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    14．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 30minutes．This gives the doctor a longer time to do something for the brain．
    Dr．White tried his idea on 13monkeys．First he taught them to do different jobs，and 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 30minutes 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．
    29．The biggest difficulty in operating on the damaged brain is thatA．
    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
    30．The brain operation was made possible mainly byD．
    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
    31．With Dr．White's new idea，the operation on the damaged brainA．
    A．can last as long as 30minutes
    B．can keep the brain's blood warm
    C．can keep the patient's brain healthy
    D．can help monkeys do different jobs
    32．What is the right order of the steps in the operation？B
    a．send the cooled blood back to the brain
    b．stop the blood to the brain
    c．have the blood cooled down
    d．operate on the brain
    A．a，b，c，d           
    B．c，a，b，d       
    C．c，b，d，a          
    D．b，c，d，a．

    分析 本文属于科教类的短文阅读．主要讲述的是医生不断探索如何给受伤的脑部做手术的事．针对脑部手术时间短这一现状不同的专家想出了相应的应对办法．

    解答 29．A  细节理解题．根据第一段"It is difficult for doctors to help a person…．the brain lives for only three to five minutes"，可知对于脑部手术的难度在于时间短；故选A．
    30．D  细节理解题．根据第二段"If it is very cold，the brain can live without blood for 30 minutes"可知大脑可以在温度很低的情况下存活三十分钟，故选D．
    31．A  细节理解题．根据第二段If it is very cold，the brain can live without blood for 30minutes．This gives the doctor a longer time to do something for the brain．可知把大脑冷却可以延长手术的时间；故选A．
    32．B  理判断题．根据最后一段第三句至第九句可推知，首先要冷却血液，然后将冷却的血液输送回大脑，再防止血液流入大脑，最后实施脑部手术；故选B．

    点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断

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