题目

Napoleon pushed on to Moscow, where one of the (great)disappointments of his lifewaited for him. 答案：【1】greatest下列说法正确的是（ ）A．根据反应Cu＋H2SO4CuSO4＋H2↑可推出Cu的还原性比H2的强B．电解含Pb（NO3）2和Cu（NO3）2的溶液，阴极上阳离子得电子次顺依次是Cu2＋、H＋、Pb2+C．含amolNa2S的溶液最多能吸收2.5amol的二氧化硫气体D．因Cl2的氧化性强于I2的氧化性，所以置换反应I2＋2NaClO3===2NaIO3＋Cl2不能发生