完形填空。
     Scientists are trying to make the desert into good land again. They want to bring    1     to the desert,  
so people can live and grow food.  They are    2    a lot about the desert. But    3    of the earth is
becoming desert all the time, scientists may not be able to    4    . the deserts. Scientists think that
people make deserts.  People are doing    5    things to the earth. 
     Some places on the earth don't get    6   .  But they still don't become deserts. This is _7  _ some
green plants are growing there.  Small green plants and grass are very    8    to dry places. Plants don't
let the wind blow the earth away. When   9  _ bit of rain falls,  the plants hold the water.   10   plants,  
the land can become a desert much more easily.
(     )1. A. food            
(     )2. A. learning        
(     )3. A. fewer and fewer  
(     )4. A. use              
(     )5. A. good            
(     )6. A. little rain      
(     )7. A. because          
(     )8. A. careful          
(     )9. A. a little        
(     )10. A. With            		 B. water        
B. writing      
B. less and less
B. change      
B. better      
B. much warm    
B. for          
B. helpful      
B. a few        
B. Without      		 C. money          
C. buying        
C. more and more
C. lose          
C. bad            
C. much rain      
C. as            
C. forgetful      
C. a lot        
C. For            
1-5 BACBC   6-10 CABAB
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