1.The longer a teenager spends using electronic devices such as computers and smartphones,the worse their sleep will be,a study of nearly 10,00016-to 19-year-olds suggests.
More than two hours of screen time after school was strongly linked to both delayed and shorter sleep.Almost all the teens from Norway said they used the devices shortly before going to bed.Many said they often got less than five hours sleep a night.
The teens were asked questions about their sleep routine on weekdays and at weekends,as well as how much screen time they clocked up outside school hours.On average,girls said they spent around five and a half hours a day watching TV or using computers,smartphones or other electronic devices.And boys spent slightly more time in front of a screen around six and a half hours a day,on average.Playing computer games was more popular among the boys,whereas girls were more likely to spend their time chatting online!
Any type of screen use during the day and in the hour before bedtime appeared to disturb sleep-making it more difficult for teenagers to nod off.And the more hours they spent on these devices,the more disturbed their sleep became:When daytime screen use totalled four or more hours,teens had a 49%greater risk of taking longer than an hour to fall asleep.These teens also tended to get less than five hours of sleep per night.
Dr.Hysing said her findings had suggestions for the wider population as so many people use these devices."We know that sufficient sleep is essential for good physical and mental health.Logging off may be one important step toward securing a good night's sleep."
Prof Rnssell Foster,an expert the University of Oxford,said,"This is an important study as it provides practical evidence that the use of electronic devices before bed does indeed reduce sleep duration."He said teenagers should be warned of this.
28.What is stressed in the first two paragraphsB?
A.Teens now tend to have more problems with studies.
B.Teens get harder to fall asleep with more screen time.
C.Teens addicted to screen are likely to be more energetic.
D.Teens'sleep duration has nothing to do with their screen time.
29.By asking questions,the study findsC.
A.boys are more likely to chat online than girls
B.girls are more frequent on the screen than boys
C.teens are attracted by different electronic devices
D.teens use the screen for the same purpose
30.What does the phrase"nod off"in the fourth paragraph meanD?
A.shut off B.get excited C.focus on D.fall asleep
31.How does Prof Russell Foster feel the studyA?
A.Beneficial. B.Uncaring. C.Doubtful.D.Dissatisfied.
分析 本文屬于說明文閱讀,作者通過這篇文章向我們敘述了研究表明青少年們被各種電子設備吸引了,而使用電子設備時間越長,他們的睡眠會更糟糕,研究結果建議很多人減少使用這些設備.告訴我們應減少使用電子設備的時間,保持身體健康.
解答 28.B.細節理解題.根據文章第一段"The longer a teenager spends using electronic devices such as computers and smartphones,the worse their sleep will be",可知一個十幾歲的青少年使用電子設備時間越長,如電腦和智能手機,他們的睡眠會更糟糕;故選B.
29.C.細節理解題.根據文章第三段"girls said they spent around five and a half hours a day,And boys spent slightly more time in front of a screen around six and a half hours a day",女孩說,他們每天花五個半小時,男孩花了更多一點的時間在屏幕前面,平均每天六個半小時,可知他們被各種電子設備吸引了;故選C.
30.D.推理判斷題.根據文章第四段"Any type of screen use during the day and in the hour before bedtime appeared to disturb sleep-making",任何類型的屏幕使用白天的小時睡覺前出現擾亂睡眠,可知應與睡眠有關;故選D.
31.A.細節理解題.根據文章最后一段"Prof Rnssell Fostersaid,"This is an important study"He said teenagers should be warned of this",這是一個重要的研究,他說,青少年應該受到警告,可知這個研究是有益的;故選A.
點評 考察學生的細節理解和推理判斷能力,做細節理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據文章事實進行合乎邏輯的推理判斷.