When we climbed up to the top of the mountain, we were all ___________.

A．out of the breath

B．short of the breath

C．out of breath

D．short of breaths

文物商店购买、销售文物，经营文物拍卖的拍卖企业拍卖文物，应报核准其销售、拍卖文物的文物行政主管部门备案。接受备案的文物行政主管部门应当依法保密，并将该记录保存（）年。

A.75

B.50

C.25

D.15