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题目材料:

Which of the following, if true, would most strengthen the view held by Higgs?
  • ACotton could not be supplanted by other crops in the South in the years immediately following 1892.
  • BThe proportion of the southern African American population employed by the cotton industry remained steady in the period from 1892 to 1921.
  • CThe impact of the boll weevil on the southern cotton crop was exacerbated by poor weather conditions in the years 1892 to 1921.
  • DCotton-producing areas outside the American South escaped the ravages of the boll weevil until 1921.
  • EThe number of African Americans who moved to the North as part of the Great Migration peaked in 1910.

B显示答案

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