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 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

单项选择题

It can be concluded from the passage that newspaper readers______.

A．apply reading techniques skillfully
B．jump from one newspaper to another
C．appreciate the variety of a newspaper
D．usually read a newspaper selectively