单项选择题

The author' s purpose in writing this article is to ______.

A．inform readers of Heller' s findings in his researches
B．persuade readers to get enough sleep at different ages
C．show readers the importance of getting enough sleep
D．tell readers how many hours of sleep they should get

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单项选择题

It can be inferred from the passage that ______.

A．people of an older age are more likely to suffer from deficient sleep
B．the older one becomes, the more sleep he or she will need every night
C．everyone of us needs to have seven or eight hours of sleep every night
D．even if we are tired, we can still react quickly as soon as we find dangers

单项选择题

Which of the following statements is NOT true according to the passage

A．Getting too little sleep is the commonest sleep trouble with most Americans who have sleep trouble.
B．At least twenty percent of Americans don' t have enough sleep every night.
C．Our brains will force us to sleep when we have piled up too large a sleep deficit
D．Seven or eight hours of sleep every night is enough for people of different ages.