单项选择题

Smoking cigarettes adds to the general levels of air pollution as well as damaging our health.（）

A．吸烟危害健康、污染空气。
B．空气污染及吸烟危害了人的健康。
C．吸烟不仅对健康有害，而且增加空气污染程度。
D．吸烟增加空气污染的程度与吸烟危害人体健康的程度一样大。

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