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.
63. The biggest difficulty in operating on the damaged brain is that _______.
A. the damage is extremely hard to fix
B. the patients are often too nervous
C. the time is too short for doctors
D. the blood-cooling machine might break down
64. The brain operation was made possible mainly by _______.
A. taking the blood out of the brain
B. lowering the brain’s temperature
C. having the blood go through a machine
D. trying the operation on monkeys first
65. With Dr. White’s new idea, the operation on the damaged brain _______.
A. can help monkeys do different jobs
B. can keep the brain’s blood warm
C. can keep the patient’s brain healthy
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