In many places in China, ____ bicycle is still ____ popular means of transportation. [ ]

A. a; the

B. /; a

C. the; a

D. the; the

持有车票的旅客在车站候车期间发生急病所需的治疗费用，由（）负担。

A.旅客自己

B.铁路部门

C.民政部门

D.地方有关部门