A rocket can fly to the moon because__________

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• 1When 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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• 2What 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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• 3What 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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• 4What is NOT true of Project BudBurst、

  A.Only experts can participate in it．

  B.Everybody can participate in it．

  C.It collects life cycle data on a variety of common plants．

  D.It has its own website．

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• 5In"All that，s needed to become one…(paragraph2)"，what does the word"one"stands for、

  A.a citizen journalist

  B.a citizen scientist

  C.a scientist

  D.a citizen

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• 6Which 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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• 7A rocket is pushed up into the air when__________

  A.hot gas rushes out of its head．

  B.it is powered by gas．

  C.hot gas rushes out of its bottom．

  D.hot gas rushes out of its neck．

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