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39. The word"which"refers to (   ).

• A、their ability
  
  

• B、reading vocabulary
  
  

• C、idiomatic expression
  
  

• D、learn process
  
  

43. When Johnson said he had an injection in his neck each evening, he really meant that (   ).

• A、he drank a glass of whisky in the evening
  
  

• B、he needed an injection in the neck
  
  

• C、a daily injection in the evening would make him sleep well
  
  

• D、there was something wrong with his neck
  
  

52. (     )