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【单选题】
小肠是消化食物的主要场所,下列哪一项与小肠的消化功能无关?( )A.
小肠内有多种消化液
B.
小肠绒毛壁由一层上皮细胞构成
C.
小肠内表面有许多环形皱襞和小肠绒毛
D.
小肠长5～6m
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