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发布时间: 1970-01-01

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1最佳选择题 3分

FlyingtheHypertSkiesAlittleairplanehasgivennewmean

  • A. it was the first air-breathing jet plane.
  • B. it flew along the equator.
  • C. it flew at speeds smaller than five times the speed of sound.
  • D. it traveled at a supersonic speed.
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正确答案: -

本题解析: 暂无解析

2最佳选择题 3分

FlyingtheHypertSkiesAlittleairplanehasgivennewmean

  • A. A jet engine that gets oxygen from the air.
  • B. A scramjet engine that doesn’t carry its own oxygen supply.
  • C. A rocket engine that carries its own supply of oxygen.
  • D. A jet engine that uses no oxygen.
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正确答案: -

本题解析: 暂无解析

3最佳选择题 3分

FlyingtheHypertSkiesAlittleairplanehasgivennewmean

  • 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 doesn’t carry its own oxygen supply.
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正确答案: -

本题解析: 暂无解析

4最佳选择题 3分

FlyingtheHypertSkiesAlittleairplanehasgivennewmean

  • 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.
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正确答案: -

本题解析: 暂无解析

5最佳选择题 3分

FlyingtheHypertSkiesAlittleairplanehasgivennewmean

  • 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.
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正确答案: -

本题解析: 暂无解析

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