单选题:玉米、甘蔗、竹子等植物的茎不能无限加粗的原因是茎内(  )。

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题目内容:

玉米、甘蔗、竹子等植物的茎不能无限加粗的原因是茎内(  )。 A.有大量薄壁细胞存在
B.没有韧皮部
C.没有形成层
D.没有木质部

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