[单项选择]

During the 9th century scientists found that when certain parts of the brain of a man were (36) , he would lose the (37) to do certain things. And so, people thought that each part of the brain does a different (38) . But modern research has (39) out that this is not so, for it is not (40) to say (41) what each part of the brain does.
In the past fifty years there (42) a great increase in the amount of research (43) on the brain. Chemists and biologists have (44) that the (45) the brain works it is not so (46) as people in general may think. Chemists tell us that 100,000 chemical changes (47) in the brain every second. Some recent researches also (48) that we can remember everything (49) happens (50) us. We (51) not be able to recall (回忆) the things we’ve heard and seen, but it is all kept there in the storehouse of the human mind.

A. clear
B. clearly
C. troublesome
D. easy

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