2013职称英语理工类完形填空习题及答案(3)
<p> <span word="Solar">Solar</span> <span word="photovoltaic">photovoltaic</span> <span word="thermal">thermal</span> <span word="energy">energy</span> <span word="systems">systems</span>1, <span word="or">or</span> <span word="PVTs">PVTs</span>, <span word="generate">generate</span> <span word="both">both</span> <span word="heat">heat</span> <span word="and">and</span> <span word="electricity">electricity</span>, <span word="but">but</span> <span word="l">l</span> <span word="now">now</span> <span word="they">they</span>2 <span word="havent">havent</span> <span word="been">been</span> <span word="very">very</span> <span word="good">good</span> <span word="at">at</span> <span word="the">the</span> <span word="heat">heat</span>-<span word="generating">generating</span> <span word="part">part</span> <span word="compared">compared</span> <span word="to">to</span> <span word="a">a</span> <span word="stand">stand</span>-<span word="alone">alone</span>3 <span word="solar">solar</span> <span word="thermal">thermal</span> <span word="collector">collector</span>. <span word="Thats">Thats</span> <span word="because">because</span> <span word="they">they</span> <span word="operate">operate</span> <span word="at">at</span> <span word="low">low</span> <span word="temperatures">temperatures</span> <span word="to">to</span> <span word="cool">cool</span> <span word="crystalline">crystalline</span> <span word="silicon">silicon</span> <span word="solar">solar</span> <span word="cells">cells</span>4, <span word="which">which</span>5 1<span word="ets">ets</span> <span word="the">the</span> <span word="silicon">silicon</span> <span word="generate">generate</span> <span word="more">more</span> 2 <span word="but">but</span> <span word="isnt">isnt</span> <span word="a">a</span> <span word="very">very</span> <span word="efficient">efficient</span> <span word="way">way</span> <span word="to">to</span> <span word="gather">gather</span> <span word="heat">heat</span>.</p><p> <span word="Thats">Thats</span> <span word="a">a</span> <span word="problem">problem</span> <span word="of">of</span> 3 <span word="Good">Good</span> <span word="solar">solar</span> <span word="hot">hot</span>-<span word="water">water</span> <span word="systems">systems</span> <span word="can">can</span> <span word="harvest">harvest</span> <span word="much">much</span> <span word="more">more</span> <span word="energy">energy</span> <span word="than">than</span> <span word="a">a</span> <span word="solar">solar</span>-<span word="electric">electric</span> <span word="system">system</span> <span word="at">at</span> <span word="a">a</span> <span word="substantially">substantially</span> <span word="lower">lower</span> 4 . <span word="And">And</span> <span word="its">its</span> <span word="also">also</span> <span word="a">a</span> <span word="space">space</span> <span word="problem">problem</span>：<span word="photovoltaic">photovoltaic</span> <span word="cells">cells</span> <span word="can">can</span> <span word="take">take</span> <span word="up">up</span> <span word="all">all</span> <span word="the">the</span> <span word="space">space</span> <span word="on">on</span> <span word="the">the</span> <span word="roof">roof</span>, <span word="leaving">leaving</span> <span word="little">little</span> <span word="room">room</span>6 <span word="for">for</span> <span word="thermal">thermal</span> <span word="applications">applications</span>.</p><p> <span word="In">In</span> <span word="a">a</span> <span word="pair">pair</span> <span word="of">of</span> <span word="studies">studies</span>, <span word="Joshua">Joshua</span> <span word="Pearce">Pearce</span>, <span word="an">an</span> <span word="associate">associate</span> <span word="professor">professor</span> <span word="of">of</span> <span word="materials">materials</span> <span word="science">science</span> <span word="and">and</span> <span word="engineering">engineering</span>, <span word="has">has</span> <span word="devised">devised</span> <span word="a">a</span> 5 <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="a">a</span> <span word="better">better</span> <span word="PVT">PVT</span> <span word="made">made</span> <span word="with">with</span> <span word="a">a</span> <span word="different">different</span> <span word="kind">kind</span> <span word="of">of</span> <span word="silicon">silicon</span>. <span word="His">His</span> <span word="research">research</span> <span word="collaborators">collaborators</span> <span word="are">are</span> <span word="Kunal">Kunal</span> <span word="Girotra">Girotra</span> <span word="from">from</span> <span word="ThinSilicon">ThinSilicon</span> <span word="in">in</span> <span word="California">California</span> <span word="and">and</span> <span word="Michael">Michael</span> <span word="Pathak">Pathak</span> <span word="and">and</span> <span word="Stephen">Stephen</span> <span word="Harrison">Harrison</span> <span word="from">from</span> <span word="Queens">Queens</span> <span word="University">University</span>, <span word="Canada">Canada</span>.</p><p> <span word="Most">Most</span> <span word="solar">solar</span> <span word="panels">panels</span>7 <span word="are">are</span> <span word="made">made</span> <span word="with">with</span> <span word="crystalline">crystalline</span> <span word="silicon">silicon</span>, <span word="but">but</span> <span word="you">you</span> <span word="can">can</span> <span word="also">also</span> <span word="make">make</span> <span word="solar">solar</span> <span word="cells">cells</span> <span word="out">out</span> <span word="of">of</span> <span word="amorphous">amorphous</span> <span word="silicon">silicon</span>8, 6 <span word="known">known</span> <span word="as">as</span> <span word="thin">thin</span>-<span word="film">film</span> <span word="silicon">silicon</span>9. <span word="They">They</span> <span word="dont">dont</span> <span word="create">create</span> <span word="as">as</span> <span word="much">much</span> <span word="electricity">electricity</span>, <span word="but">but</span> <span word="they">they</span> <span word="are">are</span> <span word="lighter">lighter</span>, <span word="flexible">flexible</span>, <span word="and">and</span> <span word="cheaper">cheaper</span>. <span word="And">And</span>, <span word="because">because</span> <span word="they">they</span> 7 <span word="much">much</span> <span word="less">less</span> <span word="silicon">silicon</span>, <span word="they">they</span> <span word="have">have</span> <span word="a">a</span> <span word="greener">greener</span> <span word="footprint">footprint</span>. <span word="Unfortunately">Unfortunately</span>, <span word="thin">thin</span>-<span word="film">film</span> <span word="silicon">silicon</span> <span word="solar">solar</span> <span word="cells">cells</span> <span word="are">are</span> 8 <span word="to">to</span> <span word="some">some</span> <span word="bad">bad</span>-<span word="news">news</span> <span word="physics">physics</span> <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="the">the</span> <span word="Staebler">Staebler</span>-<span word="Wronski">Wronski</span> <span word="effect">effect</span>10.</p>
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