--Is __________ Mp4 player beside the school bag yours, Lily?

--No. I don’t have __________ Mp4 player like this. Maybe it’s Lucy’s.

A．an, the

B．a, an

C．the, an

D．the, a

下列哪种是腺垂体功能减退症最常见原因（）

A.希恩（Sheehan）综合征

B.各种垂体肿瘤

C.原发性空蝶鞍症

D.糖尿病血管病变

E.颅内感染后遗症