64
A. stomach
B. head
C. heart
D. mind
65
A. up
B. off
C. in
D. down
61
A. use
B. inform
C. ask
D. teach
What is the beneficial point of some microbes consuming plant-produced methane？
A. Methane becomes less poisonous
B. Methane is turned into a fertilizer
C. Less methane reaches the atmosphere
D. Air becomes cleaner
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