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题目材料:

According to the passage, it is likely that during the mid-1700s, sea urchin populations near the Bering and Copper islands
  • Awere diminished by sea cow predation
  • Bexperienced substantial increases
  • Cmigrated to waters with more plentiful food supplies
  • Dwere reduced by the pressures of hunting
  • Eappeared to be malnourished

B显示答案

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以上解析由 考满分老师提供。

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