选择题:一些单子叶植物根的表皮分裂成多层细胞且木栓化形成( )。A.复表皮B.次生表皮C.次生皮层D.根被

题目内容:

一些单子叶植物根的表皮分裂成多层细胞且木栓化形成( )。
A.复表皮
B.次生表皮
C.次生皮层
D.根被
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