— Are you going to school            bus? 

— No, we are going            mother's car. [ ]

A. by, by

B. by, in

C. in, at

可使新生儿出现灰婴综合征的药物是

A．氯霉素
B．新生霉素
C．磺胺嘧啶
D．葡萄糖
E．苯巴比妥