下列物质中，属于强电解质的是（填序号，下同）______，属于弱电解质的是______，既不属于电解质也不属于非电解质的是______．

①醋酸（CH₃COOH）；②苛性钠；③氨气；④铁；⑤蔗糖；⑥硫酸；⑦氨水；⑧水；⑨二氧化碳=10；⑩硫酸钡．

At school Kitty is a __________ student. She is good at all her lessons. [ ]

A. bad

B. top

C. tall

D. healthy