What is the main aim of the human-made wetlands represented in this diagram?
(A) growing biomass
(B) recreational areas
(C) reducing greenhouse gasses
(D) wastewater treatment
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統計: A(2), B(1), C(0), D(9), E(0) #2137003
統計: A(2), B(1), C(0), D(9), E(0) #2137003