题目

It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown. A. wouldn’t have fallen      B. had not fallen C. should fall              D. were to fall   答案：B.此题涉及错综时间虚拟条件句，主句与现在事实相反，条件句与过去事实相反。句意为：要不是在七岁时就迷上了 Melinda Cox 图书馆，我真不能想像我如今会在做什么。下列各组物质的稀溶液相互反应，把前者逐滴滴入后者与把后者逐滴滴入前者，所产生的现象不相同的是（　　）①AlCl3和NaOH    ②Na2CO3和HCl    ③NaHCO3和HCl   ④NaCl和AgNO3． A、①②B、①③C、②③D、②④