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

试卷相关题目

• 1Careful 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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• 2Generally we remember only a few facts about the past．

  A.Right

  B.Wrong

  C.Not mentioned

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• 3Long—term memory is more important than short-term memory．

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Animals do not have a long、term memory．

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Emotional memory is used when we perform physical movements．

  A.Right

  B.Wrong

  C.Not mentioned

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• 6The 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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• 7Infiniteness 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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• 8In the last paragraph the word "persistent means

  A.important.

  B.effective.

  C.enduring.

  D.visibl

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• 9What is the mystery that researchers find hard to explain、

  A.Honeybees are flying all across the country.

  B.Half of the honeybees in the US have died.

  C.Honeybees are leaving their hives and do not return.

  D.Honeybee hives are in disorder.

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• 10Researchers are seriously concerned with the phenomenon of colony—collapse disorder because

  A.honeybees help produce one-third of the foods we eat

  B.parasites on bees may spread everywhere.

  C.honeybees cannot find enough food elsewhere.

  D.honeybees feed on flowers.

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