题目内容：

It’s difficult for doctors to help a person with a hurt brain.     enough blood, the brain can live only 3 to 5 minutes. Usually doctors can’t fix the hurt     such a short time.

Dr Robert White thinks he knows a     of help. He thinks doctors should make the hurt brain   to live for 30 minutes without blood. This gives the doctor     time to do something for the brain. Dr White experimented his      on fifteen monkeys.     he taught them to do different jobs. Then he operated on them. He made the monkeys’ blood go     a machine. When the brains’   was 10℃,he stopped the blood to the brain. After 30 minutes, he turned the blood back on. He     the blood again. After their operations, the monkeys were almost     before. They were healthy and busy. Each one could still do the job the doctor     them.

Dr White’s idea works well on monkeys. He thinks it will work on     . He thinks it will help with heart problems. A person     die when his heart stops; doctors can     it again. The problem comes: when the brain is without blood for about 5 minutes, it     . If doctors start the heart again after 5 minutes, the person has     body but a dead brain. Maybe in the future, doctors will     Dr White’s idea. When the person’s heart stops, the doctor will     cool the brain. They will have 30 minutes to start the heart again. Maybe there will be no     the brain.

1.A. Don’t have    B. WithoutC. Having not   D. Only with

2.A. for    B. afterC. inD. since

3.A. wayB. brainC. doctorD. man

4.A. too  coolB. enough coolC. cool enoughD. very

5.A. a longer   B. enoughC. a shorterD. another

6.A. medicine   B. mannersC. ideaD. brain

7.A. Besides   B. InsteadC. HoweverD. First

8.A. to   B. acrossC. throughD. onto

9.A. heat   B. temperatureC. coolnessD. feeling

10.A. cooled   B. operatedC. warmedD. stopped

11.A. the same as   B. different fromC. used toD. cleverer than

12.A. was taught B. was teachingC. was to teachD. had taught

13.A. other people  B. human beingsC. other things    D. more people

14.A. doesn’t have to B. needn’tC. will be able toD. is afraid to

15.A. start  B. takeC. makeD. begin

16.A. loses  B. goesC. killsD. dies

17.A. no  B. a deadC. a livingD. a lively

18.A. get  B. acceptC. keepD. try

19.A. soon  B. quicklyC. slowly   D. rapid

20.A. use for  B. wrong withC. value toD. problem with