Question

    It's no surprise that a night without enough sleep can lead to a bad morning.Does it also do harm to our bodies?

According to US sleep researcher David Dinges, not getting enough sleep can have serious side effects on our minds and bodies.

For the study, Dinges divided some people into three groups.The first group was allowed eight hours of sleep for two weeks;the second group was given six hours;the third group got four hours of sleep.

Dinges found that the people in the first group stayed normal while the people in the last two groups showed tiredness and negative feelings.

"When people don't have enough sleep,it’s hard to sense their happiness,"Dinges said."Also,they are less able to sense others' good feelings."

But if not having enough sleep can harm our health,can we get better later on?

“People think that sleep is like the bank that you can pay off your debt (债务)*at a later point in time,Us Sleep Scientist Matthew Walker told popular Science."But we now know that sleep is not like that.

According to Live Science,humans are the only animal species that don't have sleep storage (储存)systems,our brains（大脑）*cannot get back what we have lost.

So Scientists suggest that no matter how busy people are,they should always try to get enough sleep.

Here's the recommended*(建设)hours of sleep by age.Preschoolers(3 to 5 years):10 to 13 hours.School—age children(6 to 13 years):9 to 11 hours .Teenagers(14 to 17 years):8 to 10 hours.Adults(18 to 64 years):7 to 9 hours.Older adults(over 65 years):7 to 8 hours.

1.To get enough sleep,a five—year—old boy should go to bed before _______and get up at seven in the morning.

A.9:00 p.m. B.9:30 p.m. C.10:00 p.m. D.10:30 p.m.

2.According to the passage,if someone doesn't get enough sleep,he _______

A.can feel better after a good sleep later B.cannot return to a good condition

C.will need much time to get well again D.can still stay active for several days

3.A person with negative feelings always _______ .

A.shows interest in many things B.wants to share funny things

C.sees the dark side of something D.pays attention to others' good feelings

4.Which can be the best title of the passage?

A.The Importance of Sleep B.When to Get a Sleep

C.The Right Ways to Sleep D.A Research on Sleep Problems

Answer

1.A

2.B

3.C

4.D

【解析】

本文是一篇说明文，主要说明了研究表明睡眠不够会影响人们的身体和大脑，并给出了不同年龄段应该有的睡眠时间。

1.细节理解题。根据第10大段Preschoolers(3 to 5 years):10 to 13 hours.3-5岁：至少10个小时。可知，故选A。

2.细节理解题。根据第7大段“People think that sleep is like the bank that you can pay off your debt (债务)*at a later point in time,Us Sleep Scientist Matthew Walker told popular Science."But we now know that sleep is not like that.人们认为睡眠就像支付债务的银行一样，但是睡眠科学家告诉我们睡眠并不是像那样。根据第8大段According to Live Science,humans are the only animal species that don't have sleep storage (储存)systems,our brains（大脑）*cannot get back what we have lost.人类是唯一的没有睡眠储存的生物物种，我们的大脑不能找回我们丢失的睡眠。可知，人如果没有得到充足的睡眠，便不能回到好的情况中。故选B。

3.词义猜测题。根据第4大段while the people in the last two groups showed tiredness最后两组的人表现得疲倦，and连接并列单词。再根据第5大段"When people don't have enough sleep,it’s hard to sense their happiness,"当人们没有足够睡眠是很难感受幸福的。可知，是消极的意思。故选C。

4.最佳标题题。根据第2大段According to US sleep researcher David Dinges, not getting enough sleep can have serious side effects on our minds and bodies.研究表明睡眠不够严重影响身心和大脑。再根据第9大段So Scientists suggest that no matter how busy people are,they should always try to get enough sleep.所以科学家建议无论多忙都要得到足够睡眠。可知，是说明研究表明的睡眠问题。故选D。