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37. What can be inferred about taking painkillers from Paragraph 2?

• A、It leads to addiction in a short period of time.

• B、It builds up the tolerance to pain.

• C、 It becomes less effective over time. 

• D、 It cures stomach and liver diseases slowly.

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47. Where is the passage most probably taken from?

• A、A novel.
  
  

• B、 A tourist guide.
  
  

• C、. A product catalog.
  
  

• D、A biography.