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六级阅读

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2012年6月英语六级阅读每日一练(5.17)

 47.If the drug proves effective in human trials,it could enhance the effectiveness of existing AIDS drugs in___________________.
  48.What has become standard cocktail therapy?
  49.While integrase deletes an immune cell’s genetic material and replaces it with its own,it acts like_____________in a word processor.
  50.Why would anti-AIDS drugs stop working?
  51.According to Steven Young,if scientists get the data that_______,they would petition for fast track status.

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