Methane, which has long been counted among the greenhouse gases that are implicated in global warming, comes both from natural sources such as bogs and from a host of human sources, including coal mines, leaking pipelines, landfills, and rice paddies.
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Athat are implicated in global warming, comes both from
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Bthat are implicated in global warming, coming from both
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Cbeing implicated in global warming, comes from both
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Dimplicated in global warming and coming both from
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Eimplicated in global warming, that come both from
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正确答案: A