3．When US student Olivia Priedeman，17，woke up one morning，she thought she had had a dream about making plans with a friend．
But it wasn't a dream．Her phone showed that during the night，Priedeman had read a text message from her friend．She did it while she was fast asleep．
Reading and sending text messages while asleep-called"sleep texting"-is an unusual sleep behaviour，similar to sleepwalking．It's also a growing concern（關心的事） among doctors：young people can't live without their cell phones．
One in three teenagers sends more than 100 text messages a day，according to the Pew Internet & American Life Project．And at least four out of five teenagers said they sleep with their phone on or near their bed．
Elizabeth Dowdell，a professor at Villanova University in Pennsylvania，has studied sleeping texting．She said that having a phone nearby all night is a big part of the problem．
Andrew Stiehm，a sleep medicine expert with Allina Health in Minnesota，agrees．It's possible for the part of the brain that controls motor skills （動作技能） to wake up，while the part of the brain that controls memory and judgment（判斷） may be still asleep．That's why some people can perform basic movements---such as walking，talking，texting or even driving-while they're sleeping．Some of Dowdell's students said that they're disturbed by their nighttime texting behavior．But because sleep texting is unconscious，it's a difficult habit to break．Dowdell said she knows of some students who wear socks on their hands to keep themselves from texting．
Marjorie Hogan，a doctor at Hennepin County Medical Center in Minneapolis，Minnesota，suggests keeping all electronic devices（電子設備） outside the bedroom at certain times．
51．What happened to Olivia Priedeman？D
A．She sleepwalked to a friend's house．
B．She dreamed of making plans with a friend．
C．She phoned one of her friends during the night．
D．She read a text message from her friend while asleep．
52．Which part the brain controls keeps awake while asleep？D
A．judgment
B．language
C．memory
D．motor skills
53．What does the underlined word"unconscious"mean？B
A．無法
B．無意識的
C．無反應的
D．無規(guī)律的
54．What does doctor Hogan suggest people who sleep text do？C
A．Stop text during the daytime．
B．Take some medicine to control the behaviour．
C．Keep their phones out of their bedrooms while they sleep．
D．Wear socks on their hands to stop themselves from texting．
55．We can learn from the passage thatC．
A．It's easy to give up a sleep texting habit．
B．One in three teenagers has a sleep texting habit．
C．Sleep texting can reduce the quality of one's sleep．
D．Sleep texting does more harm to one's health than sleepwalking．
分析 這篇短文主要介紹了睡眠短信類似于夢游"是一種不尋常的睡眠行為．形成這種行為的原因是頻繁的使用手機并發(fā)信息．專家說在睡眠中大腦控制運動技能的一部分是醒著的而大腦的控制記憶和判斷一部分可能還在睡覺．所以出現(xiàn)了睡眠短信這一現(xiàn)象．
解答 51-55 DDBCC
51：D．細節(jié)理解題．根據短文第二段Her phone showed that during the night，Priedeman had read a text message from her friend．She did it while she was fast asleep．描述，那不是一個夢．她的手機顯示，在夜間她讀過從她的朋友發(fā)來的短信．可知是她睡著的時候做的這件事．故選D
52：D．細節(jié)理解題．根據短文It's possible for the part of the brain that controls motor skills （動作技能） to wake up，while the part of the brain that controls memory and judgment（判斷） may be still asleep．描述，有可能大腦控制運動技能的部分醒來，而大腦的控制記憶和判斷一部分可能還在睡覺．可知在睡眠中大腦控制運動技能的一部分是醒著的，故選D
53：B．詞意猜測題．根據上下文可知因為睡眠短信是無意識的，所以這是一個難以打破的習慣．故選B．
54：C．細節(jié)理解題．根據最后一段suggests keeping all electronic devices（電子設備） outside the bedroom at certain times．描述，可知醫(yī)生建議在睡覺時將所有電子設備移到臥室以外．故選C．
55：C．是非判斷題．根據But because sleep texting is unconscious，it's a difficult habit to break．可知A錯誤，根據 One in three teenagers sends more than 100 text messages a day，可知B錯誤．根據第三段可知sleep texting is similar to sleepwalking，故D項錯誤，根據短文大意，故C正確，故選C．
點評 應觀察全文的結構安排，理解文章濃墨重筆寫的"重心"，考慮文章組織材料及支撐性細節(jié)是服務于什么的，分析故事的發(fā)展結局都是圍繞什么中心大意來安排的．
