--- How cool the iPhone5 is !

---In our shop it_____ very well now. Get one before it________out.

A． sells; sells

B．sells; is sold

C．is sold; is sold

D．is sold; sells

频分多路复用是多个话音通道在基带频率上按（）顺序排列合并成一个宽带信号的过程。

A、时间

B、频率

C、先后

D、空间