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题目材料:

The passage suggests that biologists who say egg production in birds is biologically highly costly would agree that clutch size is determined primarily by
  • AThe nutritional and energy demands of egg production.
  • BThe number of young that the parents can rear successfully.
  • CReproductive limitations operating during chick rearing.
  • DThe availability of food for newly hatched chicks.
  • EThe differences between altricial and precocial species.

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