阅读理解。 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 bad night when they can not sleep. About one in three Americans has a problem with sleep. Many of these people can not fall asleep. This problem is called insomnia. This is not a new problem. Many famous people in history had insomnia. Some of these people had special (特别的) ideas to make them sleep. Benjaming Franklin,the famous statesman (政治家)and inventor (发明家), had four beds. He moved from one to another to fall asleep. King Lousis XIV of France had 413 beds and hoped that he could fall asleep in one of them. Mark Twain, the famous American writer, had a different way. He lay on his side on the end of the bed! 1. Most American people need_____ hours of sleep a night. A. 3 B. 10 C. 7-8 2. People need ______ sleep as they get older. A. more B. 1ess C. no 3. 'The problem is called insomnia. 'Here'insomnia' Means_______. A. sleep at daytime B. the ways of sleep C. not being able to (能够)go to sleep 4. Mark Twain lay On his side on 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 5. The passage is mainly talking about______. A. sleep B. insomnia C. how to get to sleep