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题目材料:

Which of the following, if true, most strengthens the argument?
  • AMature monarch butterflies do not feed on parts of milkweed that contain glycosides.
  • BThe glycosides in milkweed sap are slightly toxic to caterpillars of other species.

  • CThe vast majority of the monarch butterflies that are laying eggs in a given region will have traveled there from a single region.
  • DThere are substances other than glycosides in milkweed sap that accumulate in a monarch caterpillar and are retained in the body of the mature butterfly.

  • EThere are certain glycosides that are found in the sap of all milkweeds, no matter where they grow within the monarch butterfly`s range.

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