An internet is a combination of networks connected by (1). When a datagram goes from a source to a  (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a  (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?

空白（2）处应选择（）

A.user

B.host

C.city

D.destination

市场参与者在公平有序交易中，出售资产所能收到或者转移负债所需支付的价格称之为（）。

A.均衡价格

B.公允价值

C.公平价格

D.绝对价值