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The Malbec grape, originally grown in France, has become the main varietal in Argentina. This is surprising because most Malbec grown in Argentina is grown at high altitudes, whereas the Malbec grape once was grown at low altitudes. Therefore, Argentinian winegrowers should grow the Malbec grape at low elevations.

Which of the following, if true, would most weaken the conclusion of the argument?
  • AThe Bordeaux grape is the most popular grape in France but is rarely, if ever, grown in Argentina. 分析该选项
  • BSome varietals are unable to grow at high altitudes. 分析该选项
  • CThe soil at high altitudes is filled with nutrients that help many of Argentina`s varietals flourish. 分析该选项
  • DThe Malbec vine is susceptible to phylloxera, a plant louse that only grows at low altitudes. 分析该选项
  • EMalbec has recently enjoyed a surge in popularity, and can be found in many different countries. 分析该选项
正确答案: D

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