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    完形填空。
         We have always been warned of the dangers of forest fires. They cause  1  to a forest.
    They kill many plants and animals in an eco-system, which is a group of living things and their environment.
    But have you ever heard of a forest fire that can be  2  for a forest? People start some of the fires
    with a special reason to actually do good to the eco-system. In fact, fires are a natural part of any eco-system.
    Without fires, the oldest and largest trees would stop sunlight from reaching the forest floor. Fires can  3   
    some of these old trees. When the trees die, they provide something good for the earth. New trees can grow
    strong and healthy in their place.
         Some trees even need fires to grow. These trees hold their seeds (种子) inside. Heat from a fire allows the
    coat of the seeds to open up. Then the seeds fall to the ground and have the  4  to grow/ Scientist, who know
    about nature's needs, start some of these fires, called controlled burns. A fire is started and kept under control.
    This way, the fire does not spread out of the area or  5  a after forest fires, they can go hungry  6  their food
    has been damaged in the fire. Small, controlled fires mean than animals will not have to move far to find food.
    After some time, small plants begin to grow. Animals return soon after the plants return. 
         This  7  makes an eco-system. So the next time you hear about a forest fire, think about the good as well
    as the bad. It may take a new eco-system a while to return, but it will likely come back stronger and healthier
    than ever.
    (     )1. A. illness         
    (     )2. A. helpful         
    (     )3. A. take the place of
    (     )4. A. time            
    (     )5. A. discover        
    (     )6. A. because         
    (     )7. A. almost               		B. difficulty   
    B. powerful     
    B.  get ready for
    B. water        
    B. cover        
    B. although     
    B. again             		C. damage   
    C. harmful  
    C. be bad for
    C. chance   
    C. but      
    C. but      
    C. never         		D. flood    
    D. awful    
    D. get rid of
    D. skill    
    D. waste    
    D. so       
    D. even     
    1-7      CADCBCB
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