—My son is lost . Have you seen a boy passing by here?

—I saw        boy hidden behind          tree over there . You may go and have a look.

A．a; the

B．the; the

C．a; a

D．the; a

下列股利理论中，认为股利支付率越高，股票价值越大的是（）。

A.税差理论

B.客户效应理论

C.“一鸟在手”理论

D.代理理论