英语三级B级

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

参考答案：B进入在线模考
本题答案：B—A—D—C。there is no question that意思是“毫无疑问，…”；impure air字面意思是“不洁空气”，但生活中我们常用的说法是“空气污染”，因此翻译为后者更加合适：of a health problem of great and increasing importance意思是说“对人们的健康有很大危害，并且这种危害越来越严重”。

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