职称英语理工类阅读理解经典练习(2)-查字典英语网
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职称英语理工类阅读理解经典练习(2)

发布时间:2016-03-01  编辑:查字典英语网小编

  A little airplane has given new meaning to the term going hyper.   The Hyper-X is an unmanned,experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet3.It may sound like something from a comic book,but engineers have been experimenting with scramjets since the 1960s.   Out of the three experimental Hyper-X aircrafts built for NASA5,only one is now left.The agency has plans for another 11-second hypersonic flight,this time at 10 times the speed of the sound.   1. The Hyper-X broke the record because   B it flew along the equator.   D it traveled at a supersonic speed.

  

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