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  3. Fires need oxygen(氧气). Without oxygen they will die. There is oxygen in the fire. Cover a fire with water, sand, or sometimes wi

Fires need oxygen(氧气). Without oxygen they will die. There is oxygen in the fire. Cover a fire with water, sand, or sometimes wi

admin2018-08-19  41
问题 Fires need oxygen(氧气). Without oxygen they will die. There is oxygen in the fire. Cover a fire with water, sand, or sometimes with your coat.
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答案火的燃烧需要有氧气。没有氧气，火就着不起来。有火就有氧气。用水、沙子或你的外套可以盖住火。
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