---The air pollution is terrible. --- It...

---The air pollution is terrible.

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

A. if B. unless C. so D. though

B 【解析】试题分析：句意：--空气污染是糟糕的。--除非我们采取行动保护环境否则会更糟糕。A. if如果；B. unless 除非，如果不；C. so 所以；D. though 尽管。根据句意，故选B。考点：考查连词的用法。

考点分析：

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