The leading spot and the following spot are the names of

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• 1Sunspots are cooler than the rest of the sun's surface because

  A.they produce less energy.

  B.they are buried in the sun.

  C.they are far away from magnetic fields.

  D.they are close to magnetic fields.

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• 2Careful observations and systematic studies of sunspots

  A.were made by ancient astronomers.

  B.started in the early 17th century.

  C.were made by Galileo only.

  D.could be made without a telescop

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• 3Which of the following is NOT true of working class Americans、

  A.They work long hours．

  B.They live from paycheck to paycheck．

  C.They don't want to be healthy eaters．

  D.They want to save money for presents．

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• 4What does the survey indicate、

  A.Many low-income Americans want large portions．

  B.Twenty percent of Americans want smaller portions．

  C.Fifty-seven percent of Americans want large portions．

  D.Forty-five percent of Americans want smaller portions．

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• 5What happened in the 1970s、

  A.The US government called on its people to reduce their weight．

  B.Health experts persuaded restaurants to serve smaller portions．

  C.The United States produced more grain than needed．

  D.The American waistline started to expand．

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• 6If an intense sunspot activity-had occurred in 1857, the next one would have been in

  A.1858.

  B.1862.

  C.1865.

  D.1868.

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• 7In the last paragraph the word "persistent" means

  A.important

  B.effective.

  C.enduring.

  D.visibl

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