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

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单项选择题

The second sentence of the last paragraph tells us that it is______.

A．preferable to have a sound sleep before a night shift
B．good practice to eat something light before we go to bed
C．essential to make up for cost sleep
D．natural to take a nap whenever we Teel the need for it

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