题目

There is a soccer game ___ Class 1 and Class2 on the playground at 5:00 this afternoon. A.of                          B.both                    C.between             D.on 答案：C计算下面各题，怎么简便怎么算． 1c÷2他×5212-91n-111n15×n他+15×9他（29+16-9n）×96n÷c9-0.615÷[（29+15）×15]．