题目内容：
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A．Life of Microscopic Bacteria in Livestock’s Rumen B．Ways to Reduce Methane’s Heat-Trapping Power
C．Agriculture Also Contributes to Increased Concentrations of Methane in the Atmosphere
D．Why Livestock Releases Methane
E．Methane as a Strong Greenhouse Gas
F．Livestock as a Prime Factor of the Greenhouse Effect
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