题目

同学们做完实验后的玻璃试管中常附着难清洗的物质。下列清洗方法错误的是     A．内壁有CaCO3的试管用稀盐酸清洗    B．内壁有碘的试管用酒精清洗     C．内壁有铜粉的试管用稀硫酸清洗      D．内壁有植物油的试管用洗洁精清洗 答案：C—Why didn’t you go to the cinema with us yesterday evening? —I________for my uncle from Beijing at the station. A．was waitingB．am waitingC．will waitD．waited