当我们打开汽水或啤酒瓶时,会看到有气体冒出,这种气体是    (

当我们打开汽水或啤酒瓶时,会看到有气体冒出,这种气体是    (    )

A.水蒸气        B.二氧化碳      C.氧气        D.氢气

答案

B

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