The number of students in our school        4000 and a number of them     good at playing ping pong.

A．is, is

B．are, are

C．is, are

D．are, is

沃家庭受理时（）作为沃家庭的主号码。3G新出的A\B\C中（）套餐，暂不纳入本期沃家庭B计划。3G（）用户允许加入沃家庭。