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

试卷相关题目

• 1A prairie is a type of ________.

  A.plants

  B.animals

  C.grassland

  D.soil

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• 2What 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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• 3Which of the following is low-intensity activities、

  A.swimming

  B.jumping rope

  C.weightlifting

  D.climbing stairs

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• 4A good exercise program should involve ________ types of activities.

  A.two

  B.three

  C.four

  D.five

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• 5We can learn from the passage that ________.

  A.exercise can prevent all kinds of diseases

  B.a good exercise program should be exciting

  C.exercise can help you control your weight

  D.it’ s not necessary to make an exercise program

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• 6By 1889, the bison population was ________.

  A.about 30 million

  B.fewer than a thousand

  C.about 60 million

  D.several hundred thousand

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• 7We 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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