中国公民郑某2005年1～12月份每月工资2200元，12月份除当月工资以外，还取得全年一次性奖金6000元。郑某2005年应缴纳个人所得税( )元。

A．2370

B．2205

C．1980

D．1680

(51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(54) is the popular LAN developed under the direction of the IEEE802.5.

(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

（53）是（）

A. The hub

B. The bridge

C. The router

D. The proxy