完形填空      At the beginning of this century, medical scientists made an interesting discovery: we are built not just of
flesh and blood but also of time. They were
     __ 1__ to show that we all have 6"a body clock"    2__  us. which controls the    3_   and fall of our
body energies,    4_  us different from one day to the next.
     The    5 _ 0f "a body clock" should not be too   6 _ since the lives of most living things are controlled 
  7   the 24-hour night-and-day cycle. We feel     8  and fall asleep at night and become    9__ and
energetic during the day.lf the
     24-hour-cycle is  _10 , most people experience unpleasant    11 .For example, people who are not    12
to working at night can find that   13__ of sleep causes them to   14 _ badly at work.
         15 the daily cycle of sleeping and    16 , we also have other cycles which    17  longer than one day.
Most of us would    18 that we feel good on some days and not so good on    19  ; sometimes our ideas
seem to flow and at other times, they _20__ do not exist. (     )  1. A. anxious    
(     )  2. A.inside      
(     )  3. A. movement    
(     )  4 A. showing    
(     )  5. A. invention  
(     )  6. A. difficult  
(     )  7. A. from        
(     )  8. A. dull        
(     )  9. A. regular     
(     )10. A. disturbed  
(     )11. A. moments    
(     )12. A. prevented  
(     )13. A. miss        
(     )14. A. perform    
(     )15. A. With        
(     )16. A. working    
(     )17. A. repeat      
(     )18. A. agree      
(     )19. A. other      
(     )20. A.just         B. able      
B. around    
B. supply    
B. treating  
B. opinion    
B. exciting  
B. by        
B. tired      
B. excited    
B. shortened  
B. feelings  
B. allowed    
B. none      
B. show      
B. As well as
B. moving    
B. remain    
B. believe    
B. the other  
B. only       C. careful    
C. between    
C. use        
C. making      
C. story      
C. surprising  
C. over        
C. dreamy      
C. lively      
C. rested      
C. senses      
C. expected    
C. lack        
C. manage      
C. Except      
C.living      
C. last        
C. realize    
C. all other  
C. still       D. proud          
D. on            
D. rise          
D. changing      
D. idea          
D. interesting    
D. During        
D. peaceful      
D. clear          
D. troubled      
D. effects        
D. used          
D. need          
D. control        
D. Rather than    
D. waking        
D. happen        
D. allow          
D. others        
D. yet