <span word="cannot">cannot</span> <span word="as">as</span> <span word="yet">yet</span> <span word="be">be</span> <span word="cultivated">cultivated</span> <span word="in">in</span> <span word="the">the</span> <span word="absence">absence</span> <span word="of">of</span> <span word="a">a</span> <span word="living">living</span> <span word="root">root</span>. <span word="Despite">Despite</span> <span word="these">these</span> <span word="difficulties">difficulties</span>, <span word="there">there</span> <span word="has">has</span> <span word="been">been</span> <span word="important">important</span> <span word="new">new</span> <span word="work">work</span> <span word="that">that</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="this">this</span> <span word="symbiotic">symbiotic</span> <span word="association">association</span> <span word="can">can</span> <span word="be">be</span> <span word="harnessed">harnessed</span> <span word="to">to</span> <span word="achieve">achieve</span> <span word="more">more</span> <span word="economical">economical</span> <span word="use">use</span> <span word="of">of</span> <span word="costly">costly</span> <span word="superphosphate">superphosphate</span> <span word="fertilizer">fertilizer</span> <span word="and">and</span> <span word="to">to</span> <span word="permit">permit</span> <span word="better">better</span> <span word="exploitation">exploitation</span> <span word="of">of</span> <span word="cheaper">cheaper</span>, <span word="less">less</span> <span word="soluble">soluble</span> <span word="rock">rock</span> <span word="phosphate">phosphate</span>. <span word="Mycorrhizal">Mycorrhizal</span> <span word="benefits">benefits</span> <span word="are">are</span> <span word="not">not</span> <span word="limited">limited</span> <span word="to">to</span> <span word="improved">improved</span> <span word="phosphate">phosphate</span> <span word="uptake">uptake</span> <span word="in">in</span> <span word="host">host</span> <span word="plants">plants</span>. <span word="In">In</span> <span word="legumes">legumes</span>, <span word="mycorrhizal">mycorrhizal</span> <span word="inoculation">inoculation</span> <span word="has">has</span> <span word="increased">increased</span> <span word="nitrogen">nitrogen</span> <span word="fixation">fixation</span> <span word="beyond">beyond</span> <span word="levels">levels</span> <span word="achieved">achieved</span> <span word="by">by</span> <span word="adding">adding</span> <span word="phosphate">phosphate</span> <span word="fertilizer">fertilizer</span> ) <span word="alone">alone</span>. <span word="Certain">Certain</span> <span word="symbiotic">symbiotic</span> <span word="associations">associations</span> <span word="also">also</span> <span word="increase">increase</span> <span word="the">the</span> <span word="host">host</span> <span word="plants">plants</span> <span word="resistance">resistance</span> <span word="to">to</span> <span word="harmful">harmful</span> <span word="root">root</span> <span word="fungi">fungi</span>. <span word="Whether">Whether</span> <span word="this">this</span> <span word="resistance">resistance</span> <span word="results">results</span> <span word="from">from</span> <span word="exclusion">exclusion</span> <span word="of">of</span> <span word="harmful">harmful</span> <span word="fungi">fungi</span> <span word="through">through</span> <span word="competition">competition</span> <span word="for">for</span> <span word="sites">sites</span>, <span word="from">from</span> <span word="metabolic">metabolic</span> <span word="change">change</span> <span word="involving">involving</span> <span word="antibiotic">antibiotic</span> <span word="production">production</span>, <span word="or">or</span> <span word="from">from</span> <span word="increased">increased</span> <span word="vigor">vigor</span> <span word="is">is</span> <span word="undetermined">undetermined</span>.</p><p> 17. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="most">most</span> <span word="accurately">accurately</span> <span word="describes">describes</span> <span word="the">the</span> <span word="passage">passage</span>?</p>
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