During the 19th century, scientists found that when certain parts of the brain of a pe
1.In the 19th century, scientist 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、more complicated than we thought
4.Which of the following is NOT true according to the text?()
A、Scientists are working hard at the researches on the brain.
B、As many as six million chemical changes take place in the brain every minute.
C、A young man doing physical labor is sure to have a much slower min
D、Even an old man may have a quick mind if his brain is given much exercise.
5.The more work we give to our brains()
A、the less result we will gain
B、the more work they are able to do
C、the weaker their power will get
D、the more tired they will feel