What kind of engine did the Hyper-X use、

试卷相关题目

• 1The Hyper-X broke the record because

  A.it was the first air-breathing jet plane．

  B.it flew along the equator．

  C.it traveled at the speed of sound．

  D.it reached a speed of about 5, 000 miles per hour，

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• 2Generally we remember only a few facts about the past.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3Long—term memory is more important than short-term memory.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Animals do not have a long-term memory

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Emotional memory is used when we perform physical movements

  A.Right

  B.Wrong

  C.Not mentioned

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• 6Which of the following is NOT true of the scramjet engine、

  A.It has been used on passenger planes．

  B.The air it breathes does not put out the combustion flames．

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

  D.It goes as fast as a rocket．

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• 7What does Werner J．A．Dahm say about the Hyper-X test flight、

  A.It was unsuccessful because it lasted only 11 seconds．

  B.It is a very important event in developing very fast airplanes．

  C.It allows people to fly at an altitude of 100,000 feet．

  D.It can transport cargo quickly and cheaply to outer space．

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• 8What does NASA plan to do、

  A.To build one more Hyper-X aircraft．

  B.To carry out three more Hyper-X experiments．

  C.To make the aircraft fly higher and longer．

  D.To test another hypersonic flight at 10 times the speed of sound．

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• 9Parents in the United States tend to ask their children

  A.to save food for tomorrow．

  B.to wash the dishes．

  C.not to waste food．

  D.not to eat too much．

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• 10Why do American restaurants serve large portions、

  A.Because Americans associate quantity with value．

  B.Because Americans have big bellies．

  C.Because Americans are good eaters．

  D.Because Americans are too weak．

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