某有机物在氧气中充分燃烧生成的水蒸气和二氧化碳的物质的量之比为1:1，由此可得出的结论是（ ）
A．该有机物分子中C、H、O原子个数比是1：2：3
B．分子中C、H原子个数比为1：2
C．该有机物中一定含有氧元素
D．该有机物中一定不含氧元素
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