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 (31) computers attached to the net-work. A socket (32) two addresses: (33) . Sockets provide a (34) communication channel between one or more systems. There are (35) sockets separately using TCP and UDP.

A．is made of

B．composed of

C．is composed of

D．is consisted of

生产要素参与价值分配的实质是

A．劳动创造价值的理论

B．劳动的简单要素都创造价值

C．价值创造与价值分配没有区别

D．资本主义性质的分配原则