题目

 —Why are you so happy, Jim?           —Because there        a basketball match between my favourite teams today.           A. is going to have     B. are going to be                 C. is going to be       D. are going to have 答案：C下列关于实验室制氧气用排水法收集的实验操作先后顺序中不正确的是（ ）A．先给试管预热，再对着药品加热B．先检查制氧装置的气密性，再装药品C．先熄灭酒精灯，再将导管从水槽中取出D．等导管口排出的气泡连续均匀后，再开始收集