52. (    )

44. The book that first called public attention to Dickens was (   ) .

• A、The Pickwick Papers
  
  

• B、Oliver Twist
  
  

• C、Tale of Two Cities
  
  

• D、David Copperfield
  
  

40. What does the passage talk about?

• A、Warfare is a"law of nature". 
  
  

• B、Warfare is not a"law of nature". 
  
  

• C、Warfare controls human population. 
  
  

• D、None of the lowlier animals, except ants, practice warfare upon their own species.