_广西成考网

53. (    ) 

13. I (   ) have handed in the report, but I (   ) not find the materials. 

• A、should; would
  
  

• B、should; could
  
  

• C、might; would
  
  

• D、would; could
  
  

40. The main idea of this passage is (   ).

• A、warfare is a "law of nature"
  
  

• B、warfare is not a "law of nature"
  
  

• C、warfare does not control human population
  
  

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