单项选择题
物质的人为流动主要用于( )What do anthropogenic flows serve for is ( )
A、满足人类需要 To meet the human needsB、满足生态服务功能 To meet the ecological service function
C、稳定地球地表结构 To stabilize the earth"s surface structure
D、稳定物质化学结构 To stabilize the material chemical structure
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