药物经济学这门学科的产生与下列因素有关：

A．新药的大量使用

B．推行处方药与非处方药的分类管理

C．医疗卫生费用的增长率过快

D．药物的不良反应增加

E．国家需要做出对病人健康有利而又能降低卫生费用的各种决策

In a typical audiolingual lesson the procedures are followed in the order of （）

A. imitation, recognition and repetition, pattern drills and follow-up activities

B. recognition, imitation and pattern drills, repetition and follow-up activities

C. imitation, recognition, pattern drills and repetition, and follow-up activities

D. recognition, imitation and repetition, pattern drills and follow-up activities