我们把一日三餐中的包子、米饭、面条等称为主食，这是因为它们是

我们把一日三餐中的包子、米饭、面条等称为主食，这是因为它们是我们所需能量的

主要来源，这些食物中含有的营养成分主要是 ( )

A．淀粉 B．脂肪 C．维生素 D．蛋白质

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我们把一日三餐中的包子、米饭、面条等称为主食，这是因为它们是

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