_云南成考网

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. 
  
  

11. Mistakes don't just happen; they occur for a reason. Find out the reason and then making the mistake becomes (   ). 

• A、favourable
  
  

• B、precious
  
  

• C、essential
  
  

• D、worthwhile
  
  

55. (    )