— What color _________ Mary's shoes?

— _________ black.[ ]

A. are; They're

B. is; They're

C. is; It is

D. do; They're

肛裂“三联征”是指（）。

A．疼痛、便秘、出血

B．肛裂、出血、前哨痔

C．疼痛、出血、前哨痔

D．肛裂、前哨痔、肛 * * 肥大

E．便秘、出血、前哨痔