56

53. What can be inferred about people' S use of salt in the past?

• A、 People used salt to control blood pressure.
  
  

• B、People ate much salt in their average diet.
  
  

• C、People were clear about the harmful effect of salt.
  
  

• D、People didn't eat so much salt as we do today.
  
  

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.