Question

【题目】Getting less sleep has become a bad habit for most American kids. According to a new survey(调查) by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7- to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.

How much sleep you need depends a lot on your age. Babies need a lot of rest: most of them sleep about 18 hours a day! Adults need about eight hours. For most school-age children, ten hours is ideal(理想的). But the new National Sleep Foundation survey found that 35% of 10- to 12-year-olds get only seven or eight hours. And guess what almost half of the surveyed kids said they do before bedtime? Watch TV.

“More children are going to bed with TVs on, and there are more opportunities(机会) to stay awake, with more homework, the Internet and the phone,” says Dr. Mary Carskadon, a sleep researcher at Brown University Medical School. She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep. Other experts say part of the problem is chemical. Changing levels of body chemicals called hormones not only make teenagers’ bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

Because sleepiness is such a problem for teenagers, some school districts have decided to start high school classes later than they used to. Three years ago, schools in Edina, Minnesota, changed the start time from 7:25 am to 8:30 am. Students, parents and teachers are pleased with the results.

【1】What is the new National Sleep Foundation survey on?

A. American kids’ sleeping habits. B. Teenagers’ sleep-related diseases.

C. Activities to prevent sleeplessness. D. Learning problems and lack of sleep.

【2】How many hours of sleep do 11-year-olds need every day?

A. 7 hours. B. 8 hours. C. 10 hours. D. 18 hours.

【3】Why do teenagers go to sleep late according to Carskadon?

A. They are affected by certain body chemicals.

B. They tend to do things that excite them.

C. They follow their parents’ examples.

D. They don’t need to go to school early.

Answer 1

【答案】

【1】A

【2】C

【3】B

【解析】试题分析：本文属于调查报告，首先用数据告诉我们美国孩子睡眠状况堪忧，接着告诉我们孩子在不同年龄段需要不同的睡眠时间，然后分析了孩子晚睡的原因，最后介绍了一些学校为了让孩子们有更多的睡眠时间而推迟了上课的时间。

【1】A细节理解题，根据文中第一段列举了一些数据，向我们说明美国有51%的10到18岁的孩子上床睡觉的时间偏晚，也调查了60%的7到12岁的孩子在白天感到疲惫，15%的孩子会在学校睡着，所以这些调查都是关于美国孩子的睡眠习惯的，故选A.

【2】C细节理解题，根据第二段“For most school-age children, ten hours is ideal”, 所以11岁的上学小孩子的睡眠时间需要10个小时，故选C.

【3】B细节理解题，根据第三段“She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep”,所以她认为孩子们睡觉晚的原因是他们会在睡前做一些让他们兴奋的活动，故选B.