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

• A、 the; the
  
  

• B、an; /
  
  

• C、an; a
  
  

• D、the; a
  
  

31. (   )

• A、harder
  
  

• B、stronger
  
  

• C、higher
  
  

• D、quicker
  
  

51. (    )