What happens when human beings are not allowed to sleep for long periods of time? To answer this question, a New Yorker, Peter Tripp, offered to stay awake 200 hours. During that time Tripp was observed by a group of doctors, who reported on his progress.

       After three days of staying awake, he began to show signs of his mental breakdown. He laughed at things that were not funny, and wept（哭泣） at things that were not sad. Complaining of pressure caused by a hat on his head, he tried repeatedly to take it off. Tripp, of course, was not wearing a hat.

On the fifth day he cried out that a doctor's jacket looked like crawling worms. Then he imagined he was in another city; he tried to run away from the building, insisting it was on fire; and he thought the 200-hour mark had been passed but that the doctors were still trying to keep the experiment going. After 200 hours without sleep, Tripp, said the doctors, was “suffering from mental illness.” He was nearly mad.

Hardly able to stand, Tripp was helped across the street to a room in a hotel. There, after being awake for 201 hours and thirteen minutes, he fell asleep. The doctors predicted（预言） he would sleep for twenty or thirty hours.  “Peter Tripp will sleep the deepest sleep in history”, said the doctors. Tripp slept all right----for nine hours and eleven minutes. When he awoke, his first words were: “I feel fine.” After a medical check, his greatly surprised watchers said that he was sound and well.

1．The best title for this passage is _______.

  A．Sleeplessness                  

  B．Danger to Health

  C．Test of Strength to Health of Body and Mind

  D．A Man Who Didn't Sleep for Over 200 Hours

2．What is the main idea of the passage?                                     

A．There is little danger when human beings are not allowed to sleep for long periods of time.

  B．Going without sleep for a long period will cause bad effects.

C．After 200 hours without sleep Tripp was suffering from “mental illness”.

D．The doctors predicted Tripp would sleep for twenty or thirty hours.

3．Tripp started to show signs of his mental breakdown ______.              

A．when his third day of staying awake came to an end

B．when he was not allowed to sleep for 5 days

C．at the end of the experiment

D．after 201 hours and 13 minutes without sleep

4．The doctors were greatly surprised because Tripp ______.    

    A．could not fall asleep                       B．slept the deepest in history

    C．slept for thirty hours                      D．slept for a relatively short time

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

    A．may produce lasting harm to the brain                                

    B．may produce a loss of cheerfulness forever

    C．may not produce lasting damage      

       D．may produce some serious after-effects