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13.Previous studies have suggested as many as 70percent of college students get insufficient(不充足的)sleep.But  new data released today that analyzed sleep habits of college-age users of Jawbone's UP fitness tracker suggests otherwise.
Jawbone looked at sleep data from college-age users who wear the company's UP fitness trackers and found that they actually average just over 7hours of sleep per night on weekdays and 7.38hours on weekend nights.The data comes from 18,498college-age users from 137schools across the country who wear the device and accounts for 1.44million nights of sleep data recorded by those individuals between 2013and 2016.Here are four more points about the research:
1.People at high-achieving schools tended to have later bedtimes
The data analytics team at Jawbone was also able to separate out sleep data for each school with UP wearers reporting data.They found that the tougher the school,according to the U.S.News ranking,the later the average college-age UP wearer at that school goes to bed.
2.Still,7hours may not be enough sleep
While the data from Jawbone may be encouraging,considering that previous research has found that some students sleep only 5.7hours a night on average.But Neil Kline,a sleep physician,points out that even this higher number isn't sufficient."There is much data that suggests that this age group needs more than seven or 7.5hours of sleep on average per night,"Kline claimed.
3.The data doesn't include naps
Another point,Kline said,is that the data doesn't include naps.Total daytime sleep-napping-tends to be difficult to account for because naps can be short and easily forgotten,he said.But they do affect total sleep.
4.Fitness-tracking students aren't exactly the norm
It's also important to note that the data from Jawbone comes from college-age people who purchased and used Jawbone UP fitness tracking devices,which means that the participants in this research do not necessarily make up a representative sample(样本)of college students in terms of socioeconomic status or lifestyle factors.

28.What does the underlined sentence mean in Paragraph 1?D
A.New data has the same results as the previous one.
B.New data and the previous one have many things in common.
C.New data from Jawbone may astonish most college students.
D.New data suggests that college students spend more time sleeping.
29.According to the new data,a student who does well in academic performance may probably sleepB.
A.less than 5.7hours a night
B.less than 7.5hours a night
C.early at night
D.over the night
30.Which of the following statements is TRUE according to the passage?A
A.The sample of college students is far from enough.
B.College students usually don't have naps at all.
C.College students sleep only 5.7hours a night on average.
D.Every college student across the country takes part in the research.
31.What is the author's purpose in writing this passage?C
A.To show the importance of sufficient sleep at night.
B.To explain why college students can't get sufficient sleep.
C.To tell readers some data about college students'sleep per night.
D.To offer college students some tips on handling insufficient sleep.

分析 本文属于说明文阅读,写出了先前的研究大部分大学生睡眠不足与最新的关于大学生睡眠时间的研究的对比(数据不包括午睡),告诉读者应该保持充足的睡眠.

解答 28.D  推理判断题,根据第一段Previous studies have suggested as many as 70percent of college students get insufficient(不充足的)sleep.But  new data released today that analyzed sleep habits of college-age users of Jawbone's UP fitness tracker suggests otherwise.可知先前的研究表明许多大学生睡眠不足,而新的数据表明,大学生们花更多的时间睡觉,故选D.
29.B  推理判断题,根据第四段"There is much data that suggests that this age group needs more than seven or 7.5hours of sleep on average per night,"Kline claimed.
可知根据新的数据,这个年龄的学生需要多余7或7.5个小时的睡眠,因此可推断一个在学习成绩上表现很好的学生可能睡的少于7.5个小时,故选B.
30.A  细节理解题,根据最后一段which means that the participants in this research do not necessarily make up a representative sample(样本)of college students in terms of socioeconomic status or lifestyle factors.可知这项研究的样本是有限的,因此A正确;误解分析:由第五段Another point,Kline said,is that the data doesn't include naps.可知这个研究不包括午睡,不是大学生不午睡,因此B错;由第四段 some students sleep only 5.7hours a night on average有些学生只睡5.7小时,因此C错;而D项并不是全国每一个大学生都参加了这一研究;故选A.
31.C  主旨大意题,通读全文发现这篇文章主要向我们介绍了现在大学生每晚睡眠时间的一些数据,故选C.

点评 考查学生的细节理解和推理判断能力.做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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