36. Which of the following is people' s natural response to pain? 

• A、They tend to feel worried and frightened.
  
  

• B、 They want to make sure it won't last long.
  
  

• C、They prefer to forget the bad memories. 
  
  

• D、They try to find out what may cause pain.

40. What is the main reason for Slberteien to practice recycling?

• A、To protect the environment.
  
  

• B、 To save more money.
  
  

• C、To obey the local rules.
  
  

• D、To follow his fellows.
  
  

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