It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's what all doctors thought, until they heard about Al Herpin.

　　Al Herpin, it was said, never slept. He was 90 years old when doctors came to his home in New Jersey. They expected to find out that he needed sleep of some kind. But they were surprised. Though they watched him every hour of the day, they never saw Herpin sleeping. He did not even own a bed. He never needed one.

　　The closest that Herpin came to resting was to sit in a rocking chair(摇椅) and read some news papers. The doctors were puzzled by this strange continuous sleeplessness. Herpin offered the only probable explanation of his condition. He remembered some talk about his mother having been injured several days before he was born.

The point of this story is that _______.

　A. We needn't feel surprised to find someone who doesn't sleep

　B. one person was found who actually didn't need any sleep

C. everyone needs some rest to stay alive

　D. not sleeping may help one to live longer

After watching him closely, the doctors believed that Al Herpin _______.

　A. needed some kind of sleep   　B. slept while one was watching

　C. needed no sleep at all  　　　D. nearly slept in a rocking chair

One suggested explanation of Herpin's sleeplessness was _______.

　A. his old age  　　　

B. his not having a bed

　C. his magnificent physical condition

　D. his mother's injury while carrying him

The writer of the story obviously thinks that Al Herpin's sleeplessness ___.

　A. could be cured  　　　B. could be explained

　C. was healthful   　　　D. was uncommon　　

---Did you visit the famous museum ?

　 ---No. We ______ it. But we spent too much time shopping.

　　A. can't have visited 　　　　　 B. could have visited

　　C. must have visited 　　　　　 D. shouldn't have visited

The chances of discovering life on Neptune are about a million _____.

　　A. at one    B. for one    C. to one    D. against one

_____ his homework, he went out to play.

　　A. Having done 　　　　　　　　　　　　　B. Done

　　C. He has done 　　　　　　　　　　　　　D. He had done

We have eight foreign teachers in our school,five of _______ are young ladies.

A. them　　 B. whom

C. who    D. which