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.

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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.