A:将打磨后的铝片浸入硫酸铜溶液中,铝片表面析出红色物质,溶液由蓝色逐渐变为无色
B:木炭在氧气中燃烧,发出白光,生成能使澄清石灰水变浑浊的气体
C:在CO还原Fe2O3的实验中,玻璃管中的黑色粉末逐渐变红
D:打开浓盐酸的试剂瓶时,瓶口出现白雾
—Look, she ____ (talk) with her students over there.