某幢楼从二楼到三楼的楼梯共11级，上楼可以一步上一级，也可以一步上两级，若规定从二楼到三楼用7步走完，则上楼梯的方法有_________种．
35
_________ a sports meeting in our school this Friday afternoon.
A．There is going to be
B．There will have
C．There are going to be
D．There is going to have
掘进机的分类方法有哪些？
