It's a serious problem．We can't decide ________ Mr Harris comes back．

[　　]

A．while

B．since

C．until

D．so

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科目：初中英語 來源：同步題 題型：完形填空

完形填空。    
     The most well-known effect of weather    1    mood is a medical condition called Seasonal Affective
Disorder (SAD for short).People who    2    from SAD get very   3     and depressed during the winter
months. Actually it is    4   to do with the weather-more because during the winter, days are very    5    
and people don't see so much day light(especially if they spend most of the day in a school room or of
fice!). Of course, the further North of the equator you live, the   6 _    the days during winter and the
more   7     you are to have symptom of SAD.
     When you are   8     to sunlight, your body makes lots of Vitamin D3, and because of that you make
more of a substance called Serotonin  ( pronounced Ser- ah - TONE- in).Serotonin is a chemical   9     
in the brain and it's very   10    to your mood. We know that if you don't have enough of it then you can
become depressed-antidepressant drugs like Prozac work because they    11    the amount of serotonin
  12    to the brain. Scientists think that some people aren't so   13  _ at making their own serotonin, and
need more sunlight than other people to do it properly. These are the people who suffer from SAD
during the winter,
 14     they just can't get enough sunlight ouring the short days to make all the serotonin they need to 
  15     happy. This is probably down to their genes.
(     )1. A. to        
(     )2. A. get        
(     )3. A. tired      
(     )4. A.many        
(     )5. A.long        
(     )6. A. shorter    
(     )7. A. possibility
(     )8. A. closed    
(     )9. A. found      
(     )10. A. necessary
(     )11. A.cause      
(     )12. A. way      
(     )13. A. good      
(     )14. A. so        
(     )15. A. become    		 B. on      
B. come    
B. sad      
B. much    
B. short    
B. longer  
B. chance  
B. exposed  
B. invented
B. useful  
B. improve  
B. available
B. best    
B. but      
B. feel     		C. of        
C. suffer    
C. excited    
C. few        
C. cold      
C. smaller    
C. opportunity
C. explored  
C. discovered
C. important  
C. produce    
C. key        
C. better    
C. and        
C. stay       		D. in          
D. get away    
D. disappointed
D. less        
D. warm        
D. more        
D. likely      
D. exposing    
D. made        
D. valuable    
D. increase    
D. point        
D. skillful    
D. because      
D. turn        

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