Flying the Hypert1 Skies
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.
The Hyper-X broke the record because
B it flew along the equator.
D it traveled at a supersonic speed.
A A jet engine that gets oxygen from the air.
C A rocket engine that carries its own supply of oxygen.
What is NOT true about the scramjet engine?
B It extracts oxygen from the air that flows through the engine.
D It doesnt carry its own oxygen supply.
A It indicated the birth of a very fast airplane.
C It can transportcargo quickly and cheaply to the brink of space.
What has NASA planned to do?
B To make three more Hyper-X experiments.
D To make the aircraft fly higher and longer.
C Hyper-X之所以打破纪录是因为它的飞行速度是音速的7倍。它不是第一架空气喷气式飞机,也不是第一架超音速飞机,所以A和D都不对。Hyper-X的试飞并未绕赤道飞行,所以B也是错误的选择。
A 根据第五段内容,B、C、D都是正确的说法。第四段最后一句告诉我们,A的说法是不正确的。
A 答案可在最后一段找到。
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初中英语关系代词who与that的用法
小升初语法必备:指示代词this和that的用法
初中英语语法:物主代词的用法
物主代词专项练习
小升初语法必备:相互代词的用法小结
反身代词的练习题
高考英语语法必备:关系代词as的用法
英语中定冠词the 的用法
小学英语语法相互代词的用法
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英语语法必备:物主代词用法归纳
初中英语代词练习题
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初中英语语法 冠词的用法小结
英语语法中最高级的变法
小升初英语中定冠词的用法
初中英语语法:反身代词用法小结
小升初英语形容词比较级的用法及练习
小学英语语法:反身代词
小升初英语 物主代词的用法
英语中冠词用法练习及答案
英语中相互代词用法注意事项
初中英语语法必备:关系代词who与whom的用法区别
初中英语语法:关系代词that的用法
初中英语双重所有格
英语语法:形容词最高级的用法小结
小学英语语法 指示代词的用法
英语中关系代词which who that 的用法
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