问题 选择题

食物的营养成分中,必须经过消化才能吸收的一组物质是(  )

A.水、无机盐、维生素

B.蛋白质、糖类、脂肪

C.蛋白质、维生素

D.维生素、糖类、脂肪、水

答案

食物中含有六大类营养物质:蛋白质、淀粉、脂肪、维生素、水和无机盐,每一类营养物质都是人体所必需的.脂肪、淀粉和蛋白质都是大分子的不溶于水的物质,不能被消化道壁直接吸收,它们只有在消化道内被消化为甘油、脂肪酸、葡萄糖和氨基酸等小分子的物质后才能被吸收.水、无机盐、维生素是小分子的物质,不要消化就可以被人体直接吸收.

故选:B

单项选择题 A1/A2型题
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