【单选题】
A <{p}><{font _mstmutation="1" _msthash="20489" _msttexthash="29395808"}>一氧化碳和水蒸气<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20490" _msttexthash="5737758"}>甲烷<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20491" _msttexthash="12996139"}>丙烷、丁烷<{/font}><{br/}><{/p}>
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