聽(tīng)下面一段材料，回答第1-4題。

1. What did the 19th century scientists think?
A. Different part of the brain functions differently
B. It is not easy to say what is not so simple as people may think
C. The way the brain works is not so simple as people may think.

2. How many chemical changes take place in the brain?
A. 10,000 every second.    
B. 6,000,000 every minute .  
C. 100,000 every hour.

3. How can the brain keep its power?
A. To increase the amount of research done on the brain.
B. To say exactly what each part of the brain does.
C. To give the brain plenty of exercise.

4. Which of the following statements is true?
A. We can remember everything that happens to us.
B. The power of one’s brain gets weaker as one grows older.
C. We should use our brain less so that it can work better.
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