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  3. [originaltext] It is difficult for doctors to help a person with a damaged b

[originaltext] It is difficult for doctors to help a person with a damaged b

游客2024-04-27  24
问题  
It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can’t fix the damage. Sometimes they are afraid to try to do something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
    Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
    Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs. Then he operated on them. He made the monkeys’ blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys’ brains. When the brain’s temperature was 10℃, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After the operations the monkeys were all like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
Questions 20 to 22 are based on the passage you have just heard.
20. What is the biggest difficulty in operating on the damaged brain?
21. By mainly what was the brain operation made possible?
22. What do we learn about the operation on the damaged brain according to Dr. White’s new idea?
选项 A、By taking the blood out of the brain.
B、By lowering the brain’s temperature.
C、By trying the operation on monkeys first.
D、By having the blood go through a machine.
答案 B
解析 选项均以“By+doing”开头表明，本题考查行为方法。短文中提到，罗伯特·怀特博士找到了一种延长脑部存活时间的方法，即将脑部冷却(make the brain very cold)，冷却后的脑部在没有血液的状态下可存活三十分钟，这样医生就有时间做手术，故答案为B)。
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