When it______air pollution, Wuhan faces the three"C"s, cars, coal and construction, which lead to its severe air pollution.

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问题 When it______air pollution, Wuhan faces the three"C"s, cars, coal and construction, which lead to its severe air pollution.

选项 A、refers to
B、comes to
C、happens to
D、speaks to

答案B

解析 本题考查动词短语的近义辨析。“refers to”意为“提及,提到”;“comes to”意为“谈到,涉及”,且符合“when it comes to”这个惯用搭配;“happens to”意为“碰巧”;“speaks to”意为“跟……讲话”。结合句意“当谈到武汉的空气污染时”,故选B项。
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