Nowadays it is a well-known fact that second hand smoking does even more harm to human health.

A. 二手烟对人类健康危害十分巨大，这在今天已经是无可争辩的事实。

B. 二手烟对人类健康的危害甚至更大，这在今天已是众所周知的事实。

C. 今天大家都知道这样一个事实，二手烟对人类的危害已是不容置疑。

D. 今天广为传播的说法已被证实，二手烟对人类的危害并非有意夸大。

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