Here is an astonishing and signficant fact:Mental work alone can’t make us tired. It sound

Here is an astonishing and signficant 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 could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered thett blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day labourer, we could find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of Albert Einstein, it would show no fatigue toxing 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 f efforts as at the beginning. The brain is totally tireless. So what makes us tired.
Some scientists declare that most of our fatigue come from our mental and emotional(情感的) 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?Satifaction?No!A feeling of being bored,anger,anxiety,tenseness,worry,a feeling of nt being appreciated---those are emotions that tire sitting workers.Hard work by itself seldom causes fatigue.We get tired because our emotions produce nervousness in the body.
【小题1】What surprised the scientists a few years ago?A．Fatigue toxinscould hardly be found in a labour’s blood.B．Albert Eistein didn’t feel worn out after a day’s work.C．The brain could wrk for many hours without fatigue.D．A mental worker’s blood was filled with fatigue toxins.【小题2】According to the authour,which of the following can make sitting worker tired？A．Challenge mental work.B．Unpleasant emotions.C．Endless tasks.D．Physical labor.【小题3】What’s the authour’s attitude towards the scientists’ ideas?A．He agrees with them.B．He doubts themC．He argues against them.D．He hesitates to accept them.【小题4】We can infer from the passage that in order to stay energic, sitting workers need to .A．have some good bloodB．enjoy their workC．exercise regularlyD．discover fatigue toxinC

(答案→)C 解析：【文章大意】本文是科普说明文。通过实验来证明什么让人们感到疲劳的。【小题1】根据文章的第一段中To the amazement of these scientists, they discovered thett blood passing through the brain, when it is active, shows no fatigue at all!进行理解。【小题2】根据文章的最后一段的第二句话进行判断。【小题3】根据文章的第一段第一句话和最后一段推断作者是科学家的观点的。【小题4】根据文章的最后一句话判断推理。

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