I wonder when they ________ for Beijing. I will go to the train station to see them off when they _______.

A．will leave; leave

B．leave; will leave

C．will go; leave

D．go; leave

( )的开通，加快了违法犯罪信息的传递，也使警民联系的渠道更畅通、更便捷。

A．“110”报警服务台

B．警民联系卡

C．电台、电视台等媒体

D．热线电话