The major cause of sleep-deficit of modern people is ________.

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• 1People in the 18th and 19th centuries slept about 9.5 hours a night because ________.

  A.they were forced by their parents to do so

  B.they knew what was best for their health

  C.they had no electricity

  D.they were not so dynamic and ambitious as modern people are

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• 2Which of the following is Dr David’s opinion、

  A.People who think they are sleeping enough are better off than those who don’t.

  B.Some people can remain energetic with only 6.5 hours’ sleep a night.

  C.If they get 8.5 hours’ sleep，people will be full of drive and ambition.

  D.People’s mental power suffers if they are lacking in sleep.

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• 3What is the main topic of the passage、

  A.Research on the causes and consequences of sleep-deficit.

  B.The epidemic of sleepiness in the modern times.

  C.The history of people’s sleeping patterns.

  D.The minimum of our sleeping hours.

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• 4What does the word “subjects” in Paragraph 4 mean、

  A.Persons or things being discussed or described.

  B.Branches of knowledge studied in a school.

  C.Persons or things being treated in a certain way or being experimented on.

  D.Any member of a state apart from the supreme ruler.

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