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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单项选择题

The purpose of this article is to______.

A．ware 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

It is commonly accepted in American society that too much sleep is______.

A．unreasonable
B．criminal
C．harmful
D．costly