图是菜豆种子的部分结构示意图，①②③④表示不同的结构，其中贮

图是菜豆种子的部分结构示意图，①②③④表示不同的结构，其中贮藏营养物质、能发育成幼根的结构分别是（）

A．③① B．④① C．①② D．②③

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