具有补气养阴，健脾，润肺，益肾功效的药物是（）。
A.石斛
B.黄精
C.玉竹
D.百合
E.枸杞子
参考答案：B
— Were you in time for the lecture?
— If I ______ told earlier, I would have. [ ]
A. had been
B. was
C. were to be
D. should be
从预防动机的角度看，企业持有现金余额主要取决于( )。
A．企业的生产水平
B．企业临时举债能力的强弱
C．企业的现金流量
D．企业愿意承担风险的程度
