A rocket is pushed up into the air when__________

试卷相关题目

• 1Which of the following statements about a rocket is NOT true、

  A.It can fly when there is no air．

  B.It can fly without wings．

  C.It is made of strong metal．

  D.It is propelled by burning gas inside it．

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• 2A rocket can fly to the moon because__________

  A.it looks like a balloon．

  B.it is much lighter than an airplane．

  C.it doesn't have wings．

  D.it works like an untied balloon．

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• 3When an airplane flies too high，___________.

  A.the air will be too thin to support its wings．

  B.the air will become thicker．

  C.the air will exert pressure on it．

  D.the air will disappear in no time．

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• 4What color is the sky、

  A.It iS blue．

  B.It iS white．

  C.It is grey．

  D.It has no color．

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• 5What is the final purpose of Project BudBurst、

  A.To study when plants will have their first buds．

  B.To find out the types of plants in the neighborhood．

  C.To collect life cycle data on a variety of common plants from across the United States．

  D.To investigate how plants and animals will respond as the climate changes．

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