----Do you know _______ young man under the tree?

----Yes, but only a little, maybe he is _______ university student.

A．a; an

B．a; the

C．the; an

D．the; a

下列各项中，______是对公司实力和经营能力较精确的估计。

A．产品市场占有率
B．企业文化特征
C．质量水平
D．技术水平