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题目材料:

Which of the following does the author present as generally the most cost-effective way of meeting demand for water for irrigation?
  • AReducing the amount of water consumed by large cities
  • BTreating wastewater that is currently being dumped
  • CIncreasing the efficiency of current irrigation systems
  • DHaving new wells drilled
  • EIncreasing the efficiency of current wastewater treatment projects

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