You may know about junk food like French fries.But do you know about junk sleep？
   Recently，a British survey found that electronic products （電子產(chǎn)品） in teenagers' bedrooms are affecting （影響） their sleep.The survey was done among 1，000 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    ▲   ." said Dr.Chris ldzikowski， "We call it junk sleep.It means you don't get enough sleep and the quality （質(zhì)量） of the sleep is bad，too.If you don't get good rest，you won'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 bedrooms.And many of them have all three.

（1）This passage is mainly about

C

C

.
A．junk food
B．electronic products
C．junk sleep
（2）

B

B

of the children in the survey sleep only 4 to 7 hours a day.
A．200
B．300
C．1，000
（3）Which of the following can be put in    ▲   ？

A

A

A．worrying
B．exciting
C．boring
（4）Junk food and junk sleep are similar to each other in the way that

A

A

.
A．they are both low（低） in quality
B．people enjoy both in their free time
C．they are both produced （生產(chǎn)） in factories