单项选择题

From the passage we can draw the conclusion that long periods of sleeplessness may produce ______.

A．lasting harm to the brain
B．a loss of cheerfulness forever
C．no permanent damage
D．some serious after-effects
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单项选择题
After 72 hours without sleep, Tripp ______.
A．showed mental disorder
B．saw imaginary worms
C．was unable to stand
D．tried to run away from the building
单项选择题
Tripp imagined all kinds of things ______.
A．when his third day of staying awake came to an end
B．when he was deprived of sleep for 5 days
C．at the end of the experiment
D．after 201 hours and thirteen minutes without sleep
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