—With 3G mobile phones, people can even see each other as they talk.       

—Really? Would you show me        it, please?       [ ]

A. how to use    

B. when to use    

C. where to use    

D. what to use

溃疡不规则，底部污秽，凸凹不平，胃酸缺乏（）

A.癌性溃疡

B.十二指肠球后溃疡

C.复合溃疡

D.胃多发溃疡

E.幽门管溃疡