In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the an

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问题 In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
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(66)computers attached to the network. A socket(67)two addresses:(68). Sockets provide a(69)communication channel between one or more systems.
   There are(70)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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