gre考试阅读真题解析(B)
<p> <span word="An">An</span> <span word="experiment">experiment</span> <span word="conducted">conducted</span> <span word="aboard">aboard</span> <span word="Space">Space</span> <span word="Lab">Lab</span> <span word="in">in</span> 1983 <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="attempt">attempt</span> <span word="to">to</span> <span word="grow">grow</span> <span word="protein">protein</span> <span word="crystals">crystals</span> <span word="in">in</span> <span word="the">the</span> <span word="low">low</span>-<span word="gravity">gravity</span> <span word="environment">environment</span> <span word="of">of</span> <span word="space">space</span>. <span word="That">That</span> <span word="experiment">experiment</span> <span word="is">is</span> <span word="still">still</span> <span word="cited">cited</span> <span word="as">as</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="growing">growing</span> <span word="crystals">crystals</span> <span word="in">in</span> <span word="microgravity">microgravity</span> <span word="can">can</span> <span word="increase">increase</span> <span word="crystal">crystal</span> <span word="size">size</span>: <span word="the">the</span> <span word="authors">authors</span> <span word="reported">reported</span> <span word="that">that</span> <span word="they">they</span> <span word="grew">grew</span> <span word="lysozyme">lysozyme</span> <span word="protein">protein</span> <span word="crystals">crystals</span> 1,000 <span word="times">times</span> <span word="larger">larger</span> <span word="than">than</span> <span word="crystals">crystals</span> <span word="grown">grown</span> <span word="in">in</span> <span word="the">the</span> <span word="same">same</span> <span word="device">device</span> <span word="on">on</span> <span word="Earth">Earth</span>. <span word="Unfortunately">Unfortunately</span>, <span word="the">the</span> <span word="authors">authors</span> <span word="did">did</span> <span word="not">not</span> <span word="point">point</span> <span word="out">out</span> <span word="that">that</span> <span word="their">their</span> <span word="crystals">crystals</span> <span word="were">were</span> <span word="no">no</span> <span word="larger">larger</span> <span word="than">than</span> <span word="the">the</span> <span word="average">average</span> <span word="crystal">crystal</span> <span word="grown">grown</span> <span word="using">using</span> <span word="other">other</span>, <span word="more">more</span> <span word="standard">standard</span> <span word="techniques">techniques</span> <span word="in">in</span> <span word="an">an</span> <span word="Earth">Earth</span> <span word="laboratory">laboratory</span>.</p><p> <span word="No">No</span> <span word="research">research</span> <span word="has">has</span> <span word="yet">yet</span> <span word="produced">produced</span> <span word="results">results</span> <span word="that">that</span> <span word="could">could</span> <span word="justify">justify</span> <span word="the">the</span> <span word="enormous">enormous</span> <span word="costs">costs</span> <span word="of">of</span> <span word="producing">producing</span> <span word="crystals">crystals</span> <span word="on">on</span> <span word="a">a</span> <span word="large">large</span> <span word="scale">scale</span> <span word="in">in</span> <span word="space">space</span>. <span word="To">To</span> <span word="get">get</span> <span word="an">an</span> <span word="unbiased">unbiased</span> <span word="view">view</span> <span word="of">of</span> <span word="the">the</span> <span word="usefulness">usefulness</span> <span word="of">of</span> <span word="microgravity">microgravity</span> <span word="crystal">crystal</span> <span word="growth">growth</span>, <span word="crystals">crystals</span> <span word="grown">grown</span> <span word="in">in</span> <span word="space">space</span> <span word="must">must</span> <span word="be">be</span> <span word="compared">compared</span> <span word="with">with</span> <span word="the">the</span> <span word="best">best</span> <span word="crystals">crystals</span> <span word="that">that</span> <span word="have">have</span> <span word="been">been</span> <span word="grown">grown</span> <span word="with">with</span> <span word="standard">standard</span> <span word="techniques">techniques</span> <span word="on">on</span> <span word="Earth">Earth</span>. <span word="Given">Given</span> <span word="the">the</span> <span word="great">great</span> <span word="expense">expense</span> <span word="of">of</span> <span word="conducting">conducting</span> <span word="such">such</span> <span word="experiments">experiments</span> <span word="with">with</span> <span word="proper">proper</span> <span word="controls">controls</span>, <span word="and">and</span> <span word="the">the</span> <span word="limited">limited</span> <span word="promise">promise</span> <span word="of">of</span> <span word="experiments">experiments</span> <span word="performed">performed</span> <span word="thus">thus</span> <span word="far">far</span>, <span word="it">it</span> <span word="is">is</span> <span word="questionable">questionable</span> <span word="whether">whether</span> <span word="further">further</span> <span word="experiments">experiments</span> <span word="in">in</span> <span word="this">this</span> <span word="area">area</span> <span word="should">should</span> <span word="even">even</span> <span word="be">be</span> <span word="conducted">conducted</span>.</p><p> 17. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="passage">passage</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="is">is</span> <span word="true">true</span> <span word="about">about</span> <span word="the">the</span> <span word="Space">Space</span> <span word="Lab">Lab</span> <span word="experiment">experiment</span> <span word="conducted">conducted</span> <span word="in">in</span> 1983?</p><p> <span word="It">It</span> <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="experiment">experiment</span> <span word="to">to</span> <span word="take">take</span> <span word="place">place</span> <span word="in">in</span> <span word="the">the</span> <span word="microgravity">microgravity</span> <span word="environment">environment</span> <span word="of">of</span> <span word="space">space</span>.</p><p> <span word="It">It</span> <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="experiment">experiment</span> <span word="in">in</span> <span word="which">which</span> <span word="researchers">researchers</span> <span word="in">in</span> <span word="space">space</span> <span word="were">were</span> <span word="able">able</span> <span word="to">to</span> <span word="grow">grow</span> <span word="lysozyme">lysozyme</span> <span word="protein">protein</span> <span word="crystals">crystals</span> <span word="greater">greater</span> <span word="in">in</span> <span word="size">size</span> <span word="than">than</span> <span word="those">those</span> <span word="grown">grown</span> <span word="on">on</span> <span word="Earth">Earth</span>.</p>
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