营养学专家建议我国青少年要多吃奶、蛋、鱼,肉等含蛋白质丰富的

营养学专家建议我国青少年要多吃奶、蛋、鱼,肉等含蛋白质丰富的食品,因为蛋白质是(  
A
、体生长发育必需的物质       B主要供能物质

C、容易消化的物质              D、有机物。

答案

A

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