How much sleep do we need? People are all different. Some people need only three or four h

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 hard to fall asleep. About one in three(三分之一) Americans have a problem with sleep. Many of these people can not fall asleep. The name of this problem is insomnia(失眠症). 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 Twain lay(躺) on his side across the end of his bed.
根据短文内容，判断正(A)误(B)。（5分）
【小题1】Different people need different amounts of sleep(睡眠时间).
【小题2】Most Americans sleep more than 8 hours a night.
【小题3】If a person has insomnia, he can never fall asleep.
【小题4】About 1/3 of Americans have a problem with sleep.
【小题5】Mark Twain had four beds to make himself sleep.A

(答案→)A 解析：这篇短文介绍了美国大约有三分之一的人有睡眠问题，其中也谢历史名人的睡眠问题也很严重。【小题1】根据People are all different.及下文描述，可知本句表述正确。【小题2】根据Most Americans sleep seven to eight hours a night.描述，可知本句表述错误。【小题3】根据Many of these people can not fall asleep. The name of this problem is insomnia(失眠症).不能入睡并不是永远不能入睡。可知本句表述错误【小题4】根据About one in three(三分之一) Americans have a problem with sleep.可知本句表述正确。【小题5】根据Benjamin Franklin had four beds. He moved from bed to bed to fall asleep.描述，可知本句表述错误。

这下我知道了