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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. 
  
  

41. According to the passage, some doctors believe it is true that (   ). 

• A、you are healthy if cold-water swimming turns your skin color blue
  
  

• B、cold-water swimming causes more heart attacks in summer than in winter
  
  

• C、cold-water swimming can make the body temperature dangerously high
  
  

• D、Polar Bears are bears swimming in freezing water
  
  

55. (   )