青少年长时间玩电子产品对健康危害大，家长需警惕！
Teenagers who spend more time watching TV, using iPads and playing electronic games take longer to fall asleep and get poorer quality rest. A new study suggests the growth in use of electronic media devices by children could harm their physical and mental health.
The 16-19-year-olds were asked how much screen time they spent outside school hours, and on what activities, for any of six electronic devices: computer, tablet, smartphone, MP3 player, games console and TV. They were also asked questions about their sleep routine on weekdays and at weekends: when they normally went to bed and got up; how much sleep they needed to feel rested; and how long it took them to get to sleep. Girls spent longer on their computers chatting online while boys spent longer playing games on computers.
The study found poorer quality sleep was linked to more time spent on such devices, and it often took more than an hour to drop off. Total daytime screen use of more than four hours was linked to a 49 percent greater risk of taking longer than 60 minutes to fall asleep.
On average, the teens said they needed 8-9 hours of sleep to feel rested. But those who spent more than two hours emailing or chatting online were more than three times as likely to sleep for less than five hours. Those spending more than four hours in front of any screen were 3.5 times as likely to sleep for less than five hours. Computers were the device most likely to cause problems.
Dr Mari Hysing, of Uni Research Health, Bergen, said screen use may simply replace sleeping time or it may affect sleep by stimulating the nervous system. It is also possible that the light from electronic devices may affect a teenager’s body clock. “The recommendation is not to have a TV in the bedroom,” added Dr Mari Hysing.
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1.What do boys prefer to do on the Internet?
A They prefer to watch TV on computers.
B They prefer to get solutions for homework.
C They prefer to make friends with others.
D They prefer to spend time on computer games.
解析：选D。细节理解题。根据第二段最后一句Girls spent longer on their computers chatting online while boys spent longer playing games on computers.可知男孩在网上大多数是玩电脑游戏的。故选D。
2.The underlined phrase “drop off” in the third paragraph may mean “ _____”.
A get up
B pay for
C take over
D fall asleep
解析：选D。词义猜测题。根据第三段前后语境及第二句Total daytime screen use of more than four hours was linked to a 49 percent greater risk of taking longer than 60 minutes to fall asleep可知长时间玩电子产品的青少年睡眠不好，通常需要超过一个小时的时间才能入睡，所以drop off在此处的意思为“入睡”，故选D。
3.What will happen if children spend over two hours online?
A They will suffer from lack of sleep.
B They will sleep for over eight hours.
C They will feel excited during daytime.
D They will create a new body clock.
解析：选A。根据第四段第一、二句On average, the teens said they needed 8-9 hours of sleep to feel rested. But those who spent more than two hours emailing or chatting online were more than three times as likely to sleep for less than five hours.可推知孩子们如果上网的时间超过两个小时就可能会缺少睡眠，故选A。
4.Dr Mari Hysing suggested that ______.
A people change the children’s sleeping time
B people find ways to stimulate nervous system
C people remove TV from children’s bedroom
D people should make children sleep as they could
解析：选C。细节理解题。根据最后一段最后一句的The recommendation is not to have a TV in the bedroom可知Dr Mari Hysing建议卧室里不应该有电视，故选C。