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.

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单项选择题

What does the word subjects (Line 1, Para. 4) mean

A．Person or thing that is being discussed or described.
B．Branch of knowledge studied in a school.
C．Person or thing being treated in a certain way or being experimented on.
D．Any member of a State apart from the supreme ruler.

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