完形填空。      It"s difficult for doctors to help a person with a hurt brain.    1  enough blood, the brain can live only
three to five minutes. Usually doctors can"t fix the hurt    2  such a short time.
     Dr Robert White thinks he knows a    3  of help. He thinks doctors should make the hurt brain    4  to
live for 30 minutes without blood. This gives the doctor    5 time to do something for the brain. Dr White
experimented his    6 on fifteen monkeys.    7   he taught them to do different jobs. Then he operated on
them. He made the monkeys" blood go    8  a machine. When the brains"    9  was 10℃, he stopped the
blood to the brain. After 30 minutes, he turned the blood back on. He   10  the blood again. After their
operations, the monkeys were almost    11  before. They were healthy and busy. Each one could still do
the job the doctor    12  them.
     Dr White"s idea works well on monkeys. He thinks it will work on   13 . He think it will help with heart problems. A person   14    die when his heart stops; doctors can   15  it again. The problem comes: when
the brain is without blood for about 5 minutes, it   16 . If doctors start the heart again after 5 minutes, the
person has    17  body but a dead brain. Maybe in the future, doctors will   18   Dr White"s idea. When
the person"s heart stops the doctor will   19   cool the brain. They will have 30 minutes to start the heart
again. Maybe there will be no   20 the brain. (     )1. A. Don"t have      
(     )2. A. for            
(     )3. A. way            
(     )4. A. too cool        
(     )5. A. a longer        
(     )6. A. medicine        
(     )7. A. Besides        
(     )8. A. to              
(     )9. A. heat            
(     )10. A. cooled        
(     )11. A. the same as    
(     )12. A. was taught    
(     )13. A. other people  
(     )14. A. doesn"t have to
(     )15. A. start          
(     )16. A. loses          
(     )17. A. no            
(     )18. A. get            
(     )19. A. soon           B. Without        
B. after          
B. brain          
B. enough cool    
B. enough        
B. manners        
B. Instead        
B. across        
B. temperature    
B. operated      
B. different from
B. was teaching  
B. human beings  
B. needn"t        
B. take          
B. goes          
B. a dead        
B. accept        
B. quickly         C. Having not      
C. in              
C. doctor          
C. cool enough    
C. a shorter      
C. idea            
C. However        
C. through        
C. coolness        
C. warmed          
C. used to        
C. was to teach    
C. other things    
C. will be able to
C. make            
C. kills          
C. a living        
C. keep            
C. slowly           D. Only with    
D. since        
D. man          
D. that cool    
D. another      
D. brain        
D. First        
D. onto          
D. feeling      
D. stopped      
D. cleverer than
D. had taught    
D. more people  
D. is afraid to  
D. begin        
D. dies          
D. a lively      
D. try          
D. rapid