选择题：AU of the following adaptations of living things are mentioned in the passage ex

题目内容：

AU of the following adaptations of living things are mentioned in the passage except that in their______.

A. structure

B. ways to develop the survival skills of the young

C. production of the young

D. working system of the body

参考答案：【答案仅供学习，请勿对照自行用药等】

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