依次填入下面句子中的词语最恰当的一组是( ) ①他光明磊落，胸怀坦荡，从不_______自己的过失。 ②经济改革如长江大河，奔腾向前，不可______。

A．隐讳 遏制

B．隐讳 遏止

C．隐瞒 遏止

D．隐瞒 遏制

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a  (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve  (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends  (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

空白（2）处应选择（）

A.procedure

B.function

C.route

D.flow