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—The air pollution is terrible.

— It will be worse ________ we take action to protect the environment.

A. if B. unless C. until D. When

B

【解析】

試題分析：句意：—空氣污染很嚴重。 —情況將會更加嚴重，除非我們采取措施來保護環(huán)境。A. if如果； B. unless除非，如果不；C. until直到……才；D. when當……的時候。句意和詞意結(jié)合可知，選B。

考點：考查連詞的用法。

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