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

• A、/ ; hundred
  
  

• B、a; hundreds
  
  

• C、a ; hundred
  
  

• D、/; hundreds
  
  

50. Which of the following best describes the organization of this passage?

• A、An exercise and its importance are explained. 
  
  

• B、A problem is examined and solutions are given.
  
  

• C、Two different views of a problem are presented. 
  
  

• D、Recent developments in medicine are described. 
  
  

53. (    )