—Look! There is         beautiful rainbow in the sky．

—Take the books for me, I’d like to take a photo of     rainbow before it disappears．

A．a; the

B．the; a

C．the; the

D．a; a

工作中经常处理、产生、知悉和掌握绝密级事项的人员，应当被确定为核心涉密人员。（）