单选题：关于卵泡的结构，哪项是不恰当的 （　　）

题目内容：
关于卵泡的结构，哪项是不恰当的 （　　） A．由卵母细胞和颗粒细胞构成基本结构
B．生长卵泡时期有颗粒层和卵丘形成
C．结缔组织分化形成卵泡膜
D．卵泡腔形成发生在次级卵泡阶段
E．透明带出现在原始卵泡
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