My pen pal Peter came to Beijing 3 months ago. There days he  小题1: (learn) Chinese in a language school. He likes travelling. And he  小题2:  already      (visit) many great places of interest in our country. Next month, he  小题3:  (fly) to Harbin for the summer vocation. I am sure he will have a good time.

长期用于抗癫痫治疗时会引起牙龈增生的药物是（）

A.苯巴比妥

B.扑米酮

C.三甲双酮

D.苯妥英钠

E.乙琥胺