平滑面菌斑中，丝状微生物排列呈栅栏状出现于菌斑的哪一层结构中（）

A.菌斑-牙界面

B.稠密微生物层

C.表膜下层

D.菌斑体部

E.菌斑表层

I’m _______ the Drawing Club. What about you?

A．the member

B．the member of

C．a member of

D．a member