题目

下列试剂：①浓氨水  ②氯水  ③硝酸银  ④浓硝酸  ⑤浓盐酸  ⑥溴化银，其中必须用棕色试剂瓶装的有A．①②③④⑤⑥  B．②③④⑥     C．②③⑤⑥      D．①③④⑤  答案：B解析:略  －Have you ever seen ________ film Roman Holiday? －I think it is ________ interesting one． [　　] A． the; an B． a; the C． a; an D． the; a