37. What is the meaning of the word"about"similar to?

• A、At most.
  
  

• B、At least.
  
  

• C、Only. 
  
  

• D、Around.
  
  

41. According to the passage, some doctors believe it is true that (   ). 

• A、you are healthy if cold-water swimming turns your skin color blue
  
  

• B、cold-water swimming causes more heart attacks in summer than in winter
  
  

• C、cold-water swimming can make the body temperature dangerously high
  
  

• D、Polar Bears are bears swimming in freezing water
  
  

52. (    )