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    3．Parents who feel disappointed at their teenagers'failure to pay attention in class，and inability to sit quietly long enough to finish homework or plan ahead，should take solace．Their children are not being lazy or careless，according to new research．
        The research has found that teenagers'brains continue developing far longer into adulthood than we used to think．Teens may look like young adults but their brain structure is similar to that of much younger children．
    "It is not always easy for teens to pay attention in class without letting their minds wander，or to ignore distractions from their younger brothers or sisters when trying to solve a maths   problem，"said Dr Iroise Dumon-theil．"But it's not the fault of teenagers that they can't pay attention and are easily distracted．It's to do with the structure of their brains．Teens simply can't think as well as an adult．"
        The research showed that the brain of a teenager works less effectively than that of an adult．"We knew that the front of the brain of teens functioned in a chaotic  （混乱的） way but we  didn't realize it continued until the late 20s or early 30s，"said Dr Sarah-Jayne Blakemore，who led the research．
        Chaotic thought patterns are a result of teenagers'brains containing too much grey matter-the cell bodies and connections which carry messages within the brain．As we age，the amount of grey matter in our brain reduces．
    "What our research has shown is that there is simply too much going on in the brains of teens，"said Blakemore．"The result is that their brain energy and resources are wasted and their decision-making process is badly influenced．Adults，on the other hand，have less grey matter．This means that the brain works far more effectively．"
    63．The underlined word"solace"in Paragraph 1 may meanC．
    A．notice      B．medicine    C．comfort     D．action
    64．When making decisions，A．
    A．teens'brains continue to do much needless work
    B．the grey matter in young children's front brain becomes active
    C．people are not likely to be distracted until their late 30s
    D．adults are more independent than teens
    65．What is the effect of having too much grey matter？D
    A．It makes us always feel disappointed．
    B．It makes us more intelligent．
    C．It had a bad effect on the growth of teens．
    D．It had a bad effect on decision-making．
    66．What's the text mainly about？C
    A．Teens have different brains from those of children．
    B．Adults work more effectively than teens．
    C．Grey matter makes teens unable to pay attention．
    D．Brain energy is wasted in the brain's activity．

    分析 本文主要分析的就是青少年不能集中注意力的原因--大脑中的灰质层太多，影响了人们的正常思维．

    解答 CADC
    63  C 推理题．根据下句Their children are not being lazy or careless，according to new research．说明他们孩子表现不好，这不是因为孩子懒或者粗心．这让那些父母感觉有所安慰，故C正确．
    64   A 细节题．根据第三段前3行"It is not always easy for teens to pay attention in class without letting their minds wander，or to ignore distractions from their younger brothers or sisters when trying to solve a maths   problem，"说明孩子的脑海中会有很多其它的东西在干扰，故A项内容正确．
    65   D 推理题．根据倒数第二段1，2行Chaotic thought patterns are a result of teenagers'brains containing too much grey matter-the cell bodies and connections which carry messages within the brain．说明大脑中的灰质太多会影响我们的思维和决定，故D项正确．
    66   C 主旨大意题．本文主要分析的就是青少年不能集中注意力的原因--大脑中的灰质层太多，影响了人们的正常思维．故C正确．

    点评 做阅读理解时要快速的浏览全文，把握文章主旨大意，带着问题回到原文，寻找细节或概括相应的答案，最后要理清作者写作思路．

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    科目：高中英语 来源： 题型：阅读理解

    13．US scientists have performed an important reversal（逆转） of the ageing process in animal studies．They used a chemical to rejuvenate（使年轻） muscle in mice and said it was the equivalent（等同于） of transforming a 60-year-old's muscle to that of a 20-year-old-but muscle strength did not improve．Their study，in the journal Cell，identified an entirely new mechanism（原理） of ageing and then reversed it．Other researchers said it was an"exciting finding"．
    Ageing is considered a one-way street，but now researchers at Harvard Medical School have shown that some aspects can be reversed．Their research focused on a chemical called NAD．Its levels naturally drop in all cells of the body with age．The team showed this damaged the function of the cell's in-built power-stations，leading to lower energy production and ageing．
    Experiments showed that increasing NAD levels，by giving mice a chemical which they naturally change into NAD，could reverse the sands of time．One week of youth-medication in two-year-old mice meant their muscles became similar to those of a six-month-old．
    Dr Ana Gomes，from the department of genetics at Harvard Medical School，said："We believe this is quite an important finding．"She argues muscle strength may return with a longer course of treatment．However，this could never be a cure-all for ageing．Other aspects such as shortening of telomeres or damage to DNA would not be reversed．
    Dr Gomes told the BBC："Ageing is multi-factorial，it's not just one component（成分） we can fix，so it's hard to target the whole thing．I believe there is a lot of cross-talk in cells and energy is very important in a cell and likely to be a very big component of ageing that might cause some of the other things that happen with ageing．"
    68．From paragraph 1 we learn thatD．
    A．bones can be transformed
    B．muscle strength can be transformed
    C．color can be transformed
    D．muscle can be transformed
    69．From paragraph 2 and paragraph 3 we learn thatC
    A．researchers think ageing is a one-way street．
    B．NAD levels'dropping could make mice become younger．
    C．increasing NAD levels could make mice become younger．
    D．researchers think any aspect can be reversed．
    70．Dr Gomes will agree thatB
    A．we can target everything about ageing．
    B．muscle strength may return over a longer course of treatment．
    C．ageing could be cured．
    D．energy is of little importance in a cell．

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