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55. What is the passage mainly about?

• A、 Sal and food flavor.
  
  

• B、Salt and people' 8 lifestyle.
  
  

• C、 Salt and food processing.
  
  

• D、Salt and people' s health.
  
  

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.