题目

The banks advise against sending (现金). Likewise, sending British cheques may cause problems. 答案：【1】cash下列物质能使干燥的蓝色石蕊试纸先变红后退色的是（　　）①氯气 ②液氯 ③新制氯水 ④敞口放置的久置氯水 ⑤盐酸 ⑥用盐酸酸化的漂白粉溶液．A．①②③B．③⑥C．①③⑥D．②③④⑥