51. (    )

43. The passage is mainly about (   ). 

• A、a group of cold-water-swimming lovers
  
  

• B、the Polar Bears' life in New York
  
  

• C、doctors' ideas about cold-water swimming
  
  

• D、the requirements of the Polar Bear Club
  
  

16. The concert has already begun. You should have come a little bit (   ). 

• A、early
  
  

• B、much earlier
  
  

• C、more earlier
  
  

• D、earlier