A.蘸有浓盐酸与浓氨水的玻璃棒靠近,有白烟产生
B.Fe(OH)2白色沉淀在空气中放置变成红褐色
C.打磨过的铝箔加热熔化但不滴落
D. Na2O2加入水中后,带火星的木条复燃
—How was your climbing Mount. Huang?
—I didn't believe I could do it ___________ I got to the top.
关于俄罗斯的地理特征,叙述正确的是( )