18. This new model of car is so expensive that it is (   ) the reach of those with average incomes. 

• A、over
  
  

• B、within
  
  

• C、beyond
  
  

• D、below
  
  

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
  
  

53. (    )