8. Chinese teaching is not only (   ) art but also as (   ) science. 

• A、 the; the
  
  

• B、an; /
  
  

• C、an; a
  
  

• D、the; a
  
  

52. (    )

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