单项选择题

There is no question that impure air is a health problem of great and increasing importance．

A) 不洁空气正在严重地而且越来越严重地威胁着人们的健康，这是毫无疑问的。
B) 毫无疑问，空气污染对人们的健康具有很大的危害，而且这种危害越来越严重。
C) 不洁空气对健康产生着越来越严重的威胁的问题是不存在的。
D) 空气污染极大地危害了人们的健康，这引起人们越来越多的重视。
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