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54. (   )

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
  
  

47. What is the main subject of the passage?

• A、How to beat a bad mood. 
  
  

• B、How to talk bad moods out. 
  
  

• C、How to do physical exercises. 
  
  

• D、How to do aerobic exercise.