Many people believe we are heading for an environmental disaster(灾难)______we radically (根本地) change the way we live.

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问题 Many people believe we are heading for an environmental disaster(灾难)______we radically (根本地) change the way we live.

选项 A、but
B、though
C、unless
D、in case

答案C

解析 句意为“很多人认为,除非我们从根本上改变生活方式,否则我们将面临 巨大的环境灾难”。unless有“否则,如果不”之意,所以选C。
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