( C )

Sleeping Problem

How much sleep do we need? We are all different. Some people need only three hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average(平均值)of seven to eight hours a night. After the age of fifty, the average sleep time goes down to 6.5 hours a night.

Most people have a night off when they cannot sleep. About one in three Americans has a problem with sleep. Many of these people cannot fall sleep. This problem is called insomnia.

This is not a new problem. Many famous people in history have insomnia. Some of these people had special ideas to make them sleep. Benjamin Franklin, the famous statement(政治家)and inventor, had four beds. The King Louis XIV of France had 413 beds and hoped he could fall asleep in one of them. Mark Twain, the famous American writer, had a different way. He lay on his side across the end of the bed!

46. Most people need ________hours of sleep a night.

A. 3          B. 10       C. 7-8         D. 5-6

47. People need ________sleep as they got older.

A. more       B. less      C. no          D. little

48. The name of this problem is insomnia. Here insomnia means____

A. going to sleep easily         B. sleeping at daytime

C. the ways of sleep            D. not being able to go to sleep

49. Mark Twain lay on his side across the end of the bed because he_______.

A. was an old man         B. thought it was easy to go to sleep

C. was a famous writer      D. didn’t have much room to sleep in

50. The passage is mainly talking about___________.

A. sleep                   B. insomnia

C. how to get to sleep        D. the famous person’s beds