题目

— Why did Lucy look so excited? — Well, she finally got the bike she this afternoon. A . expected B . was expecting C . has expected D . had been expecting 答案：D下列化学反应中，离子方程式表示正确的是（　　）A．少量金属钠加到冷水中：Na+2H2O═Na++OH-+H2↑B．铁粉加到盐酸中：Fe+2H+═Fe2++H2↑C．石灰石溶解在稀HCl中：CO32-+2H+═CO2↑+H2OD．硫酸溶液与氢氧化钡溶液混合：Ba2++OH-+SO42-+H+═H2O+BaSO4↓