—What are you going to do this afternoon?

—I am going to the cinema with some friends. The film _______ quite early, so we_______ to the bookstore after that.

A．finished; are going

B．finished; go

C．finishes; are going

D．finishes; go

发信者与收信者不在同一部主机内，但都在Internet内，发信主机可以不需直接将信送抵目标，它可以选择一个中继站将信转发至目标，这种中继站一般称为___________。