以下哪一种垄断市场模型能够获得最大产量：（）
A、配第模型
B、赫克曼模型
C、瓦尔拉模型
D、斯托克伯格模型
参考答案：D
The doctor assured the patient that there was ______ with her, but she could not help worrying.
A．seriously wrong nothing
B．nothing serious wrong
C．nothing seriously wrong
D．serious nothing wrong
保证中药质量的前提是
A．栽培条件
B．采收加工
C．产地
D．土壤
E．品种正确
