药物经济学研究中应注意的问题有（）。
A.成本测算
B.样本数
C.股市行情
D.汇率比
E.依从性
参考答案：A, B, E
This school doesn't have ______ that one does. [ ]
A. as many students as
B. many as students as
C. such few students as
D. so many as students as
制定化学教学目标的直接依据是（）。
A.化学课程目标
B.化学教学内容
C.学生的科学素养基础
D.学生身心发展特点
