【題目】Many people believe we are heading for environmental disaster _________ we basically change the way we live.

A. but B. although

C. unless D. Once

【答案】C

【解析】句意：很多人認(rèn)為我們正朝著環(huán)境災(zāi)難走去，除非我們從根本上改變生活方式。unless = if. . . not意為“如果不，除非”，只有C符合題意。

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