A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect 

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问题 A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running on(61)computers attached to the network. A socket(62)two addresses:(63). Sockets provide a(64)communication channel between one or more systems.There are(65)sockets separately using TCP and UDP.

选项 A、is made of
B、composed of
C、is composed Of
D、is consisted of

答案C

解析
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