Question

阅读理解 　　During the 19th century, scientists found that when certain parts of the brain of a person were hurt, he would lose the power of doing certain things．And so people thought that each part of the brain does a different job．But modern research discovered that this is not so, for it is not easy to show 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．Scientists have found out the way the brain works is not so simple as people in general may think．Chemists tell us that about 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 think of the thing that happens to us．We may not be able to think of the things we have heard and seen, but it is 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 grows 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 proved that 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． (1) In the 19th century, scientists found that a person would lose the power to do certain things ________． [　　] A． when he got weaker in health B． if certain parts of his brain were hurt C． after he did a quite different job D． when he grew older (2) Scientists today are still unable to show exactly ________． [　　] A． what each part of the brain is doing B． how many chemical changes take place in the brain each second C． whether each part of the brain does the same job D． which part of the brain is the most important (3) It has been found that one's brain usually works ________． [　　] A． faster when he is old B． a little now and a little then C． in a very simple way D． without any rest all day long

Answer 1

答案：1．B;2．A;3．D;
解析：

文章中作者曾提到这一事实：科学家已经发现大脑工作并非像人们普通认为的那样简单，其内每秒钟会发生10万种化学变化，而且大脑总是像储藏室一样，在不停地集存外界信息。所以，选择D项更有说服力。

提示：

(1)	文章叙述了19世纪科学家们的发现：如果人脑的某一部分受伤，那么，人们就会失去做某一件事的能力。
(2)	由原文But modern research discovered that this is not so, for it is not easy to show exactly what each part of the brain does．可知答案为A。