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题目材料:

The author introduces statistics about North America`s non-indigenous plant species primarily in order to
  • A undermine a proposed explanation for the absence of any evidence for the occurrence of a particular phenomenon
  • Bcontrast the effect of introduced plant species in North America with the effect that introduced animal species have had
  • Csuggest that North America`s indigenous plants are a domain in which there has been ample scope for a particular effect to have occurred
  • Demphasize how much the ecology of North America has been affected over the past 400 years by the introduction of non-indigenous species
  • E substantiate a claim about the overall effect that the introduction of non-indigenous species tends to have on indigenous populations

E显示答案

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