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题目材料:

The author of the passage mentions "tiny bones from fish" primarily in order to
  • Aexplain why traces of passenger pigeon are rare at Cahokian sites
  • Bsupport a claim about the wide variety of animal proteins in the Cahokian diet
  • Cprovide evidence that confirms a theory about the extinction of the passenger pigeon
  • Dcast doubt on the conclusion reached by the archaeologists who conducted the studies discussed in the passage
  • Ecounter an objection to an interpretation of the data obtained from Cahokian sites

E显示答案

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