According to the speaker, what is the feature of air pollutants？A．Its contents often remai

According to the speaker, what is the feature of air pollutants？

A．Its contents often remain stable.

B．Its definition will change over time.

C．Air pollutants are natural.

D．Air pollutants are man-made.

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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