低头族注意！睡前看手机对健康有害！
Watching TV or phone screens(屏幕) before sleeping is bad for children’s health. Screen time means children go to bed later. They have less sleep, and they can not sleep well. Screens are small, so children can look at them in bed.
Children need more sleep than people of other age groups. For pre-school children, they need 13 hours of sleep a night. There are some reasons(原因) why watching screens are bad. First, the light from screens makes children think it is not in the evening. Then, videos keep children’s brains active, so they cannot sleep. At last, when children are watching screens, they are not exercising. But children need physical activities to make them tired.
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1.It’s bad for kids to watch TV __________.
A after breakfast
B in the afternoon
C before going to bed
D after using phones
解析：选C。C 细节理解题。根据第一段第一句 Watching TV or phone screens(屏幕) before sleeping is bad for children’s health.可知睡觉前看电视或手机屏幕对孩子的健康有害，故选 C。
2.Which of the following(下列的) people should sleep longer?
A A 9-year old student.
B An English teacher.
C An old woman.
D A middle-aged man.
解析：选A。A 推理判断题。根据第二段第一句 Children need more sleep than people of other age groups.可知儿童比其他年龄段的人需要更多的睡眠，选项中一个九岁的学生属于儿童，符合文意，故选 A。
3.How many reasons did the writer mention(提到)?
A One.
B Two.
C Three.
D Four.
解析：选C。C 细节理解题。根根据第二段 There are some reasons why...和 First...Then...At last...可知可知手机屏幕对孩子的健康有害的原因有三个，故选 C。
4.What makes children hard to sleep?
A Screen lights.
B Videos.
C Exercise.
D Sleep.
解析：选B。B 细节理解题。根据第二段中的 Then, videos keep children’s brains( 头 脑 ) active, so they cannot sleep.可知视频使孩子的大脑活跃，所以他们无法入睡，故选 B。
5.What can make children feel tired?
A Watching TV.
B Going to bed.
C Having classes.
D Taking exercise.
解析：选D。D 细节理解题。根据第二段最后两句...they are not exercising. But children need physical activities to make them tired.可知孩子们需要运动锻炼，这可以使他们感到疲劳，故选 D。