_阜陽成考網

51.(      )

17. The park is to a city (   ) the lung is to man' s body. 

• A、as
  
  

• B、that
  
  

• C、which
  
  

• D、what
  
  

46. We'd better have our meals (   ). 

• A、at the same time each day
  
  

• B、when our work is over
  
  

• C、when the meal is not hot
  
  

• D、when everyone is at home