52. (    )

48. "Brain wave"machines may show (   ).

• A、the last one or two minutes of one's dream
  
  

• B、the story which lasts for hours or even days
  
  

• C、how long a dream lasts
  
  

• D、the explanations of one's dream
  
  

19. I'll do (   ) the guide said.

• A、as
  
  

• B、as if
  
  

• C、that
  
  

• D、all which