20．请听一段独白，完成第14至第16小题． 14．What is Mike doing？ A．Having a competition with the visitors． B．Leading a conversation about the visit． C．Making an introduction to the visit． 15．When will they take the tour？ A．Before class． B．In class． C．After class． 16．How many places are included in the tour？ A．Three． B．Four． C．Five．
