单项选择题

The major cause of sleep-deficit of modem people is ______.

A．the endless TV programme in the evenings
B．heavy work load of the day
C．sufficient energy modem people usually have
D．loud noises in the modem cities

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单项选择题

Which of the following is Dr. David's opinion

A．People who think they are sleeping enough are better off than those who don't.
B．Some people can remain vigorous with only 6.5 hours' sleep a night.
C．If they get 8.5 hours' sleep, people will be full of drive and ambition.
D．People's mental power suffers if they are in sleep deficit.

单项选择题

What is the main topic of the passage

A．Research on the consequences of sleep-deficit.
B．The epidemic of sleepiness in the modem times.
C．The history of people's sleeping patterns.
D．The minimum of our sleeping hours.