How does the author explain the function of the sleep homeostat、

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• 1What is the article mainly about、

  A.A new way to treat sleep disorders.

  B.The discovery of the sleep “homeostat”

  C.Advice on what to do when you fail to fall asleep.

  D.A comparison of the two mechanisms that regulate sleep.

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• 2A child who wants to learn about how whales communicate will buy    .

  A.Big Blue Whale

  B.Life in the Coral Reef

  C.North American Endangered Species

  D.Whale

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• 3Who has won an award as an illustrator or a photographer、

  A.Nick Maland.

  B.Tom Stack.

  C.Jan Sovak.

  D.Frank Greenaway.

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• 4What is special about North American Endangered Species、

  A.It uses examples from the child’s world.

  B.The author introduces animals with poems.

  C.It contains bright colors.

  D.It takes a close look at sea animals.

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• 5What do we learn from Big Blue Whale、

  A.The number of the blue whale is increasing.

  B.Many animals are in danger of dying out.

  C.There used to be more than 10,000 blue whales.

  D.The blue whale has strong survival abilities.

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• 6What can we conclude from the article、

  A.Generally, the sleep homeostat has less effect on people during the day than at night.

  B.There is little scientists can do to affect the way the sleep homeostat works.

  C.What makes us go to sleep at night is probably a combination of the two mechanisms.

  D.The more homeostat neurons there are in one’s brain, the more easily one can fall asleep.

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• 7The underlined word “unravel” in the last paragraph is closest in meaning to      .

  A.put up with

  B.figure out

  C.keep track of

  D.take notice of

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• 8The underlined part “t his is just the tip of the iceberg” in Paragraph 3 probably means      .

  A.this is a truth known to us all

  B.this is the total amount of something

  C.this is easily seen or discovered

  D.this is only the smallest and most obvious part of something

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• 9How does the author explain the definition of “compound emotions” in the article、

  A.With comparisons.

  B.Through examples.

  C.Through cause and effect analysis.

  D.By presenting research findings.

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• 10According to the article, people are likely to become happily disgusted when      .

  A.they receive unexpected good news

  B.someone they don’t care about makes them happy

  C.something unpleasant but also funny happens

  D.they successfully escape from a dangerous situation

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