2015年职称英语考试综合类A级阅读理解题(3)_职称英语阅读理解

　　A It goes slower than a rocket.

　　B It extracts oxygen from the air that flows through the engine.

　　C It works only at speeds greater than five times the speed of sound.

　　D It doesnt carry its own oxygen supply.、

　　4. What did Werner J.A.Dahm of the University of Michigan say about the Hyper-X test flight?

　　A It indicated the birth of a very fast airplane.

　　B It was self-powered，so it lasted only 11 seconds.

　　C It can transportcargo quickly and cheaply to the brink of space.

　　D It is a major milestone in the journey of making a new type of very fast airplanes,

　　5. What has NASA planned to do?

　　A To make another 11-second hypersonic flight at 10 times the speed of the sound.

　　B To make three more Hyper-X experiments.

　　C To retest the aircraft that is left.

　　D To make the aircraft fly higher and longer.

　　答案与题解：

　　1. 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。

　　2. B 第四段讲了三种发动机的氧气喷气式发动机是从空气中汲取氧气，火箭发动机必须自携氧气，而超音速冲压喷气发动机则不必白携氧气，而这正是Hyper-X使用的发动机装置。

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