If you don’t get enough sleep at night, you’ll have ________ energy the next day．

1. A.
   fewer
2. B.
   much
3. C.
   less
4. D.
   more

If you don’t get enough sleep at night, you’ll have _____ energy the next day.

A．fewer        B．much        C．less         D．more

Researchers(研究者) say that nearly two thirds of children don’t get enough sleep, and this can make them nervous and slower at school. So how long should young people sleep each night? The answer is between 8 and 10 hours. If you don’t get enough sleep at night, you’ll have less energy the next day.

A report shows that children sleep less because they have TVs and computers in their rooms, and busy parents don’t read to their younger children at night any more. The traditional “bedtime story” helps children to relax and fall asleep peacefully. Children with TVs and computers in their bedrooms were more likely to sleep badly, and to get less than eight hours sleep. Even losing one hour’s sleep a night can mean that children do worse than usual at school.

British scientists think that your brain(大脑) keeps working while you’re asleep. To show that they were right, they gave two groups of people a problem to work out. One group went to sleep, and the other group stayed awake. You want to know the result? The people who slept worked out the answer more quickly. Researchers explained that their brains were trying to find the answer while the people were asleep. So, make sure you get enough sleep tonight, and you’ll be at your best tomorrow!

40. Why is sleep good for your health?

　 A. Sleeping helps you eat less.　　　　　　　

　 B. Sleeping makes you need less energy.

　 C. Sleep is good for the brain as well as the body.

　 D. You can solve more problems while you are sleeping.

41. What happens to children at school if they don’t get enough sleep?

　 A. They can’t run faster.　　　　　　　　　　　　　　　　　　 B. They do less well at school.

　 C. They walk more slowly.　　　　　　　　　　　　　　　　　 D. They will be afraid of learning.

42. How does a bedtime story help children get a good night?

　 A. Children get to sleep earlier.

　 B. Children have more energy.

　 C. Children feel it helpful to relax.　　　　　　　　　　　

　 D. Children become more interested in stories.

43. What did the British scientists’ experiment show?

　 A. Parents should read bedtime stories.

　 B. Sleep helps children learn to tell more stories.

　 C. Losing sleep means children don’t learn well.

　 D. Your brain is still working while you are sleeping.