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45. Which of the following is close to the word"aided"?

• A、Demanded.
  
  

• B、Helped.
  
  

• C、Caught. 
  
  

• D、Protected. 
  
  

42. The Polar Bears like to swim all the year round, for (   ). 

• A、they can remain young
  
  

• B、it is an easy way to keep the body warm in winter
  
  

• C、they find it enjoyable and interesting
  
  

• D、they might meet fewer troubles in life
  
  

54. (   )