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) of seven to eight hours a night. After the age of fifty, the average sleeping time goes down to 6.5 hours a night.
Most people have a bad night when they can’t fall asleep (入睡). The name of this problem is called insomnia.
This isn’t a new problem. Many famous people in history had insomnia, too. Some of these people had special ideas to make them sleep. Benjamin Franklin, the famous inventor, had four beds. He moved(移动) from one to another to fall asleep. King Louis XI V (国王路易十四) of France had four hundred and thirteen beds and hoped to 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 his bed.
After the age of fifty, the average sleep hours are_______ a night.

A．3 hours

B．7or 8 hours

C．6.5 hours

D．10 hours

Which of the following is TRUE?

A．King Louis XI V was an American.

B．Many famous people in history had a bad night when they couldn't fall asleep.

C．Benjamin Franklin was a famous writer.

D．Most young Americans sleep for an average of 6.5 hours a night.

Why did King Louis XI V of France have more than four hundred beds?

A．Because he hoped to fall asleep.

B．Because he was a famous inventor.

C．Because he had a lot of money.

D．Because he liked to lie on his side across the end of his bed.

What does the word insomnia mean (意思) in Paragraph (段落) 2?

A．too many beds

B．sleep well

C．can’t sleep well

D．problems

What’s Paragraph (段落) 1 talking about?

A．The history of sleep.	B．How much sleep do we need?
C．The story of famous people.	D．Why can’t we sleep?