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

试卷相关题目

• 1What kind of engine did the Hyper-X use、

  A.jet engine that carries its own oxygen supply．

  B.jet engine that uses no oxygen．

  C.scramjet engine that doesn't carry its own oxygen supply．

  D.rocket engine that carries its own oxygen supply.

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• 2The 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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• 3Generally we remember only a few facts about the past.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Long—term memory is more important than short-term memory.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Animals do not have a long-term memory

  A.Right

  B.Wrong

  C.Not mentioned

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• 6What 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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• 7What 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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• 8Parents 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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• 9Why 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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• 10What happened in the 1970s、

  A.The US government called on its people to reduce their weight．

  B.Health experts persuaded restaurants to serve smaller portions．

  C.The United States produced more grain than needed．

  D.The American waistline started to expand．

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