How much sleep do we need? People are all different. Some people need only three or four hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep seven to eight hours a night.

Some people find it is hard to fall asleep. About one in three Americans have a problem with sleep. Many of these people can not fall asleep. The name of this problem is insomnia(失眠癥). Many famous people in history had insomnia. Some of these people have special(特殊的) ideas to make themselves sleep. Benjamin Franklin had four beds. He moved from bed to bed to fall asleep. Mark Twian lay(躺) on his side across the end of his bed.

根據(jù)短文內(nèi)容，判斷正（T）誤（F）。

1.Different people need different amounts of sleep(睡眠時(shí)間).

2.Most Americans sleep more than 8 hours a night.

3.If a person has insomnia, he can never fall asleep.

4.About 1/3 of Americans have a problem with sleep.

5.Mark Twian had four beds to make himself sleep.

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