Carbon monoxide, funned by the incomplete combustion of some carbonaceous material, has been a______to humans since the domestic

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问题 Carbon monoxide, funned by the incomplete combustion of some carbonaceous material, has been a______to humans since the domestication of fire.

选项 A、hazard
B、dispute
C、docile
D、boost

答案A

解析句意：由一些含碳材料的不充分燃烧产生的一氧化物，自从人类学会使用火以来对人类就是一个危险。hazard危险，有危险的事物。dispute争论，争吵。docile驯良的，温顺的。boost推进。

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