Light pollution occurs when

试卷相关题目

• 1On a clear night， people can see

  A.150 stars.

  B.hundreds of stars.

  C.one thousand stars.

  D.more than 14，000 stars.

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• 2The half-life of C-14 is about 25，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3When an organism dies， the C-14 in it begins to decay.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Radiocarbon is reliable in dating an object back to at least 50，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Radar is used to determine the characteristics of radiocarbon.

  A.Right

  B.Wrong

  C.Not mentioned

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• 6Nowadays even suburbs are becoming unsuitable for scientists to do their jobs because

  A.the night sky there is too dark.

  B.the once dark areas are also polluted by lights.

  C.these areas are not polluted by chemicals.

  D.these areas are less developed.

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• 7How does light pollution affect wildlife？

  A.Animals may go off course.

  B.It helps migrating birds find their homes.

  C.Animals are afraid to go out after sunset.

  D.It helps birds fall asleep.

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• 8The title “Light Night， Dark Stars” means

  A.the night sky is brightly lit up and stars are black.

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

  C.city lights at night illuminate stars in the sky.

  D.city lights illuminate the night sky， making stars invisible

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• 9Which statement about Barth is NOT true？

  A.He is 33 years old now.

  B.He works at a Goodwill thrift shop.

  C.He works at a Salvation Army thrift shop.

  D.He was a college student many years ago

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• 10When Barth was a college student， he often shopped at thrift shops

  A.to save money.

  B.to save energy.

  C.to help the environment.

  D.to make friends with poor peopl

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