— May I ask you a question after class, sir?

— ________,  but not during my lunch break. [ ]

A. Go ahead    

B. Sure

C. Anytime    

D. Sorry

发生青霉素过敏性休克时，临床常最早出现的症状是

A．烦躁不安、血压下降
B．四肢麻木、头晕眼花
C．意识丧失、尿便失禁
D．腹痛、腹泻
E．喉头水肿、呼吸道症状