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

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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