题目

--- Have you heard of the North Korea’s nuclear test? --- Yes, _____ news came as _____ shock to me. A. the; a  B. the; the     C. a; a       D. a; the 答案：A用碳酸钙与稀盐酸验证质量守恒的实验中：（1）反应中观察到的现象有______；______；______．（2）锥形瓶中的石灰水的作用是______；（3）图中小试管的作用是______．