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

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• 1What 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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• 2How does the author explain the function of the sleep homeostat、

  A.Through examples.

  B.With comparisons.

  C.Through cause and effect analysis.

  D.By presenting research findings.

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• 3What 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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• 4A 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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• 5Who 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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• 6The 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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• 7How 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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• 8According 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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• 9What can we conclude from the article、

  A.There are several contradictory emotions we tend to overlook.

  B.Females have more contradictory emotions than males do.

  C.The chemicals in the brain that activate emotions are easy to identify.

  D.Martinez’s next goal is to find an effective cure for people who suffer from PTSD.

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• 10Food waste in developing nations is mainly due to    .

  A.fast growing populations

  B.huge demand for high-quality foods

  C.poor technology in food industries

  D.people’s lack of concern about food shortages

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