2. 金融经济
  3. Many people believe we are heading for an environmental disaster (灾难) ______ ...

Many people believe we are heading for an environmental disaster (灾难) ______ ...

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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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