单项选择题

Many Americans believe that ______.

A．sleep is the first thing that can be sacrificed when one is busy
B．they need more sleep to cope with the complexities of everyday life
C．to sleep is something one can do at any time of the day
D．enough sleep promotes people's drive and ambition

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单项选择题

Which of the following statements is TRUE, according to the passage

A．An authentic biography seldom appeals to its readers.
B．An authentic biography is one authorized by the subject.
C．No one can write a perfect biography.
D．Authorized biographies have a wider readership.

单项选择题

The word subjects (first sentence, last paragraph) refers to ______.

A．the performance tests used in the study of sleep deficit
B．special branches of knowledge that are being studied
C．people whose behaviors or reactions are being studied
D．the psychological consequences of sleep deficit