开展物质人为流动分析优先选择( )When carrying out a material anthropogenic flow analysis, priority should be given to ( )
A.
物质流动不受人类活动影响的物质 The material whose flow cannot be affected by human activity
B.
物质流动受人类活动影响较小的物质 The material whose flow is lightly affected by human activity
C.
物质流动受人类活动影响较大的物质 The material whose flow is strongly affected by human activity
D.
物质流动受人类活动与自然因素影响程度相当的物质 The material whose flow is affected by human activities to the same extent as natural forces