职称英语理工类阅读理解经典练习(2)
<p> <span word="A">A</span> <span word="little">little</span> <span word="airplane">airplane</span> <span word="has">has</span> <span word="given">given</span> <span word="new">new</span> <span word="meaning">meaning</span> <span word="to">to</span> <span word="the">the</span> <span word="term">term</span> <span word="going">going</span> <span word="hyper">hyper</span>. <span word="The">The</span> <span word="Hyper">Hyper</span>-<span word="X">X</span> <span word="is">is</span> <span word="an">an</span> <span word="unmanned">unmanned</span>，<span word="experimental">experimental</span> <span word="aircraft">aircraft</span> <span word="just">just</span> 12 <span word="feet">feet</span> <span word="long">long</span>. <span word="It">It</span> <span word="achieves">achieves</span> <span word="hypersonic">hypersonic</span> <span word="speed">speed</span> <span word="using">using</span> <span word="a">a</span> <span word="special">special</span> <span word="sort">sort</span> <span word="of">of</span> <span word="engine">engine</span> <span word="known">known</span> <span word="as">as</span> <span word="a">a</span> <span word="scramjet">scramjet</span>3.<span word="It">It</span> <span word="may">may</span> <span word="sound">sound</span> <span word="like">like</span> <span word="something">something</span> <span word="from">from</span> <span word="a">a</span> <span word="comic">comic</span> <span word="book">book</span>，<span word="but">but</span> <span word="engineers">engineers</span> <span word="have">have</span> <span word="been">been</span> <span word="experimenting">experimenting</span> <span word="with">with</span> <span word="scramjets">scramjets</span> <span word="since">since</span> <span word="the">the</span> 1960<span word="s">s</span>. <span word="Out">Out</span> <span word="of">of</span> <span word="the">the</span> <span word="three">three</span> <span word="experimental">experimental</span> <span word="Hyper">Hyper</span>-<span word="X">X</span> <span word="aircrafts">aircrafts</span> <span word="built">built</span> <span word="for">for</span> <span word="NASA">NASA</span>5，<span word="only">only</span> <span word="one">one</span> <span word="is">is</span> <span word="now">now</span> <span word="left">left</span>.<span word="The">The</span> <span word="agency">agency</span> <span word="has">has</span> <span word="plans">plans</span> <span word="for">for</span> <span word="another">another</span> 11-<span word="second">second</span> <span word="hypersonic">hypersonic</span> <span word="flight">flight</span>，<span word="this">this</span> <span word="time">time</span> <span word="at">at</span> 10 <span word="times">times</span> <span word="the">the</span> <span word="speed">speed</span> <span word="of">of</span> <span word="the">the</span> <span word="sound">sound</span>. 1. <span word="The">The</span> <span word="Hyper">Hyper</span>-<span word="X">X</span> <span word="broke">broke</span> <span word="the">the</span> <span word="record">record</span> <span word="because">because</span> <span word="B">B</span> <span word="it">it</span> <span word="flew">flew</span> <span word="along">along</span> <span word="the">the</span> <span word="equator">equator</span>. <span word="D">D</span> <span word="it">it</span> <span word="traveled">traveled</span> <span word="at">at</span> <span word="a">a</span> <span word="supersonic">supersonic</span> <span word="speed">speed</span>.</p><p> </p>
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