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题目材料:

Which of the following, if true, would most clearly undermine the conclusion that the author makes based on the 1984 survey?
  • AAreas south of the Yangtze basin currently have less wild-rice habitat than they once did.
  • BSurveys since 1984 have shown wild rice populations along the upper Yangtze as well as along the middle and lower Yangtze.
  • CThe populations of wild rice along the Yangtze represent strains of wild rice that migrated to the north relatively recently.
  • DEarly rice-farming societies along the Yangtze were not as highly developed as archaeologists once thought.
  • EIn East Asia, the historical geographic range of wild rice was more extensive than the present-day geographic range is.

C显示答案

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