领导者与下级一起共同做出决策，对下级充分信任，与下级有良好的沟通，这属于( )。A

竹节虫的身体与竹枝极为相似，这属于（   ）

A．生物对环境的影响

B．环境对生物的制约

C．生物对环境的适应

D．环境对生物的适应

近年来，一些人热衷于过愚人节、圣诞节等“洋节日“，中秋、春节等传统节日渐被淡化。对此我们应该                                                    

A．大力弘扬中国优秀传统文化

B．坚决抵制外来文化

C．通过法律禁止中国人过外国节日

D．继承和发扬中国一切传统文化

加气板、砖抹灰，待中层灰六七成干时可进行面层抹灰。水泥砂浆面层采用______；混合砂浆面层采用______；石灰砂浆面层采用______。

水利部于( )颁发了《水利工程质量管理规定》。

A．1997年12月21日
B．1998年12月21日
C．1997年12月12日
D．1998年12月12日

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(66) 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.
(67) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(68) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(69) is the popular LAN developed under the direction of the IEEE 802.5.
(70) 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.

A．The hub

B．The bridge

C．The router

D．The proxy