问题补充：
It’s essential for citizens to know that the haze(雾霾.can do harm people’s health.
A. with
B. for
C. on
D. to
答案：
A. with
B. for
C. on
(答案→)D. to
解析：
试题分析: 句意：很有必要让市民们了解雾霾对人们健康的危害。do harm to对某事物有危害，固定短语，故选D.
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