题目

听下面一段较长对话，回答以下小题。【1】What is the relationship between Mary and Justin?A. Boss and secretary. B. Good friends . C. Husband and wife.【2】How will Mary spend her holiday?A. Go swimming. B. Work in her office. C. Stay with her children. 答案：【答案】【1】 C 【2】 C 【解析】此题为听力题，解析略。【1】此题为听力题，解析略。【2】此题为听力题，解析略。正确使用化学用语是学好化学的基础。以下化学用语的使用中不正确的是( )A．酒精的实验式为：C2H6O B．原子核中有7个中子的碳原子：136CC．铝离子的电子式：Al3+D．二氧化硅的结构式O=Si=O