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54. (   )

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. 
  
  

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