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

试卷相关题目

• 1Light pollution occurs when

  A.artificial lights illuminate the night sky.

  B.the moon lights up the night sky.

  C.too many stars are visible in the night sky

  D.streetlights are turned off.

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• 2On 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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• 3The half-life of C-14 is about 25，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4When an organism dies， the C-14 in it begins to decay.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Radiocarbon is reliable in dating an object back to at least 50，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 6How 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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• 7The 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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• 8Which 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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• 9When 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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• 10What does Akins do？

  A.She is a soldier.

  B.She is an accountant.

  C.She is a saleswoman

  D.She is a road sweeper.

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