_____ORBIS doctor who got here yesterday needed _______ X-ray machine to

examine his patients.

A．The; a

B．The; an

C．An; a

D．An; an

利息备付率表示企业( )的利润偿付利息的保证倍率。

A．支付税金后
B．支付税金前且支付利息后
C．支付利息和税金前
D．支付税金和利息后