You may know about"junk food"like hamburgers．But do you know about"junk sleep"？
A British survey （调查）found that electronic products（电子产品） in teenagers bedrooms are affecting（影响） their sleep．
The survey was among（在…之间） 1，000British kids from 12to 16．It found that 30% of them got just 4to 7hours of sleep every day．But doctors say they need 8to 9hours．
Almost 25% 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 Idzikowski，a British expert，"We call it‘junk sleep'，It means you don't get enough sleep and the quality（质量）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% of the kids felt tired each day，with girls between 13and 16feeling the worst．Nearly all the teenagers have a phone，Mp4or TV in their bedrooms．And many of them have all three．

(1) This passage is about______．

A. junk food	B. the importance of sleep
C. electronic products	D. junk sleep

(2) ______ of the children in the survey sleep only 4to 7hours a day．

A. 200

B. 300

C. 500

D. 1，000

(3) "Junk sleep"means______．

A. people don't have enough sleep

B. the quality of the sleep is good

C. people don't like sleeping

D. people have enough sleep

(4) Which of the following is TRUE according to the passage？______

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

B. Few teenagers have a phone in their bedrooms．

C. Teenagers spend too much time on electronic products．

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

(5) The passage tells people______．

A. not to buy electronic products

B. to stop using electronic products

C. to use electronic products carefully

D. not to eat junk food．