gre阅读练习每日一篇(十一)
<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="Although">Although</span> <span word="pathogenic">pathogenic</span> <span word="organisms">organisms</span> <span word="constantly">constantly</span> <span word="alight">alight</span> <span word="on">on</span> <span word="the">the</span> <span word="skin">skin</span>, <span word="they">they</span> <span word="find">find</span> <span word="it">it</span> <span word="a">a</span> <span word="very">very</span> <span word="unfavorable">unfavorable</span> <span word="environment">environment</span> <span word="and">and</span>, <span word="in">in</span> <span word="the">the</span> <span word="absence">absence</span> <span word="of">of</span> <span word="injury">injury</span>, <span word="have">have</span> <span word="great">great</span> <span word="difficulty">difficulty</span> <span word="colonizing">colonizing</span> <span word="it">it</span>. <span word="This">This</span> <span word="self">self</span>-<span word="sterilizing">sterilizing</span> <span word="capacity">capacity</span> <span word="of">of</span> <span word="the">the</span> <span word="skin">skin</span> <span word="results">results</span> <span word="from">from</span> <span word="the">the</span> <span word="tendency">tendency</span> <span word="of">of</span> <span word="all">all</span> <span word="well">well</span>-<span word="developed">developed</span> <span word="ecosystems">ecosystems</span> <span word="toward">toward</span> <span word="homeostasis">homeostasis</span>, <span word="or">or</span> <span word="the">the</span> <span word="maintenance">maintenance</span> <span word="of">of</span> <span word="the">the</span> <span word="status">status</span> <span word="quo">quo</span>.</p><p> <span word="Species">Species</span> <span word="that">that</span> <span word="typically">typically</span> <span word="live">live</span> <span word="in">in</span> <span word="soil">soil</span>, <span word="water">water</span>, <span word="and">and</span> <span word="elsewhere">elsewhere</span> <span word="rarely">rarely</span> <span word="multiply">multiply</span> <span word="on">on</span> <span word="the">the</span> <span word="skin">skin</span>. <span word="Undamaged">Undamaged</span> <span word="skin">skin</span> <span word="is">is</span> <span word="also">also</span> <span word="unfavorable">unfavorable</span> <span word="to">to</span> <span word="most">most</span> <span word="human">human</span> <span word="pathogens">pathogens</span>. <span word="The">The</span> <span word="skin">skin</span> <span word="is">is</span> <span word="too">too</span> <span word="acid">acid</span> <span word="and">and</span> <span word="too">too</span> <span word="arid">arid</span> <span word="for">for</span> <span word="some">some</span> <span word="species">species</span>. <span word="The">The</span> <span word="constant">constant</span> <span word="shedding">shedding</span> <span word="of">of</span> <span word="the">the</span> <span word="surface">surface</span> <span word="skin">skin</span> <span word="layers">layers</span> <span word="further">further</span> <span word="hinders">hinders</span> <span word="the">the</span> <span word="establishment">establishment</span> <span word="of">of</span> <span word="invaders">invaders</span>. <span word="The">The</span> <span word="most">most</span> <span word="interesting">interesting</span> <span word="defense">defense</span> <span word="mechanism">mechanism</span>, <span word="however">however</span>, <span word="results">results</span> <span word="from">from</span> <span word="the">the</span> <span word="metabolic">metabolic</span> <span word="activities">activities</span> <span word="of">of</span> <span word="the">the</span> <span word="resident">resident</span> <span word="flora">flora</span> . <span word="Unsaturated">Unsaturated</span> <span word="fatty">fatty</span> <span word="acids">acids</span>, <span word="an">an</span> <span word="important">important</span> <span word="component">component</span> <span word="of">of</span> <span word="the">the</span> <span word="lipids">lipids</span> <span word="in">in</span> <span word="sebum">sebum</span> <span word="collected">collected</span> <span word="from">from</span> <span word="the">the</span> <span word="skin">skin</span> <span word="surface">surface</span>, <span word="inhibit">inhibit</span> <span word="the">the</span> <span word="growth">growth</span> <span word="of">of</span> <span word="several">several</span> <span word="bacterial">bacterial</span> <span word="and">and</span> <span word="fungal">fungal</span> <span word="cutaneous">cutaneous</span> <span word="pathogens">pathogens</span>. <span word="These">These</span> <span word="acids">acids</span> <span word="are">are</span> <span word="a">a</span> <span word="metabolic">metabolic</span> <span word="product">product</span> <span word="of">of</span> <span word="certain">certain</span> <span word="gram">gram</span>-<span word="positive">positive</span> <span word="members">members</span> <span word="of">of</span> <span word="the">the</span> <span word="cutaneous">cutaneous</span> <span word="community">community</span>, <span word="which">which</span> <span word="break">break</span> <span word="down">down</span> <span word="the">the</span> <span word="more">more</span> <span word="complex">complex</span> <span word="lipids">lipids</span> <span word="in">in</span> <span word="freshly">freshly</span> <span word="secreted">secreted</span> <span word="sebum">sebum</span>.</p><p> 17. <span word="The">The</span> <span word="primary">primary</span> <span word="purpose">purpose</span> <span word="of">of</span> <span word="the">the</span> <span word="passage">passage</span> <span word="is">is</span> <span word="to">to</span></p>
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