【题目】The harmful effects that smog can have on people's health are one of the top ______ of those who live in some cities.
A.concernsB.conflicts
C.charactersD.charges
在线课程【答案】A
【解析】
考查名词辨析。句意：雾霾对人们健康的危害是一些城市居民最关心的问题之一。A. concerns关心的事、担心；B. conflicts冲突；C. characters性格；D. charges费用。根据“The harmful effects that smog can have on people's health”可知此处表示“关心的事”，故A项正确。