题目内容

All his colleagues were stunned by the ____(drama) change in his appearance and manner.

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We did not notice the ____(severe) of the earthquake until the inside story was publicized.

反应过程中无活性中间体生成的反应类型是（）

A. 自由基反应
B. 周环反应
C. 离子反应

请解释什么是氢键，并说明氢键的两个特点。

请解释什么是分子结构。