英语阅读与表达Ellen Sims is an 18-year-old college student.She has

英语阅读与表达
Ellen Sims is an 18-year-old college student.She has an important exam tomorrow morning.Ellen is going to study all night.She is not going to sleep at all.Many college students,like Ellen,do this often.They think they can study all night.And they think that in the morning,they will remember everything that they studied the night before,Ellen thinks that this is a good way to study,but many doctors disagree.They say that sleep is very important for memory and brain development.Scientists in Harvard Medical School in the US studied sleep and memory.They studied 24 people.First,they asked the people to look at the picture and remember it.At night,they put the people in two groups of 12.Group One went to sleep.Group Two did not.A few days later,the scientist showed some picture to both groups.They asked the people to find the picture they saw before.The people in Group One did well.But the people in Group Two did not well.It wasn’t easy for them to remember the picture.What happened?Scientists say that sleep helps our memory.After we learn something new,sleep helps us remember it.And when we don’t sleep,we can forget new things.Scientists say that many teenagers,like Ellen,sleep too little.They go to school and they work ,too.They also spend time with their friends.They are always busy and they think that sleep doesn’t matter.But scientists say the brains of teenagers are still developing ,and sleep is a very important part of the development.When teens sleep less than six hours ,they can’t think clearly.That is not very helpful for a student who is taking an exam.根据短文内容回答下列问题：55.Is Ellen going to study all night before the history exam?56.Who studied sleep and memory?57.How many people were there in each group for this study?58.Why did the Group One remember the picture better?59.What can we learn from this passage?