单选题：Nothing has been mentioned in the passage about __________.

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题目内容：
Nothing has been mentioned in the passage about __________. A．one of the major contributors
B．the ever-increasing atmospheric concentrations of greenhouse gases
C．big and hefty cows
D．livestock's normal digestion process
E．how to cut down the cattle populations
F．big industries and gas-guzzling vehicles
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The new system was found more effective in document search t

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