题目

听下面一段对话，其后有五个句子，请根据你所听到的内容判断其正误，如果句子正确，选A；如句子错误，选B。【1】It was the first time for the man to shop in the store.A. T B. F【2】The man wanted to buy his wife a birthday present.A. T B. F【3】The diamond necklace was too expensive for the man.A. T B. F【4】The budget for the gift was $1000.A. T B. F【5】The man paid $720 for the gold necklace at last.A. T B. F20．25℃时，用如图所示装置除去含CN-、Cl-废水中CN-时，控制pH为9～10，阳极产生的ClO-将CN-氧化为两种无污染的气体，下列说法不正确的是（　　）A．可用石墨做阳极，铁做阴极B．阳极的电极反应式：Cl-+2OH--2e-=ClO-+H2OC．若铁做阴极，则电解过程中溶液中的阳离子向铁电极运动D．除去CN-的反应，2CN-+5ClO-+2H+=N2↑+2CO2↑+5Cl-+H2O