题目

Every one of us went to the zoo ________ Tom. He was ill. A . except B . besides C . including D . and 答案：A下列各组物质，前者属于电解质，后者属于非电解质的是A．NaCl晶体、BaSO4B．铜、二氧化硫C．硫酸、酒精D．熔融的KNO3、硫酸溶液