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55. (   )

42. The Polar Bears like to swim all the year round, for (   ). 

• A、they can remain young
  
  

• B、it is an easy way to keep the body warm in winter
  
  

• C、they find it enjoyable and interesting
  
  

• D、they might meet fewer troubles in life
  
  

12. The school has (   ) history of two (   ).

• A、/ ; hundred
  
  

• B、a; hundreds
  
  

• C、a ; hundred
  
  

• D、/; hundreds