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问题

下列有关物质循环叙述正确的是( )

A.物质循环包括碳循环、磷循环、水循环、氮循环等

B.各物质循环是相互独立的

C.物质循环与能量循环无关

D.物质循环对生态系统中的生物无任何影响

参考答案
正确答案:A
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