The word "springs" in Paragraph 3 means

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• 1What is the most important feature of the backpack invented by Lawrence C. Rome and his colleagues、

  A.It produces electricity for electronic devisees while the wearer walks.

  B.It can be used as cell phones, GPS in the military actions or field studies.

  C.It is small and convenient.

  D.It is light and easy to carry.

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• 2Backpacks are convenient because

  A.they can be very large.

  B.they can hold as many things as you want to carry.

  C.your hands are freed to do other things.

  D.you do not have to carry things with you.

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• 3Which of the following is closest in meaning to the title "Light Night, Dark Stars" 、

  A.The night sky is light colored and stars are black.

  B.Lights appear at night and stars are seen in the dark.

  C.City lights illuminate the night sky and make stars invisible.

  D.City lights at night illuminate stars in the sky.

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• 4How does light pollution affect wildlife.9 Which of the following is NOT correct、

  A.Animals may go off course due to the attraction of artificial lights.

  B.Animals might be attracted by artificial lights to go into cities.

  C.Artificial lights at night may make migrating birds lose their way.

  D.Attracted by artificial lights, birds fly into lighted buildings.

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• 5Does the writer think growing cities affect astronomers' work、 Why does he think so、

  A.Yes. Because the once dark rural areas are polluted by lights.

  B.No. Because they can still see stars in rural areas.

  C.Yes. Because rural areas are not a good place for astronomers to study stars.

  D.No. Because faint light given off by stars can still be seen on a clear night.

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• 6According to Paragraph 4, what does Rome plan to do、

  A.To make the backpack more comfortable for the wearer.

  B.To put the backpack on the market.

  C.To test the advantage of the backpack.

  D.To promote the backpack in a newspaper or on television.

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• 7What is implied in "if you do gut one eventually, just make sure to look both ways beforecrossing the street!"、

  A.You will Be too excited to watch the traffic.

  B.Enjoying electronic devices while walking may invite traffic accidents.

  C.B.Enjoying electronic devices while walking may invite traffic accidents.C.It is not possible for you to get such a backpaek.

  D.It is wise of you to have such a backpack

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