题目

写出下列反应的化学方程式 （1）高锰酸钾制氧气                                    （2）生成相对分子质量最小的氧化物的化合反应                                    （3）红磷燃烧                                                                           Children in that kindergarten are sometimes asked to sit on their hands            ______listening to the teacher.A.whileB.thoughC.afterD.during