题目

Mr. Wu is a very ______ man, who always explains things over and over again until we understand.    A．enthusiastic             B．energetic                 C．intelligent                D．patient 答案：D  下列溶液中不存在氯离子的是( )A．氯水 B．氯化氢溶液 C．氯酸钾溶液 D．“84”消毒液液