18. _____the result of the exam, she stood at the door of the classroom，disappointed.

• A、Knowing
  
  

• B、To be known

• C、Known

• D、To know

60

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.