53. (    )

50. Which of the following best describes the organization of this passage?

• A、An exercise and its importance are explained. 
  
  

• B、A problem is examined and solutions are given.
  
  

• C、Two different views of a problem are presented. 
  
  

• D、Recent developments in medicine are described. 
  
  

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

• A、 the; the
  
  

• B、an; /
  
  

• C、an; a
  
  

• D、the; a