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题目材料:

The challenge referred to in the highlighted material pertains primarily to which of the following?
  • A.When maize was first introduced into northern latitudes
  • B.What caused maize to proliferate in northern latitudes
  • C.Whether maize became the primary food crop in northern latitudes after A.D,900
  • D.Whether maize became well established in northern latitudes prior to A.D.900
  • E.When farmers in northern latitudes first began to crossbreed different varieties of maize

B显示答案

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