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(chǎn)，b，c，d           
B．c，a，b，d       
C．c，b，d，a          
D．b，c，d，a．

分析 本文屬于科教類的短文閱讀．主要講述的是醫(yī)生不斷探索如何給受傷的腦部做手術(shù)的事．針對腦部手術(shù)時間短這一現(xiàn)狀不同的專家想出了相應(yīng)的應(yīng)對辦法．

解答 29．A  細(xì)節(jié)理解題．根據(jù)第一段"It is difficult for doctors to help a person…．the brain lives for only three to five minutes"，可知對于腦部手術(shù)的難度在于時間短；故選A．
30．D  細(xì)節(jié)理解題．根據(jù)第二段"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，故選D．
31．A  細(xì)節(jié)理解題．根據(jù)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．可知把大腦冷卻可以延長手術(shù)的時間；故選A．
32．B  理判斷題．根據(jù)最后一段第三句至第九句可推知，首先要冷卻血液，然后將冷卻的血液輸送回大腦，再防止血液流入大腦，最后實施腦部手術(shù)；故選B．

點(diǎn)評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進(jìn)行合乎邏輯的推理判斷

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