题目内容

Children all undergo babbling, holophrastic, two-word, and the telegraphic speech stages of language development.()

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They may be happy because their work provides a lot of pleasure.()

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EDTA同阳离子结合生成

A. 整合物
B. 聚合物
C. 离子交换剂
D. 非化学计量的化合物
E. 水合物