题目内容
15．Experts recently suggested that teens should start adopting early bedtimes．Before you dismiss it as a habit suited only for young kids，consider that there are serious advantages in being well-rested．And now，even more research suggests that putting phones away before going to sleep is important to teens'well-being．A new study from Seton Hall University School of Health and Medicine Science found that 62percent of kids used their smart phones before bed，and it's causing less sleep and poor performance in school．
Those teens who text（发短信） before bedtime tend to go to sleep later，and get up later in the morning．Such behavior can be associated with mental health issues like depression or anxiety．Besides，once teens do receive a text，experts found，they tend to respond right away．Then the text conversation continues----resulting in an even later bedtime．
The study's co-author Dr．Peter Polos says this leads to excessive stimulation（过度刺激） at night．Light from electronic devices can block the secretion（分泌） of melatonin---a hormone（荷尔蒙） that promotes sleep，which makes sleep difficult in the face of overuse of smart phones at night．It's true!More screen time means less sleep time； other studies have suggested the same idea．
As for a final piece of advice，Dr．Sushanth Bhat says，since getting the proper amount of sleep is very important for brain development and learning in the teenage years，our study should encourage parents and guardians （监护人） to limit adolescent smart phone usage at night．Keep in mind that teens aren't the only ones addicted to their phones!Adults can also benefit from setting a tech curfew（宵禁） for themselves．After all，kids learn by example!
32．What is the text mainly about？D
A．How to promote sleep．
B．How kids learn from their parents．
C．The advantages of going to bed early．
D．The disadvantages of phone usage before bed．
33． Who are likely to go to sleep later according to the text？A
A．Kids having text conversations before bed．
B． Kids putting their phones away at night．
C．Kids studying their lessons hard at school．
D．Kids exercising with friends after school．
34．Melatonin canC．
A．make sleep difficult
B．lead to later bedtimes
C．help people fall asleep
D．wake people from a sleep
35．The author advises parents toC．
A．learn from their kids
B．get rid of smart phones
C．set a good example to their kids
D．try to benefit from hi-tech development．
分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了研究发现，青少年应该早点睡觉，并且睡觉之前不要玩手机．
解答 32．D．推理判断题．根据第一段And now，even more research suggests that putting phones away before going to sleep is important to teens'well-being可知课文主要讲的是在睡前玩手机的缺点；故选D．
33．A．细节理解题．根据文章Those teens who text（发短信） before bedtime tend to go to sleep later，and get up later in the morning可知发完短信的孩子可能去睡觉；故选A．
34．C．细节理解题．根据文章．Light from electronic devices can block the secretion（分泌） of melatonin---a hormone（荷尔蒙） that promotes sleep可知褪黑激素能帮助入眠；故选C．
35．C．细节理解题．根据最后一段Adults can also benefit from setting a tech curfew（宵禁） for themselves．After all，kids learn by example可知作者建议父母能以身作则，为孩子做榜样；故选C．
点评 考察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，再做出正确的选择．在做推理判断题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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