He is too young to go to school, he ? [ ]
A. is
B. was
C. isn't
D. wasn't
答案：A
临床常用治疗痄腮的灸法是（）
A.隔姜灸
B.隔蒜灸
C.温针灸
D.灯火灸
E.化脓灸
硝苯地平属于下列哪一类抗心绞痛药物
A．硝酸酯类B．β受体阻断药C．钙通道阻断药D．钠通道阻断药E．亚硝酸酯
