9．It is difficult for doctors to help a person with a damaged brain．Without enough blood，the brain lives for only three to five minute．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．

28．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
29．The brain operation was made possible mainly byC．
A．taking the blood out of the brain
B．trying the operation on monkeys first
C．lowering the brain's temperature
D．having the blood go through a machine
30．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(chǎn)，b，c，d   B．c，a，b，d   C．c，b，d，a   D．b，c，d，a
31．With Dr．White's new idea，the operation on the damaged brainA．
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．

分析 本文是一篇人物故事類閱讀．文章主要講述的是醫(yī)生不斷探索如何給受傷的腦部做手術的事．針對腦部手術時間短這一現(xiàn)狀專家們想出了相應的應對辦法．

解答 28-31 ACBA
28．A．細節(jié)理解題．根據(jù)"It is difficult for doctors to help a person with a damaged brain．Without enough blood，the brain lives for only three to five minute．"可知腦部手術的難度在于它的時間必須很短．故選A．
29．C．細節(jié)理解題．根據(jù)"If it is very cold，the brain can live without blood for 30 minutes．"可知大腦可以在溫度很低的情況下存活三十分鐘．所以腦部手術通常在溫度較低的情況下進行．故選C．
30．B推理判斷題．由最后一段"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．"可知首先要冷卻血液，然后將冷卻的血液輸送回大腦，再防止血液流回大腦，最后實施腦部手術．故選B．
31．A．細節(jié)理解題．根據(jù)"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．"可知把大腦冷卻可以延長手術時間，使手術時間延長到三十分鐘．故選A．

點評 本文是一篇人物故事類閱讀．文章主要講述的是醫(yī)生不斷探索如何給受傷的腦部做手術的事．此類題型主要考查學生的細節(jié)理解和推理判斷能力．細節(jié)理解題是針對文中某個細節(jié)、某句話或某部分具體內(nèi)容設置問題，所以在做細節(jié)理解題時要結合原文和提干有針對性的找出相關語句進行仔細分析，再結合選項選出正確答案．在做推理判斷題時不要以個人的主觀想象代替文章的事實，要聯(lián)系上下文根據(jù)文章事實進行合乎邏輯的推理判斷．

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