单项选择题
The cork readily exfoliates from the lateral surfaces but persist．s between the branches．What part of the cork is unlikely to exfoliate（）
A．上表层 B．下表层 C．两分枝中间 D．分枝的表层 E．两边表层
A．皮，厚0.2-0.8mm B．呈复卷状 C．可由单卷重叠成复卷状 D．可由双卷重叠成复卷状 E．可呈片状