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Agricultural societies cannot exist without staple crops. Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods. All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams. Therefore, discovering when rice and yams were introduced into western Africa would establish the earliest date at which agricultural societies could have arisen there.

Which of the following is an assumption on which the argument depends?

【选项】There are no plants native to western Africa that, if domesticated, could serve as staple food crops.

选项是否正确?

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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:GWD-85
  • 题目来源2:PREP2012-64
正确率:55%