As a film star she was a success, but as a wife she was _____ failure, so their marriage ended in _____ failure. [ ]

A. /; /

B. /; a

C. a; a

D. a; /

百日咳杆菌是经哪种途径感染的（）

A.呼吸道感染

B.消化道感染

C.创伤感染

D.接触感染

E.多途径感染