—Are these shoes yours?

—No, they are _________.[ ]

A. them

B. their

C. theirs

D. ours

伤寒沙门菌的鞭毛为（）

A.单端丛生鞭毛

B.两端丛生鞭毛

C.周身鞭毛

D.单鞭毛

E.双鞭毛