The International Maths Summer Camp was held in Wuhan,____ the top students in maths from all over the world.

A．bringing back

B．bringing together

C．which brought around

D．gathering around

设置Gs接口可以（）。

A、在GSM和GPRS之间切换。

B、可以通过PS域发送短信。

C、CS寻呼可以在PS域上进行。

D、以上皆正确