Question

    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（游戏机）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 related 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 related 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.

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.

2.The underlined phrase “drop off” in the third paragraph may mean “________”.

A.get up B.pay for

C.take over D.fall asleep

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.

4.What does Dr Mari Hysing advise people to do?

A.change the children’s sleeping time

B.find ways to stimulate nervous system

C.make children sleep as they could

D.remove electronic devices from children’s bedroom

Answer

1.D

2.D

3.A

4.D

【解析】

本文是一篇说明文文。主要介绍了青少年上网花费的时间影响他们的睡眠时间和质量。

1.细节理解题。根据第二段的Girls spent longer on their computers chatting online while boys spent longer playing games on computers.（女孩花更多的时间在电脑上上网聊天，而男孩花更多的时间在电脑上玩游戏。）可知，男孩更喜欢花时间在电脑游戏上。故选D。

2.词义猜测题。根据第二段的The study found poorer quality sleep was related to more time spent on such devices, and it often took more than an hour to drop off.（研究发现，较差的睡眠质量与花在这些设备上的时间有关，通常需要一个多小时才能入睡。）可知，过久使用电子设备之后需要一个小时才能入睡，另外根据本段的Total daytime screen use of more than four hours was related to a 49 percent greater risk of taking longer than 60 minutes to fall asleep.（白天看屏幕时间超过4小时，入睡时间超过60分钟的风险要高出49%。）中的fall asleep关键词组也可知，本段主要讲述的是睡眠质量差和可能是过多使用这些设备有关，越长时间使用电子设备，入睡时间越长，故可推知drop off相当于fall asleep意为“入睡”，故选D。

3.细节理解题。根据第三段的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.（但那些花超过两小时发电子邮件或上网聊天的人，睡眠不足五小时的可能性是其他人的三倍多。）可知，如果孩子上网超过两个小时会缺乏睡眠。故选A。

4.细节理解题。根据最后一段的The recommendation is not to have a TV in the bedroom（建议不要在卧室里放电视）可知，Mari Hysing博士建议将电子设备从儿童卧室移开。故选D。