It is difficult for doctors to help a person with a damaged brain.Without enough

It is difficult for doctors to help a personwith a damaged brain.Without enough blood,the brain lives for only three tofive minutes.More often the doctors can’t fix the damage.Sometimes they areafraid to try something to help because it is dangerous to work on thebrain.The doctors might make the person worse if he operates on the brain.

Dr. Robert White,a famous professor anddoctor,thinks he knows a way to help.He thinks doctors should make the brainvery 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 13 monkeys.Firsthe taught them to do different jobs,then he operated on them.He made themonkeys’ blood go through a machine.The machine cooled the blood.Then themachine sent the blood back to the monkeys’ brains.When the brain’s temperaturewas 10℃.Dr. White stopped the blood to thebrain.After 30 minutes he turned the blood back on.He warmed the bloodagain.After their operations the monkeys were like they had been before.Theywere healthy and busy.Each one could still do the jobs the doctor had taughtthem.

1.The biggest difficulty in operating on thedamaged 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 possiblemainly 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 onthe 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 inthe operation?

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

试题答案

【答案】

1.A

解析:这是一道推断题。根据第一段“Withoutenough blood,the brain lives for only three to five minutes. More often thedoctors can’t fix the damage.”可知大脑损伤手术的最大难度在于大脑缺血后生存的时间只有3~5分钟,没有足够手术时间。

2.D

解析:这是一道推断题。根据第二段“Hethinks doctors should make the brain very cold. If it is very cold,the braincan live without blood for 30 minutes.”可以推断出通过降低大脑温度可以延长大脑存活时间,使得手术成为可能。

3.A

解析:这是一道推断题。根据第二段“Hethinks doctors should make the brain very cold. If it is very cold,the braincan live without blood for 30 minutes.”可以推断出大脑损伤手术时间可以延长到30分钟。

4.B

解析:这是一道排序题。根据最后一段Dr.White利用猴子做试验的顺序,应该是先把血液降温,然后把降温后的血液输入大脑,然后切断大脑血液做手术。