GRE写作范文——Obtaining Fresh water from icebergs
<p> <span word="The">The</span> <span word="concept">concept</span> <span word="of">of</span> <span word="obtaining">obtaining</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="from">from</span> <span word="icebergs">icebergs</span> <span word="that">that</span> <span word="are">are</span> <span word="towed">towed</span> <span word="to">to</span> <span word="populated">populated</span> <span word="areas">areas</span> <span word="and">and</span> <span word="arid">arid</span> <span word="regions">regions</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span> <span word="was">was</span> <span word="once">once</span> <span word="treated">treated</span> <span word="as">as</span> <span word="a">a</span> <span word="joke">joke</span> <span word="more">more</span> <span word="appropriate">appropriate</span> <span word="to">to</span> <span word="cartoons">cartoons</span> <span word="than">than</span> <span word="real">real</span> <span word="life">life</span>. <span word="But">But</span> <span word="now">now</span> <span word="it">it</span> <span word="is">is</span> <span word="being">being</span> <span word="considered">considered</span> <span word="quite">quite</span> <span word="seriously">seriously</span> <span word="by">by</span> <span word="many">many</span> <span word="nations">nations</span>, <span word="especially">especially</span> <span word="since">since</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="warned">warned</span> <span word="that">that</span> <span word="the">the</span> <span word="human">human</span> <span word="race">race</span> <span word="will">will</span> <span word="outgrow">outgrow</span> <span word="its">its</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="supply">supply</span> <span word="faster">faster</span> <span word="than">than</span> <span word="it">it</span> <span word="runs">runs</span> <span word="out">out</span> <span word="of">of</span> <span word="food">food</span>.</p><p> <span word="Glaciers">Glaciers</span> <span word="are">are</span> <span word="a">a</span> <span word="possible">possible</span> <span word="source">source</span> <span word="of">of</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="that">that</span> <span word="has">has</span> <span word="been">been</span> <span word="overlooked">overlooked</span> <span word="until">until</span> <span word="recently">recently</span>. <span word="Three">Three</span>-<span word="quarters">quarters</span> <span word="of">of</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="supply">supply</span> <span word="is">is</span> <span word="still">still</span> <span word="tied">tied</span> <span word="up">up</span> <span word="in">in</span> <span word="glacial">glacial</span> <span word="ice">ice</span>, <span word="a">a</span> <span word="reservoir">reservoir</span> <span word="of">of</span> <span word="untapped">untapped</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="so">so</span> <span word="immense">immense</span> <span word="that">that</span> <span word="it">it</span> <span word="could">could</span> <span word="sustain">sustain</span> <span word="all">all</span> <span word="the">the</span> <span word="rivers">rivers</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span> <span word="for">for</span> 1,000 <span word="years">years</span>. <span word="Floating">Floating</span> <span word="on">on</span> <span word="the">the</span> <span word="oceans">oceans</span> <span word="every">every</span> <span word="year">year</span> <span word="are">are</span> 7,659 <span word="trillion">trillion</span> <span word="metric">metric</span> <span word="tons">tons</span> <span word="of">of</span> <span word="ice">ice</span> <span word="encased">encased</span> <span word="in">in</span> 10000 <span word="icebergs">icebergs</span> <span word="that">that</span> <span word="break">break</span> <span word="away">away</span> <span word="from">from</span> <span word="the">the</span> <span word="polar">polar</span> <span word="ice">ice</span> <span word="caps">caps</span>, <span word="more">more</span> <span word="than">than</span> <span word="ninety">ninety</span> <span word="percent">percent</span> <span word="of">of</span> <span word="them">them</span> <span word="from">from</span> <span word="Antarctica">Antarctica</span>.</p><p> <span word="Huge">Huge</span> <span word="glaciers">glaciers</span> <span word="that">that</span> <span word="stretch">stretch</span> <span word="over">over</span> <span word="the">the</span> <span word="shallow">shallow</span> <span word="continental">continental</span> <span word="shelf">shelf</span> <span word="give">give</span> <span word="birth">birth</span> <span word="to">to</span> <span word="icebergs">icebergs</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="year">year</span>. <span word="Icebergs">Icebergs</span> <span word="are">are</span> <span word="not">not</span> <span word="like">like</span> <span word="sea">sea</span> <span word="ice">ice</span>, <span word="which">which</span> <span word="is">is</span> <span word="formed">formed</span> <span word="when">when</span> <span word="the">the</span> <span word="sea">sea</span> <span word="itself">itself</span> <span word="freezes">freezes</span>, <span word="rather">rather</span>, <span word="they">they</span> <span word="are">are</span> <span word="formed">formed</span> <span word="entirely">entirely</span> <span word="on">on</span> <span word="land">land</span>, <span word="breaking">breaking</span> <span word="off">off</span> <span word="when">when</span> <span word="glaciers">glaciers</span> <span word="spread">spread</span> <span word="over">over</span> <span word="the">the</span> <span word="sea">sea</span>. <span word="As">As</span> <span word="they">they</span> <span word="drift">drift</span> <span word="away">away</span> <span word="from">from</span> <span word="the">the</span> <span word="polar">polar</span> <span word="region">region</span>, <span word="icebergs">icebergs</span> <span word="sometimes">sometimes</span> <span word="move">move</span> <span word="mysteriously">mysteriously</span> <span word="in">in</span> <span word="a">a</span> <span word="direction">direction</span> <span word="opposite">opposite</span> <span word="to">to</span> <span word="the">the</span> <span word="wind">wind</span>, <span word="pulled">pulled</span> <span word="by">by</span> <span word="subsurface">subsurface</span> <span word="currents">currents</span>. <span word="Because">Because</span> <span word="they">they</span> <span word="melt">melt</span> <span word="more">more</span> <span word="slowly">slowly</span> <span word="than">than</span> <span word="smaller">smaller</span> <span word="pieces">pieces</span> <span word="of">of</span> <span word="ice">ice</span>, <span word="icebergs">icebergs</span> <span word="have">have</span> <span word="been">been</span> <span word="known">known</span> <span word="to">to</span> <span word="drift">drift</span> <span word="as">as</span> <span word="far">far</span> <span word="north">north</span> <span word="as">as</span> 35 <span word="degrees">degrees</span> <span word="south">south</span> <span word="of">of</span> <span word="the">the</span> <span word="equator">equator</span> <span word="in">in</span> <span word="the">the</span> <span word="Atlantic">Atlantic</span> <span word="Ocean">Ocean</span>. <span word="To">To</span> <span word="corral">corral</span> <span word="them">them</span> <span word="and">and</span> <span word="steer">steer</span> <span word="them">them</span> <span word="to">to</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span> <span word="where">where</span> <span word="they">they</span> <span word="are">are</span> <span word="needed">needed</span> <span word="would">would</span> <span word="not">not</span> <span word="be">be</span> <span word="too">too</span> <span word="difficult">difficult</span>.</p>
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