题目

读一读，补充对话。 A. We can take turns. B. Sure, keep your desk clean. C. May I use your crayons? D. Shh. Talk quietly, please. E. I'm drawing the autumn trees. Lucy:Wow! What a beautiful picture! Amy: Lucy:Oh, I'm sorry. What are you drawing?Amy:Lucy: Ilike it. Can I draw pictures here, too?Amy:Lucy: OK.I will. Amy:Yes, of course. Here you are. Lucy:Thanks. 答案：【1】D【2】E【3】B【4】C【5】A（7分）向10ml0.1mol/l的Na[Al(OH)4]溶液中滴加0.1mol/l的HCl溶液，生成沉淀的量与加入的盐酸体积的关系如图 （1）写出OA段的离子方程式                                                     （2）写出AB段的化学方程式                                            （3）OB段反应共消耗        ml盐酸溶液； 此过程中生成沉淀最多时，沉淀物质的量是       mol,此时消耗的盐酸是      ml