1．Many people think it is safe to use a cell phone while they are driving．Yet Scores of studies suggest that real multitaskers-those who can carry out multiple （多個的） tasks equally well，make up just 2 percent of the population．More surprisingly，the so-called"supertaskers"actually have differently structured brains to the other 98 percent．
The brain areas that make supertaskers differ from the rest of the population are the same parts that are most different between humans and nonhuman primates （靈長類），according to David Strayer，director of the applied cognition lab at the University of Utah．Scientists are unsure of the reason why some brains are different．In fact，we could all benefit from doing just one task at once．
In most of us，scientists have located a"bottleneck in the brain"that may explain why we find it hard to do two things at once．
The problem appears to be caused by a logjam of nerve messages．Faced with two almost simultaneous （同時的） tasks less than 300 milliseconds apart，the brain's ability to deal with the second one slows down．The neural （神經(jīng)的） response to the second task was postponed until the response to the first was completed．This means that with e-mails，phone calls，text messages and online social media all competing for our attention，often against a background of television，radio or music，our brains can reach information overload．
Scientists made the discovery after scanning the brains of volunteers attempting to multitask on a computer．The task was deliberately designed to involve the use of different senses and motorresponses．
Dr Rene Marois，one of the neuroscientists who carried out the experiment at Vanderbilt University in Nashville，Tennessee，said："Our research offers neurological evidence that the brain cannot effectively do two things at once．"The next step，the neuroscientists say，is finding out"why these areas cannot process two tasks at once．"
66．How many people can drive equally well while using a cell phone？C
A．Nobody．B．Everybody．C.2 in 100．D.98 in 100．
67．The researchers tried to find out the difference betweenBbrain structures．
A．different supertaskers'
B．supertaskers'and ordinary people's
C．humans'and nonhuman primates'
D．supertaskers'and nonhuman primates'
68．We can infer from the article that the brain takes 300 milliseconds toA．
A．make a neural response               B．get ready for a response
C．complete a task                      D．finish two tasks
69．If weD，our brains may reach information overload．
A．serf the Internet after listening to music
B．use a cell phone against a background of television
C．complete all kinds of tasks within the same day
D．have lots of tasks queuing for responses
70．From the dictionary explanations，choose one for the underlined word"motor"in Paragraph 5．C
A．having an engine
B．relating to vehicles with engines
C．relating to nerves that make muscles move （control body movement）
D．the part of a machine that makes it move．

分析 本文是一篇科普說明文．文章主要講述了大多數(shù)人都不能在同一時間內(nèi)完成兩件甚至多件事情，只有極少數(shù)人可以做到同時完成多件事情，這樣的人被稱為"超級任務(wù)者"．本文分析了多數(shù)人不能同時完成兩件甚至多件事情的原因，并試圖找出"超級任務(wù)者"與普通人在大腦結(jié)構(gòu)上的不同．

解答 CBADC
66．C　細(xì)節(jié)理解題．根據(jù)文章第一段第二句"…those who can carry out multiple （多個的） tasks equally well，make up just 2 per cent of the population．"可知，答案選C．
67．B　推理判斷題．根據(jù)文章第一段最后一句"More surprisingly，the socalled‘supertaskers'actullay have differently structured brains to the other 98 percent．"并結(jié)合全文內(nèi)容可知，研究者們試圖找出超級任務(wù)者和普通人在大腦結(jié)構(gòu)上的不同．
68．A  推理判斷題．根據(jù)文章第四段第二、三句"Faced with two almost simultaneous （神經(jīng)的） tasks less than 300 milliseconds apart…The neural （神經(jīng)的） response to the second task was postponed until the response to the first was completed．"可知，大腦需要300毫秒的時間來作出神經(jīng)反應(yīng)．
69．D　細(xì)節(jié)理解題．根據(jù)文章第四段最后一句"This means that with emails…our brains can reach information overload．"可知，如果我們有很多的任務(wù)需要回復(fù)，我們的大腦就會達(dá)到信息超載．
70．C  詞義猜測題．根據(jù)文章第五段畫線單詞所在句子并結(jié)合全文內(nèi)容可知，畫線單詞motor應(yīng)該是有關(guān)控制肌肉運動的神經(jīng)．

點評 1、要想做好科普英語閱讀理解題，同學(xué)們就要注意平時多讀科普知識類文章，學(xué)習(xí)科普知識，積累常見的科普詞匯，從根本上提高科普英語的閱讀能力．
2、要熟悉科普類文章的結(jié)構(gòu)特點．科普類文章一般由標(biāo)題（Head line），導(dǎo)語（Introduction），背景（Back ground），主體（Main body）和結(jié)尾（End）五部分構(gòu)成．標(biāo)題是文章中心思想高度而又精辟的概括，但根據(jù)歷年的高考情況來看，這類閱讀理解材料一般不給標(biāo)題，而要同學(xué)們選擇標(biāo)題．導(dǎo)語一般位于整篇文章的首段．背景交待一個事實的起因．主體則對導(dǎo)語概括的事實進(jìn)行詳細(xì)敘述，這一部分命題往往最多，因此，閱讀時，同學(xué)們要把這部分作為重點．結(jié)尾往往也是中心思想的概括，并與導(dǎo)語相呼應(yīng)，命題者常在此要設(shè)計一道推理判斷題．　　
3、在進(jìn)行推理判斷時，同學(xué)們一定要以閱讀材料所提供的科學(xué)事實為依據(jù)，同時所得出的結(jié)論還應(yīng)符合基本的科普常識．

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D．influence one's intelligence greatly
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I called him and introduced myself．He was in an agreeable mood at the beginning，but as soon as I began to question him，his attitude changed．"What happened in Vietnam？"I asked．There was a moment of silence on the other line，and then he said he was willing to tell me about Vietnam．
He said that he was drafted when he was 20years old and that the two years later he spent there a part of his life he would rather forget．He said，"The problem is that you will never imagine how much suffering and pain I saw in that place．"There is not one book or article that can really describe the human disaster that took place there．There is nothing worse in this world than killing a man who you know has a family．It is very sad，but it is the truth，and it turns more complex when you realize you were part of that truth．
When I returned to Puerto Rico，it was a total disaster：young kids without fathers，wives without husbands．Most of those who made it back have no legs，like me，or no arms．I was praised because of my bravery，but for me，that was and is pure nonsense，because that war decided my future，decided the future of my family．I，now，am just a veteran who has nothing．
The thing that bothers me the most is that the people who decided to fight will probably never know that it is likely to kill a man，or feel pain and suffering from hunger and the absence of love．In war，every minute you are fearing because the only thing you have in your mind is that if you don't kill first you are going to get killed．

66．Why did the author's mother say"Those things are only memories"？C
A．Because she would rather keep what happened in the past as a secret．
B．Because her cousin is no longer a vigorous young man．
C．Because though her cousin was a good runner，he lost his leg during the war．
D．Because time passed quickly and she can't remember much of the past days．
67．Which of the following statements is TRUE according to the 4th paragraph？D
A．Books and articles all presented a false picture of the war．
B．It takes mental strength to survive the war．
C．The sufferings during the war greatly damaged the memory of soldiers，
D．The author's uncle felt very painful when he realized the truth of the war．
68．Why did the author's uncle find the praises"pure nonsense"？B
A．Because praises came too late．
B．Because no praise could make up for his loss．
C．Because he didn't kill anyone during the war．
D．Because too many praises seemed worthless．
69．What can we infer from the last paragraph？C
A．Those who decide to fight should take part in the war by themselves．
B．The veterans could stand any hardship in their life after the war．
C．Those who made the war should be severely blamed．
D．Firing first is the best policy on the battlefield．

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