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 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°C, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
1.The biggest difficulty in operating on the damaged brain is that _______.
A. the time is too short for doctors
B. the patients are often too nervous
C. the damage is extremely hard to fix
D. the blood-cooling machine might break down
2.The brain operation was made possible mainly by _______.
A. taking the blood out of the brain
B. trying the operation on monkeys first
C. having the blood go through a machine
D. lowering the brain' s temperature
3.With Dr. White's new idea, the operation on the damaged brain _______.
A. can last as long as 30 minutes
B. can keep the brain' s blood warm
C. can keep the patient' s brain healthy
D. can help monkeys do different jobs
4.What is the right order of the steps in the operation?
a. send the cooled blood back to the brainb. stop the blood to the brain
c. have the blood cooled downd. operate on the brain
A. a,b,c,d B. c,a,b,d C. c, b, d, a D. b, c, d, a
1.A
2.D
3.A
4.B
【解析】
试题分析：文章大意：大脑手术对医生来说很难，因为没有了供血，大脑只能存活三到五分钟。Dr. Robert White通过在猴子身上的实验，给医生提供了一个好办法。冷却大脑，这样大脑在没有供血的情况下就能存活半个小时，医生就能有更多的时间手术了。
1.A 细节理解题。根据第一段Without enough blood, the brain lives for only three to five minutes. More often the doctors can't fix the damage.可知答案选A。
2.D 细节理解题。 根据文章第二段… make the brain very cold…the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.可知，主要通过冷却大脑的方式医生进行大脑手术。答案选D。
3.A 细节理解题。根据第三段…the brain can live without blood for 30 minutes.很容易得出答案选A。
4.细节理解题。根据最后一段The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain's temperature was 10°C, Dr. White stopped the blood to the brain. … After their operations the monkeys were like they had been before.可以正确排序，手术的步骤为B。
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