齿状线（）。

A．是黏膜与皮肤的分界线

B．是直肠盆部与肛门部的分界线

C．是肛门内外括约肌的分界处

D．为平滑肌，不受意志支配

E．为骨骼肌，受意志支配，可以随意括约肛门，控制排便

---Has he returned the books you lent him?  

---He returned one book last week and promised to bring _____________ on Wednesday.  [ ]

A. others

B. other

C. another

D. the others