题目内容
（请给出正确答案）
[单选题]
单子叶植物根茎类中药材横切面上通常可见的一圈环纹是（）。
A.木栓形成层
B.皮层中的纤维束环带
C.皮层中的石细胞环带
D.内皮层
E.形成层
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why did the couple refuse the Luck Fairy’s help？(1．5分)
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