There are many reasons why some children have bad manners, ______ is the ill information on the Internet and in TV programme．

A．one of them

B．it

C．one of which

D．that

施主天线用于拾取来自于施主基站（BTS）的（）信号，并同时转发（）信号，由于通信是点对点的，因此要求施主天线应具有高增益和窄波束角的特点。