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(疲勞). 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.
【小題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.
【小題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.
【小題3】What’s the authour’s attitude towards the scientists’ ideas?
A．He agrees with them.
B．He doubts them
C．He argues against them.
D．He hesitates to accept them.
【小題4】We can infer from the passage that in order to stay energic, sitting workers need to ______.
A．have some good blood
B．enjoy their work
C．exercise regularly
D．discover fatigue toxin


【小題1】C
【小題2】B
【小題3】A
【小題4】B

解析【文章大意】本文是科普說明文。通過實驗來證明什么讓人們感到疲勞的。
【小題1】根據(jù)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!進行理解。
【小題2】根據(jù)文章的最后一段的第二句話進行判斷。
【小題3】根據(jù)文章的第一段第一句話和最后一段推斷作者是科學家的觀點的。
【小題4】根據(jù)文章的最后一句話判斷推理。

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