Many people believe we will face environ...

Many people believe we will face environmental disasters _________ we completely change the way we live.

A．but

B．though

C．unless

D．until

C 【解析】试题分析：but 但是；Though虽然，尽管；unless除非；until直到，常和not一起搭配使用。句意：除非我们改变我们的生活方式，很多人相信我们将要面对生态灾难。故选C。考点：连词辨析

考点分析：

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