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．full-duplex

B．half-duplex

C．simplex

D．complex

有关毛细血管瘤的叙述，下列哪项是错误的（）

A.多见于婴儿

B.女性多见

C.大多数为错构瘤

D.有些能够自行停止生长或消退

E.只能通过手术治疗