magazine introduces a fresh new topic with articles，experiments and creative things to make”可知，TOKNOW杂志刊载关于新话题的文章。故选B。

?

How much should you pay if you make a 12－month

subscription to TOKNOW with gift pack from China. __D__

A．￡55. C．￡65.

B．￡60. D．￡70.

解析：考查细节理解。根据Annual Subscription with Gift Pack部分中的“Rest of World ￡70”可知，在中国按年订购有礼包的TOKNOW杂志需要￡70。故选D。

? Subscribers of TOKNOW would get __B__. A．free birthday presents

B．full refund within 28 days

C．membership of the TOKNOW club D．chances to meet the experts in person

解析：考查细节理解。根据文中的“Refund Policy—the subscription can be cancelled within 28 days and you can get your money back”可知，28天之内退订的订购者可以获得全额退款。故选B。

C

(2017·浙江，B)

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.

文章大意：本文是一篇说明文。文章指出美国孩子睡眠缺乏的问题，列举了不同年龄段的孩子所需的睡眠时间、青少年晚睡的原因以及学校为解决青少年的睡眠问题所采取的措施。

? What is the new National Sleep Foundation survey on？ __A__ A．American kids’ sleeping habits. B．Teenagers’ sleep－related diseases. C．Activities to prevent sleeplessness. D．Learning problems and lack of sleep.

解析：细节理解题。根据文章第一段列举的一系列数字可知，国家睡眠基金

会对一定年龄段孩子的睡眠习惯进行了调查，这也呼应了本段第一句“Getting less sleep has become a bad habit for most American kids.”，故选A项。

10 How many hours of sleep do 11－year－olds need every day？ ○__C__

A．7 hours. C．10 hours.

B．8 hours. D．18 hours.

解析：细节理解题。根据文章第二段第四句“For most school－age children，ten hours is ideal(理想的).”可知选C项。

11 Why do teenagers go to sleep late according to Carskadon？ ○__B__

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.

解析：细节理解题。根据文章第三段第一句“More children are going to bed with TVs On，and there are more opportunities to stay awake，with more homework，the Internet and the phone..，”以及第二句“...these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep.”可知，孩子们在睡觉前看电视、写作业、上网或打电话都容易让他们产生兴奋感而不愿意睡觉，故选B项。

D

(2017·全国Ⅲ，A)

San Francisco Fire Engine Tours

San_Francisco_Winery_Tour

Running：February 1st through April 30th

This delicious tour goes through the city on its way to Treasure Island where we will stop at the famous Winery SF.Here you can enjoy 4 pours

of some of the best wine San Francisco has to offer.(Included in ticket price)

Departing from the Cannery：Tour times upon request Duration (时长)： 2 hours Price： $ 90

Back_to_the_Fifties_Tour

Running： August 16th through August 31 st

This tour transports you back in time to one of San Francisco’s most fantastic periods，the 1950s！ Enjoy fun history as we take you through San Francisco for a free taste of ice cream.

Departing from the Cannery：5：00 pm and 7：30 pm Duration ：2 hours Price： $ 90

Spooky_Halloween_Tour

Running： October 10th through October 31 st

Join us for a ride through the historical Presidio district.Authentic fire gear(服装) is provided for your warmth as our entertainers take you to some of the most thrilling parts of San Francisco.

Departing from the Cannery： 6： 30 pm and 8： 30 pm Duration： 1 hour and 30 minutes Price： Available upon request Holiday_Lights_Tour

Running：December 6th through December 23rd

This attractive tour takes you to some of San Francisco’s most cheerful holiday scenes.Authentic fire gear is provided for your warmth as you get into the holiday spirit.

Departing from the Cannery：7：00 pm and 9：00 pm