题目

Mike’s mother isEnglish . SheEnglish. ( )A. a; teacher; teacher B. an; teacher; teach C. an; teacher; teaches 答案：【答案】C【解析】略9、以下是我们熟悉的几种气体．其中不能用下图所示装置干燥并收集的是（省略了铁架台等仪器）（　　）A、NH3B、CO2C、H2D、CH4