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  3. Fires need oxygen(氧气). Without oxygen they will die. Cover a fire with water, sand, or sometimes with your coat. (Passage 3 )

Fires need oxygen(氧气). Without oxygen they will die. Cover a fire with water, sand, or sometimes with your coat. (Passage 3 )

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问题 Fires need oxygen(氧气). Without oxygen they will die. Cover a fire with water, sand, or sometimes with your coat. (Passage 3 )
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答案火需要氧气。没有氧气火就要熄灭。用水，沙子，有时还要用衣服来盖住火(来灭火)。
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