单项选择题

The "American sleep debt" ( Line 1, Para. 3) is the result of ______.

A．the traditional misconception the Americans have about sleep
B．the new sleep policy of the Clinton Administration
C．the rapid development of American industry
D．the Americans’ worry about the danger of sleepiness
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单项选择题
The purpose of this article is to ______.
A．warn us of the wickedness of napping
B．explain the danger of sleepiness
C．discuss the side effects of napping
D．convince the reader of the necessity of napping
单项选择题
The research done by the Dement commission shows that Americans ______.
A．don’t like to take naps
B．are terribly worried about their national debt
C．sleep less than is good for them
D．have caused many industrial and traffic accidents
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