下图中甲、乙分别表示人体不同体液间的物质交换和生态系统的碳

 下图中甲、乙分别表示人体不同体液间的物质交换和生态系统的碳循环过程,下列说法正确的是

①乙中的d为分解者,a为生产者

②人体过敏反应时,甲中的c增加引起水肿

③甲中d处的CO2浓度最高    

④甲中d为细胞内液、b为淋巴

⑤甲中的abc构成内环境;

⑥乙中有3条食物链,其中b所处营养级贮存的能量最少

A.③④⑤      B.①②③④⑤⑥       C.①③④⑤          D.①②⑥

答案

A

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