Careful observations and systematic studies of sunspots

试卷相关题目

• 1Which 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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• 2What 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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• 3What 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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• 4Why do American restaurants serve large portions、

  A.Because Americans associate quantity with value．

  B.Because Americans have big bellies．

  C.Because Americans are good eaters．

  D.Because Americans are too weak．

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• 5Parents in the United States tend to ask their children

  A.to save food for tomorrow．

  B.to wash the dishes．

  C.not to waste food．

  D.not to eat too much．

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• 6Sunspots 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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• 7The leading spot and the following spot are the names of

  A.two large sunspots.

  B.a large spot and a small spot.

  C.the two spots in a spot pair.

  D.the central core and the ring around it.

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• 8If 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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• 9In the last paragraph the word "persistent" means

  A.important

  B.effective.

  C.enduring.

  D.visibl

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