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Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.

Abefore Bas

Cunless Din case

 

C

【解析】C 考察连词。Before之前;as因为,由于;unless除非,如果不;in case万一,假使;句义:科学家警告说如果碳排放不下降,我们会面临环境灾难。根据句义和逻辑关系可知C正确。

 

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