哪种症状可用毛果芸香碱

A．胃肠绞痛

B．青光眼

C．术后腹气胀

D．重症肌无力

E．检查眼晶体屈光度

－I____it as must of a student that he should say hello to his teachers first whenever they meet.

－I can’t agree more.

A．take

B．look

C．think

D．make