【名词&注释】
输尿管结石(ureteral calculi)、医护人员(medical staff)、医务人员(medical staff)、献血者(blood donors)、肾功能(renal function)、目的地(destination)、药物中毒(drug poisoning)、兴奋剂(doping)、网络连接(network connection)、私密性(privacy)
[单选题]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?
A. B