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48. It can be inferred from the passage that (   ). 

• A、when one is in a bad mood, he or she may not work very well
  
  

• B、the best way to overcome a bad mood is to talk to oneself
  
  

• C、some drugs are more effective than physical exercises
  
  

• D、taking drugs is at the risk of being poisonous
  
  

40. Doctors (   ). 

• A、encourage people to take part in cold-water swimming actively
  
  

• B、point out the possible danger of blood illness during cold-water swimming
  
  

• C、believe swimming is helpful both in winter and in summer
  
  

• D、have different ideas about the medical effects of cold-water swimming
  
  

55. (   )