题目

—Do you think I can wear sports clothes for his wedding?    —No, sports clothes are not______.        A proper                B. right                 C. appropriate      D. fit 答案：C 解析: 略下列结论可靠的是 A．试液白色沉淀沉淀不溶解 结论：试液中一定含SO42－B．气体无色气体白色沉淀 结论：原气体一定是COC．溶液冒白雾白烟 结论：原溶液一定是浓盐酸D．有色溶液变红色 结论：原溶液中一定含Fe3+