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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 考察連詞。Before之前;as因為,由于;unless除非,如果不;in case萬一,假使;句義:科學(xué)家警告說如果碳排放不下降,我們會面臨環(huán)境災(zāi)難。根據(jù)句義和邏輯關(guān)系可知C正確。

 

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