题目内容：

You may know about “junk food” like French fries. But do you know about “junk sleep”? Recently， a British survey found that electronic products(电子产品) in teenagers' bedrooms are affecting(影响)their sleep.

The survey was done among 1，0 00 British kids from 12 to 16. It found that 30 percent of them got just 4 to 7 hours of sleep every day. But doctors say they need 8 to 9 hours. Almost a quarter of the kids said they fell asleep more than once a week while watching TV， listening to music or using other electronic products.

“This is very worrying.” said Dr Chris ， a British expert， “We call it ‘junk sleep’， It means you don't get enough sleep and the quality of the sleep is bad， too. If you don't get good rest， you don't perform well in school the next day.”

The survey found that 40 percent of the kids felt tired each day， with girls between 13 and 16 feeling the worst. Nearly all the teenagers have a phone， Mp5 or TV in their bedroom. And many of them have all three.

1.This passage is mainly about ________.

A．junk food            B．junk sleep

C．electronic products   D．the importance of sleep

2.________ of the children in the survey sleep only 4 to 7 hours a day.

A．200      B．300    C ．500            D．1，000

3.“Junk food” and “junk sleep”are similar to each other in the way that ________.

A．they are both low in quality

B．they are both produced in factories

C．people enjoy both in their spare time

D．they are both good to people's health

4.Which of the following is TRUE according to the passage?

A．Teenagers need 4 to 7 hours of sleep each day.

B．Few of the teenagers have a phone in their bedrooms .

C．Teenagers spend too much time on electronic products.

D．Girls between 15 and 16 spend the least time on electronic products.

5.Which of the following is the best solution to the problem?

A．Parents watch TV together with their children.

B．Forbid teenagers to use any electronic product.

C．Teenagers should be limited (限制) to their use of the electronic products.

D．The use of mobile phone and Mp5 is not allowed at school.