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题目材料:

The passage`s reference to "geologic forces" serves to indicate a mechanism by which
  • Arivers might have deposited large numbers of fern spores in the Arctic Ocean
  • Bfreshwater lagoons might have formed close to the Arctic Ocean
  • Cthe temperature of the Arctic Ocean might have risen
  • Dwater from other oceans might have become mixed with that of the Arctic Ocean
  • Ethe Arctic Ocean might have become a suitable environment for ferns to grow in

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以上解析由 考满分老师提供。

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