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单选题
The four basic components of a fire are chain reaction, heat, fuel, and （）.
A
carbon monoxide
B
oxygen
C
carbon dioxide
D
any gaseous substance
参考答案
参考解析
解析：
reaction：反应；carbon:碳；monoxide：一氧化碳；dioxide：二氧化物；gase-ous:气态的【译文】：产生火灾的4个基本条件为可燃物(燃油)、助燃物(氧气)、火源(热量)和链反应。
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