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二、词汇与语法知识: 共15小题; 每题2分, 共30分。从每小题的四个选择项中, 选出最佳的一项。

6. If you smoke too often, your lungs will be even (   ). 

• A、good
  
  

• B、 worse
  
  

• C、poor
  
  

• D、well
  
  

50. Which of the following best describes the organization of this passage?

• A、An exercise and its importance are explained. 
  
  

• B、A problem is examined and solutions are given.
  
  

• C、Two different views of a problem are presented. 
  
  

• D、Recent developments in medicine are described. 
  
  

51. (    )