我国经济社会发展的（）是科学发展观形成的现实依据。
A.阶段性特征
B.经济基础
C.实践经验
D.理论基础
参考答案：A
It was the third time that I _____ to Beijing. [ ]
A. have been
B. had been
C. was
D. been
抗癫痫药物治疗用药的原则是
A．大剂量、突击、静脉用药
B．按发作类型短期用药，随时改变品种
C．按发作类型长期、规则用药
D．长期、规则用药，禁酒
E．大剂量、短期，合并用药
