2014年职称英语考试(理工类)完形填空题二级重点文章(1)
<p> 二级文章(题库未考查文章)</p><p> <span word="Avalanche">Avalanche</span> <span word="and">and</span> <span word="Its">Its</span> <span word="Safety">Safety</span></p><p> <span word="An">An</span> <span word="avalanche">avalanche</span> <span word="is">is</span> <span word="a">a</span> <span word="sudden">sudden</span> <span word="and">and</span> <span word="rapid">rapid</span> <span word="flow">flow</span> <span word="of">of</span> <span word="snow">snow</span>, <span word="often">often</span> <span word="mixed">mixed</span> <span word="with">with</span> <span word="air">air</span> <span word="and">and</span> <span word="water">water</span>, <span word="down">down</span> <span word="a">a</span> <span word="mountainside">mountainside</span>. <span word="Avalanches">Avalanches</span> <span word="are">are</span> <span word="among">among</span> <span word="the">the</span> <span word="biggest">biggest</span> <span word="dangers">dangers</span> <span word="in">in</span> <span word="the">the</span> <span word="mountains">mountains</span> <span word="for">for</span> <span word="both">both</span> <span word="life">life</span> <span word="and">and</span> <span word="property">property</span>.</p><p> <span word="All">All</span> <span word="avalanches">avalanches</span> <span word="are">are</span> <span word="caused">caused</span> <span word="by">by</span> <span word="an">an</span> <span word="over">over</span>-<span word="burden">burden</span> <span word="of">of</span> <span word="material">material</span>, <span word="typically">typically</span> <span word="snowpack">snowpack</span>, <span word="that">that</span> <span word="is">is</span> <span word="too">too</span> <span word="massive">massive</span> <span word="and">and</span> <span word="unstable">unstable</span> <span word="for">for</span> <span word="the">the</span> <span word="slope">slope</span> <span word="that">that</span> <span word="supports">supports</span> <span word="it">it</span>. <span word="Determining">Determining</span> <span word="the">the</span> <span word="critical">critical</span> <span word="load">load</span>, <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="over">over</span>-<span word="burden">burden</span> <span word="which">which</span> <span word="is">is</span> <span word="likely">likely</span> <span word="to">to</span> <span word="cause">cause</span> <span word="an">an</span> <span word="avalanche">avalanche</span>, <span word="is">is</span> <span word="a">a</span> <span word="complex">complex</span> <span word="task">task</span> <span word="involving">involving</span> <span word="the">the</span> <span word="evaluation">evaluation</span> <span word="of">of</span> <span word="a">a</span> <span word="number">number</span> <span word="of">of</span> <span word="factors">factors</span>.</p><p> <span word="Terrain">Terrain</span> <span word="slopes">slopes</span> <span word="flatter">flatter</span> <span word="than">than</span> 25 <span word="degrees">degrees</span> <span word="or">or</span> <span word="steeper">steeper</span> <span word="than">than</span> 60 <span word="degrees">degrees</span> <span word="typically">typically</span> <span word="have">have</span> <span word="a">a</span> <span word="low">low</span> <span word="risk">risk</span> <span word="of">of</span> <span word="avalanche">avalanche</span>. <span word="Snow">Snow</span> <span word="does">does</span> <span word="not">not</span> <span word="gather">gather</span> <span word="significantly">significantly</span> <span word="on">on</span> <span word="steep">steep</span> <span word="slopes">slopes</span>; <span word="also">also</span>, <span word="snow">snow</span> <span word="does">does</span> <span word="not">not</span> <span word="flow">flow</span> <span word="easily">easily</span> <span word="on">on</span> <span word="flat">flat</span> <span word="slopes">slopes</span>. <span word="Human">Human</span>-<span word="triggered">triggered</span> <span word="avalanches">avalanches</span> <span word="have">have</span> <span word="the">the</span> <span word="greatest">greatest</span> <span word="incidence">incidence</span> <span word="when">when</span> <span word="the">the</span> <span word="snows">snows</span> <span word="angle">angle</span> <span word="of">of</span> <span word="rest">rest</span> <span word="is">is</span> <span word="between">between</span> 35 <span word="and">and</span> 45 <span word="degrees">degrees</span>; <span word="the">the</span> <span word="critical">critical</span> <span word="angle">angle</span>, <span word="the">the</span> <span word="angle">angle</span> <span word="at">at</span> <span word="which">which</span> <span word="the">the</span> <span word="human">human</span> <span word="incidence">incidence</span> <span word="of">of</span> <span word="avalanches">avalanches</span> <span word="is">is</span> <span word="greatest">greatest</span>, <span word="is">is</span> 38 <span word="degrees">degrees</span>. <span word="The">The</span> <span word="rule">rule</span> <span word="of">of</span> <span word="thumb">thumb</span> <span word="is">is</span>: <span word="A">A</span> <span word="slope">slope</span> <span word="that">that</span> <span word="is">is</span> <span word="flat">flat</span> <span word="enough">enough</span> <span word="to">to</span> <span word="hold">hold</span> <span word="snow">snow</span> <span word="but">but</span> <span word="steep">steep</span> <span word="enough">enough</span> <span word="to">to</span> <span word="ski">ski</span> <span word="has">has</span> <span word="the">the</span> <span word="potential">potential</span> <span word="to">to</span> <span word="generate">generate</span> <span word="an">an</span> <span word="avalanche">avalanche</span>, <span word="regardless">regardless</span> <span word="of">of</span> <span word="the">the</span> <span word="angle">angle</span>. <span word="Additionally">Additionally</span>, <span word="avalanche">avalanche</span> <span word="risk">risk</span> <span word="increases">increases</span> <span word="with">with</span> <span word="use">use</span> ; <span word="that">that</span> <span word="is">is</span>, <span word="the">the</span> <span word="more">more</span> <span word="a">a</span> <span word="slope">slope</span> <span word="is">is</span> <span word="disturbed">disturbed</span> <span word="by">by</span> <span word="skiers">skiers</span>, <span word="the">the</span> <span word="more">more</span> <span word="likely">likely</span> <span word="it">it</span> <span word="is">is</span> <span word="that">that</span> <span word="an">an</span> <span word="avalanche">avalanche</span> <span word="will">will</span> <span word="occur">occur</span>.</p>
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