个人网上银行年服务费是（）。A.30元/年 B.3元/月 C.1元/月 D.免费

从南方往北方长途运输水果时，常常将浸泡有酸性高锰酸钾溶液的硅藻土放置在盛放水果的容器中，其目的是

A．利用酸性高锰酸钾溶液杀死水果周围的细菌，防止水果霉变

B．利用酸性高锰酸钾溶液吸收水果周围的氧气，防止水果腐烂

C．利用酸性高锰酸钾溶液吸收水果产生的乙烯，防止水果早熟

D．利用酸性高锰酸钾溶液的氧化性，催熟水果

地球说：“唉！我的气喘不过来了！”其语意是指[ ]

A、水土流失严重

B、生态平衡失调

C、大气污染严重

D、水体污染严重

香料烟B类的颜色为（）（）。

新设立的物业服务企业，其资质等级按照( )核定。

A．标准等级
B．基本等级
C．最高等级
D．最低等级

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．X.25

B．ATM

C．FDDI

D．SMDS