Here is an astonishing and significant fact:Mental work alone can't make us tire．It sounds absurd．But a few years ago.scientists tried to find out how long the human brain could labor without reachi 题目和参考答案——青夏教育精英家教网—

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13．Here is an astonishing and significant fact：Mental work alone can't make us tire．It  sounds absurd．But a few years ago，scientists tried to find out how long the human brain  could labor without reaching a stage of fatigue（疲劳）．To the amazement of these scientists，they discovered that blood passing through the brain，when it is active，shows no fatigue at all!If we took a drop of blood from a day laborer，we would find it full of fatigue toxins at and fatigue products．But if we took blood from the brain of an Albert Einstein，it would show no fatigue toxins at the end of the day．
So far as the brain is concerned，it can work as well and swiftly at the end of eight or  even twelve hours of effort as at the beginning．The brain is totally tireless．So what makes us tired？
Some scientists declare that most of our fatigue comes from our mental and emotional attitudes．One of England's most outstanding scientists，J．A．Hadfield，says，"The greater part of the fatigue from which we suffer is of mental origin．In fact，fatigue of purely physical origin is rare．"Dr．Brill，a famous American scientist，goes even further，He declares，"One hundred percent of the fatigue of sitting worker in good health is due to emotional problems．"
What kinds of emotions make sitting workers tired？Joy？Satisfaction？No!A feeling of being bored，anger，anxiety，tenseness，worry，a feeling of not being appreciated-those are the emotions that tire sitting workers．Hard work by itself seldom causes fatigue．We get tired because our emotions produce nervousness in the body．

24．What surprised the scientists a few years ago？C
A．Fatigue toxins could hardly be found in a laborer's blood．
B．Albert Einstein didn't feel worn after a day's work．
C．The brain could work for many hours without fatigue．
D．A mental worker's blood was filled with fatigue toxins．
25．According to the author，which of the following can make sitting workers tired？B
A．Challenging mental work
B．Unpleasant emotions
C．Endless tasks
D．Physical labor．
26．What's the author's attitude towards the scientists'idea？A
A．He agrees with them．    B．He doubts them．
C．He argues against them． D．He hesitates to accept them．
27．What do sitting workers need to do in order to stay energetic？B
A．Have some good food．    B．Enjoy their work．
C．Exercise regularly．     D．Discover fatigue toxins．

分析本文是一篇科教类阅读，主要揭露了一个最新的事实--脑力劳动是不会让我们感到疲劳的．

解答 24-27．CBAB
24题答案：C考查细节推理，根据第一段第四句"To the amazement of these scientists，they discovered that blood passing through the brain，when it is active，shows no fatigue at all!"可知，让科学家们感到惊讶的是，当流经大脑的血液是活跃的时候，大脑不会疲劳，即大脑就算工作很长时间也不会疲劳．故答案选C．
25题答案：B考查细节推理，根据最后一段倒数第三句"A feeling of being bored，anger，anxiety，tenseness，worry，a feeling of not being appreciated-those are the emotions that tire sitting workers．"可知，不愉快的情感会让脑力劳动者感到疲劳．故答案选B．
26题答案：A考查细节推理，文章第一段揭露了一个让人吃惊的事实；脑力劳动是不会让我们感到疲劳的，作者又通过一个科学实验验证这一事实的正确性，然后进一步分析让脑力劳动者感到疲劳的是一些不良情绪，并引用一些著名科学家的话进行论证．故答案选A．
27题答案：B考查细节推理，根据最后一段可知，脑力劳动者之所以感到疲劳是因为受工作中产生的一些不良情绪的影响．从中我们可以体会到，假如我们心态平和享受工作是不会产生这些不良情绪的，这样就不会感觉到疲劳．因此，要保持精力充沛，脑力劳动者应享受工作．故答案选B．

点评本文是一篇科教类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．

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