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  3. (61) During the 19th century scientists found that when certain parts of the brain of a man were injured, he would lose the powe

(61) During the 19th century scientists found that when certain parts of the brain of a man were injured, he would lose the powe

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问题 (61) During the 19th century scientists found that when certain parts of the brain of a man were injured, he would lose the power to do certain things. (62) And so, people thought that each part of the brain does a different job. (63) But modem research has found out that this is not so, for it is not easy to say exactly what each part of the brain does.
   In the past fifty years there has been a great increase in the amount of research done on the brain, Chemists and biologists have discovered that the way the brain works is not so simple as people in general may think. Chemists tell us that 100,000 chemical changes take place in the brain every, second. (64) Some recent researches also suggest that we can remember EVERYTHING that happens to us. We may not be able to recall the things we’ve heard and seen, but it is all kept there in the storehouse of the human mind.
   Earlier scientists thought that the power of one’s brain got weaker and weaker as one grew older. But it is now thought that that is not true. As long as the brain is given plenty of exercise it keeps its power. It has been established an old person who has always been active in the mind has a quicker mind than a young person who has only done physical work without using much of his brain. (65) It is now. thought that the more work we give our brains, the more work they are able to.  
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答案因此，人们认为大脑的每—部分做着不同的工作。
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