题目

根据下面的对话情景,在每个空白处填上一个适当的句子,使对话的意思连贯、完整。A: Excuse me, sir. I want to post a letter.【1】?B: Sure. Go down this street and turn left at the third crossing, and you will see a post office beside a supermarket.A: Thank you. 【2】?B: It's about 15 minutes’ walk.A:【3】?B: Yes. You can take the No. 28 bus. There is a bus stop over there.A: I have left my watch at home.【4】?B: Oh, it's ten twenty.A:【5】B: You are welcome.（10株洲）10．实验室常用二氧化锰与浓盐酸反应制取氯气，其化学方程式为：MnO2＋2HCl(浓)MnCl2＋Cl2↑＋2X根据上述已配平的化学方程式，可知X的化学式为A．H2OB．H2C．H2O2D．HClO