减少肝性脑病患者肠道有毒物质的产生，首选的抗菌药物是（）.
A.青霉素
B.氯霉素
C.新霉素
D.磺胺嘧啶
E.黄连素
参考答案：C
—I'm terribly sorry, Lucy．I've left your notebook at home．
—_____? I reminded you last night．
A．So what
B．Why not
C．How come
D．What if
