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【简答题】
芹菜、柑橘、玉米、甘薯等食物中含有的细丝是一种______、是指除______外的复杂糖类．包括______、______等．原来它们都是植物______主要组成成分．它的作用是能够促进______和______．还可以降低人体内的______和______等．被称为“______营养素”．
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