17．Social networking websites are causing alarming changes in the brains of young users，a famous scientist has warned．Sites such as Facebook，Twitter and Bebo are said to shorten attention spans （幅度），encourage instant satisfaction and make children more self-centered．
Warnings from neuroscientist （神經(jīng)系統(tǒng)科學(xué)家） Susan Greenfield will disturb the millions whose social lives depend on surfing their favorite websites each day．But they will strike a chord （弦） with parents and teachers who complain that many teenagers lack the ability to communicate or concentrate away from their screens．
More than 150million use Facebook to keep in touch with friends，share photographs and videos and post regular updates of their movements and thoughts．A further six million have signed up to Twitter，the"micro-blogging"service that lets，users exchange text messages about themselves．But while the sites are popular and extremely profitable，a growing number of psychologists and neuroscientists believe they may be doing more harm than good．
Baroness Tarot，an Oxford University neuroscientist believes repeated exposure could rewire the brain．Computer games and fast-paced TV shows were also a factor，she said．"My fear is that these technologies are weakening the brain to the state of small children who axe attracted by buzzing noises and bright lights，who have a small attention span and live for the moment．""I often wonder whether real conversation in real time may eventually give way to these easier and faster screen dialogues，in much the same way as killing and butchering an animal to eat has been replaced by the convenience of packages on the supermarket shelf，"she said．
Psychologists have also argued that digital technology is changing the way we think．They point out that students no longer need to plan their term papers before starting to write-thanks to word processors they can edit as they go along．
A study by the Broadcaster Audience Board found teenagers now spend seven and a half hours a day in front of a screen．Educational psychologist Jane Healy believes children should be kept away from computer games until they are seven．Most games only excite the"flight or fight"areas of the brain，rather than the areas responsible reasoning．
Sue Palmer，author of Toxic Childhood，said："We are seeing children's brain development damaged because they don't engage in the activity they have engaged in for thousands of years．I'm not against technology and computers．But before they start social networking，they need to learn to make real relationships with people．"
50．According to the passage，social networking websites mightC．
A．encourage young users constant satisfaction
B．lengthen young users'attention span
C．make young users more selfish
D．help young users communicate better with their families
51．A neuroscientist may worry that sites like Facebook mayD．
A．help children learn to make real relationships with people in society
B．encourage students not to plan their term papers before starting to write
C．disturb those whose social lives depend on surfing their favorite websites
D．make real conversation in real time give way to easier and faster screen dialogue
52．From the passage we can infer thatC．
A．Baroness Tarot agrees websites cause small children's small attention span
B．Jane Healy believes computer games can do good to children's reasoning
C．Susan Greenfield's warnings have been brought to wide public attention
D．Sue Palmer's book Toxic Childhood discusses the development of networking
53．What is the purpose of this passage？B
A．To tell us the conflict between neuroscientists and psychologists on websites．
B．To present some negative opinions on social networking websites．
C．To offer advice on the problem of brain damage caused by social networking．
D．To analyse how social networking websites cause damage in the brains of teenagers．
54．From Baroness Tarot's example of"killing and butchering an animal to eat"，we can learn he is worried thatC．
A．technologies are weakening the brain to the state of small children
B．small children have a small attention span and live for the moment
C．real conversation in real time may be replaced by easier and faster screen dialogues
D．killing and butchering an animal to eat leads to the convenience of the supermarket．
分析 本文屬于社會現(xiàn)象類的短文閱讀．主要描述了一些社交網(wǎng)站如Facebook等使孩子過分依賴網(wǎng)絡(luò)，整天沉浸在虛擬的社會中，過分迷戀網(wǎng)絡(luò)游戲等，他們變得比較自私，不愿接觸社會等，這引起了許多專家和普通大眾的注意，并提出了一些切實的意見和忠告．
解答 50-54CDCBC
50．C．細節(jié)理解題．根據(jù)開頭一段描述encourage instant satisfaction and make children more self-centered可知，社交網(wǎng)站會使得孩子獲得自我滿足感，并且更加以自我為中心，所以會變得更加自私；故選C．
51．D．細節(jié)理解題．根據(jù)第二段But they will strike a chord （弦） with parents and teachers who complain that many teenagers lack the ability to communicate or concentrate away from their screens．可知，孩子過分的依賴于社交網(wǎng)站如Facebook等，會使他們脫離現(xiàn)實而迷失自我，只會在虛擬的網(wǎng)絡(luò)中沉迷；故選D．
52．C．推理判斷題．根據(jù)第三段中But while the sites are popular and extremely profitable，a growing number of psychologists and neuroscientists believe they may be doing more harm than good．可知，越來越多的心理學(xué)家和神經(jīng)系統(tǒng)科學(xué)家等都已經(jīng)意識到這一問題的嚴重性，引起了公眾的關(guān)注．所以C項正確．
53．B．寫作意圖題．通過對文章內(nèi)容的閱讀可知，本文主要的寫作意圖就是針對社交網(wǎng)絡(luò)帶給孩子的危害而提一些實質(zhì)性的建議，以期引起大家的更多關(guān)注；故選B．
54．C．推理判斷題．根據(jù)第四段中．""I often wonder whether real conversation in real time may eventually give way to these easier and faster screen dialogues，可知，他是在擔(dān)心現(xiàn)實社會中的一些對話場景是否會讓位給虛擬的世界，這是一個很令人關(guān)切的問題；故選C．
點評 考查學(xué)生的細節(jié)理解和推理判斷能力．做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確選擇．在做推理判斷題時不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進行合乎邏輯的推理判斷．
