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题目材料:

It can be inferred from the passage that the "existing research" found which of the following about animals` play behavior?
  • AMost animal species show significant sex differentiation when engaged in dyadic play.
  • BDominant animals often appear to adjust their behavior during play in order to encourage subordinate partners to play with them.
  • CLarger, more experienced animals generally maintain their hierarchical roles in relation to smaller, younger animals during dyadic play.
  • DFew animal species that engage in dyadic play adhere closely to the 50:50 rule during play encounters.
  • ESome animal species show much more asymmetry during dyadic play than other species do.

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