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题目材料:

The primary purpose of the passage is to
  • Aexpose the fragile nature of the foundations on which the high yields of modern agriculture rest
  • Bargue that genetic engineering promises to lead to even higher yields than are achievable with synthetic fertilizers
  • Cargue that the capacity for nitrogen- fixing symbioses is transferable to nonleguminous plants
  • Dexplain the reasons for and the objectives of current research on nitrogen-fixing symbioses
  • Edescribe the nature of the genes that regulated they symbiosis between legumes and certain bacteria

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