单项选择题

12．发育的主要形态标志是(　　)。

A．A．细胞、组织、器官体积增加
B．B．组织功能的完善
C．C．细胞、组织的分化
D．D．心理、智力的发展
E．E．形态、功能已全面达成人水平

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单项选择题

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