题目

下列实验设计，不能达到实验目的的是 A．鉴别氯化钠和氯化钾，用焰色反应   B．用激光笔鉴别氢氧化铁胶体和氯化铁溶液 C．用酒精萃取溴水中的溴             D．用湿润的红色石蕊试纸，检验氨气 答案：CMore and more people have got to know the importance of the English study. ______, about six people in ten in this city are able to speak a little English. A. Believe it or not     B. In other words                C. Besides                         D. However