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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单项选择题

What is the main idea of the passage

A．There is little danger of serious after-effects when human beings are deprived of sleep for long periods of time.
B．Going without sleep for a long period will cause bad shortlivede ffects, but apparently no serious after-effects.
C．After 200 hours without sleep Tripp was suffering from "mental ill ness".
D．The doctors predicted Tripp would sleep for twenty or thirty hours.

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