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题目材料:

The conservationists` recommendation as described is based on which of the following assumptions?
  • AThe capacity of any illegal channels that may exist for the sale of ivory in export markets cannot expand to meet demand in those markets
  • BThere now exist synthetic substitutes for ivory that are essentially indistinguishable from the natural product
  • CBans on imports of ivory need to be combined with intensified efforts to stop poaching in order to be effective
  • DTo the economies of those countries that have significant elephant herds, elephants are more valuable alive than dead
  • E In some parts of Africa where poaching has depleted elephant herds, those herds are already beyond recovery

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