By 1889, the bison population was ________.

试卷相关题目

• 1What is the meaning of “interdependent ecosystem” in the first line、

  A.All things in a prairie region depend on one another.

  B.Animals live on plants in a prairie region.

  C.Fire plays an important role in a prairie region.

  D.Soil has a close relationship with a praide region.

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• 2A prairie is a type of ________.

  A.plants

  B.animals

  C.grassland

  D.soil

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• 3What does the writer mainly tell us？

  A.Exercise is important and should be part of your daily life.

  B.A good exercise program can help you a lot to keep healthy.

  C.Exercise can improve your strength and blood circulation.

  D.Start to make an exercise program when you are out of shap

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• 4Which of the following is low-intensity activities、

  A.swimming

  B.jumping rope

  C.weightlifting

  D.climbing stairs

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• 5A good exercise program should involve ________ types of activities.

  A.two

  B.three

  C.four

  D.five

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• 6We can learn from the article that ________.

  A.fires may destroy a prairie and therefore must be prevented

  B.the interdependent ecosystem is both below and above ground

  C.the prairie ecosystem is in danger because of farming and building

  D.people haven’ t realized that they are losing their natural prairie

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