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题目材料:

Which of this following, if true, would best support the plant permissive hypothesis?
  • AAphids that feed on different species of plants produce honeydew of varying quality.
  • BSeasonal changes in the quality of phloem sap are a common phenomenon in plants.
  • CMany aphid species with extremely maritimus honeydew are not attended by ants.
  • DSome species of aphids inhabit more than one species of plant.
  • EThe Rocky Mountain region and Central Europe have few plant species in common.

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