What is the main idea of the passage？A．There is little danger of serious after－effects whe

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.

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