8．Here is an astonishing and significant fact：Mental work alone can't make us tired．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 （疲勞）．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（毒素） 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（情緒的） 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 a 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．
32．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 out 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．
33．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．
34．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．
35．We can infer from the passage that in order to stay energetic，sitting workers need toB．
A．have some good food．
B．enjoy their work
C．exercise regularly              
D．discover fatigue toxins．

分析 本文是一篇說明文閱讀，主要介紹了科學(xué)家們通過研究發(fā)現(xiàn)腦力勞動(dòng)并不能使人勞累，使人感到勞累的是人的精神和情感狀態(tài)，即厭煩、生氣、焦急、緊張、憂慮以及不被欣賞等消極的情緒，這些情緒能在體內(nèi)產(chǎn)生緊張感，使自己感覺到身體疲倦．

解答 32．C  細(xì)節(jié)理解題．根據(jù)第一段Here is an astonishing and significant fact：Mental work alone can't make us tire．可知腦力勞動(dòng)時(shí)間長了并不會(huì)讓人感覺到累，故選C．
33．B  細(xì)節(jié)理解題．根據(jù)最后一段A feeling of being bored，anger，anxiety，tenseness，worry，a feeling of not being appreciated---those are the emotions that tire sitting workers．可知厭煩、生氣、焦慮、緊張還有不高興的情感會(huì)使工人感到勞累，故選B．
34．A  態(tài)度判斷題．根據(jù)第一段Here is an astonishing and significant fact：Mental work alone can't make us tire．We get tired because our emotions produce nervousness in the body．可知我們感覺到累是因?yàn)槲覀兩眢w里產(chǎn)生了緊張的情緒，在這里可以看出作者是贊同這個(gè)觀點(diǎn)的，故選A．
35．B  推理判斷題．根據(jù)最后一段Hard work by itself seldom causes fatigue．We get tired because our emotions produce nervousness in the body．可知只要人們不覺得緊張，能享受生活，那么就能保持精力旺盛，而不會(huì)覺得累，故選B．

點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．

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