题目

The sun is bigger than the moon , ___ we all know it. A . and B . as C . which D . it 答案：A在含有酚酞的0.1mol/L氨水中加入少量的NH4Cl晶体，则溶液的颜色（    ） A．变蓝色                     B．变深         C．变浅           D．不变