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(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 as people in general may think. Chemists tell us that 100,000 chemical changes take place in the brain every, second. () 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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【单选题】27() A.every B.each C.all D.different

A.
In the United States the most popular form of folk dancing since the early days has been square dancing. In early times, when men and women worked in groups to (21) a barn(谷仓) for harvest crops, they danced when the work was done. The music (22) from a violin for the most part. But if there was no one to play an instrument(乐器), clapping(击掌) was used to (23) the rhythm(节奏) by which to dance. The early settlers(移民) danced in a store, in a barn, or in a farm kitchen.
B.
After some years (24) , square dancing became (25) popular in cities and towns, but it (26) popular in the country. Then it became popular in the cities once again. Today in (27) parts of the United States you will find some school, club, or other group that is square dancing for fun.
C.
A square is formed by four couples(对,双) who stand (28) the center of the square. Each couple stands on one (29) of the square, the boy on the left and the girl on the right.
D.
The "caller" is an important part of the (30) since he tells the dancers which steps to do. If the dancers do not know the steps, he teaches them. It (31) time to learn to be good caller, and good callers are always in demand.
E.
Large or small groups of people can dance at one time. Sometimes 800 or 1,000 people may be dancing at the (32) time. Or there may be only one square of (33) people.
F.
Costumes(服装) are worn by some who square dance. This (34) the dancing more colorful to watch. The costumes vary(不同) from place to place. Women often wear full skirts of various colors with pretty blouse(罩衫). Men may have colored skirts and western trousers which they wear (35) when square dancing