采用（）的模式的企业应具有较强的资源和营销实力。
A．市场集中化
B．市场专业化
C．产品专业化
D．市场全面覆盖
参考答案：D
—My mother is ill in hospital.
—_______________ [ ]
A. Oh, is she OK?
B. I'm sorry to hear that.
C. I don't know.
D. What's wrong?
