生物体是一个有机的整体，构成生物体各个结构也是非常严密的．如

生物体是一个有机的整体，构成生物体各个结构也是非常严密的．如图有关各结构的关系的图示，表述正确的是（　　）

A．

B．

C．

D．

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生物体是一个有机的整体，构成生物体各个结构也是非常严密的．如

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