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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. And so, people thought that each part of the brain did a difficult job. But modern research has found 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 our 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. Some recent research also suggests that we can remember everything that happens to us. We may not be able to recall some of the things we've heard and seen, but they are all kept in the storehouse of the human mind.
Earlier chemists thought that power of a person's brain got weaker as he grew older. But it is now thought that that is not true. As long as old person has always been active in the mind, he has a quicker mind than a young person who has only done physical work without using much of his brain. It is now thought that the more work we give our brains, the more work they are able to do.
1.________ scientists found that when certain parts of the brain of a man were injured, he would lose the power to do certain things.
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|
A.1800 years ago |
B.1900 years ago |
|
C.100 years ago |
D.More than 90 years ago |
2.For half a century people ________.
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A.have been studying how the brain works
B.had been studying how the brain works
C.have been studying how the brain worked
D.had been studying how the brain worked
3.The scientists ________ show us exactly what each part of the brain does.
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A.were able to |
B.are able to |
| C.are now unable to | D.will not be able to |
4.________ we give our brains, ________ our brains act.
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A.The more work, the slower
B.The less work, the quicker
C.The more work, the quicker
D.The more work, the quick
5.Chemists tell us that 100 000 chemical changes take place in the brain every ________.
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|
A.half a minute |
B.one second |
|
C.one-sixty minute |
D.one-sixtieth minute |