题目

What happened to Joe?A.He was overcharged. B.He broke the traffic rules.C.He hurt himself accidentally 答案：【答案】B【解析】【原文】W:Why did Joe show up in court yesterday?M:It was said that he was there to face a traffic charge. He was fined 200 for violating the traffic rules.下列物质属于强电解质的组合是（　　） ①NaHCO3?　②CO2?　③NH3?　④SO3?　⑤CaO　 ⑥NaOH　 ⑦BaSO4?⑧KNO3 ⑨CH3COOHA．①④⑤⑥⑧⑨             B．①⑤⑥⑦⑧                 C．②③④                   D．⑨