42. What does the"law of nature"mean? You can find the answer in the passage in (   ) . 

• A、the second sentence
  
  

• B、the fifth sentence
  
  

• C、the seventh sentence
  
  

• D、the forth sentence
  
  

51. (     ) 

41. According to the passage, which of the following is TRUE?

• A、The destruction is similar to the killing of each other within human beings. 
  
  

• B、There is the similar destruction now, but it didn't occur before.
  
  

• C、There is never a time when we may see the similar destruction. 
  
  

• D、The destruction is now a thing of the past.