# 题目内容

The author introduces statistics about North Americas 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 Americas 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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