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48. Why did the writer want to have a canoe trip with her boyfriend?

• A、To wait for a proposal of marriage.
  
  

• B、 To prove she was tougher than her boyfriend.
  
  

• C、 To show she had basic life skills.
  
  

• D、 To prove her ability to meet challenges.
  
  

52. What is the main reason for reducing salt in food?

• A、To improve the flavor of food.
  
  

• B、To decrease the time for processing food.
  
  

• C、To extend the shelf-life of food.
  
  

• D、 To protect people against heart diseases.
  
  

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