The text helps US to know more about teenagers’__________．

A．daytime activities

B．sleeping habits

C．mental problems

D．studying methods

查看答案及解析进入在线模考

参考答案

答案解析

主旨题。题干意为“本文有助于我们了解更多青少年的__________。”阅读原文可知，本文在重点讲述青少年的睡眠问题，包括导致青少年睡眠晚的原因，睡眠推迟带来的负面影响(如扰乱生物钟、导致睡眠不足、影响出勤率和学习效果等)，继而提出可以通过上课时间推迟来满足睡眠需求。全文始终在围绕青少年的睡眠问题展开。故B正确。

你可能感兴趣的试题

1 根据下面资料，回答题。
Chica90’s Children’s Hospital is the lucky receiver of a surprise$18 million gift from Gladys Holm．She once was a secretary who never earned more than$15，000 a year and never married．
She lived alone in a small flat in Chica90，and was a volunteer at the Children’s Hospital．She was called the“Teddy Bear Lady”because she brought toy animals to sick children on her regular visits．But Miss Holm，who died in 1996 at the age of 86，was also a long—time buyer of stocks(股票)．Over the years，she saved money that rose up tO$18 million，which she left to the Children’s Hospital．It was the largest single donation in the hospital’s 115-year history．The hospital president，Jan Jennings，was shocked when she heard the news．“When Miss Holm’s lawyer called to tell me how much that money was，I asked him to repeat it，since l was certain I had mis-heard．”
Why did Gladys Holm feel so strongly about the Children’s Hospital?Jennings said the hospi-tal first touched Miss Holm’s heart nearly 50 years ago，when doctors there saved the life of her friend’s daughter．She never forgot the happiness she felt all those years ago．
Holm’s gift will be devoted to heart disease research．People at the hospital said they regretted that they couldn’t thank Miss Holm for the surprising gift．
According to the text，Miss Holm built up her fortune by__________．

A．playing Teddy Bear Lady

B．working as a secretary

C．helping in the hospital

D．buying stocks

查看解析在线模考

2 Why did Jan Jennings ask the lawyer to repeat what he said?

A．She never expected Miss Holm would donate anythin9．

B．She wanted to make sure who Gladys Holm was．

C．She had seldom received donations before．

D．She thought there was a mistake．

查看解析在线模考

3 Miss Holm’s love for the Children’s Hospital grew from__________．

A．a happy life living with children

B．a satisfying job given by the hospital

C．an unforgettable experience many years ago

D．a valuable gift she received from the hospital

查看解析在线模考