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问题 单项选择题 A1/A2型题

哪种局麻药必须做皮肤过敏试验（）

A.布比卡因

B.利多卡因

C.普鲁卡因

D.丁卡因

E.以上都不是

答案

参考答案：C

解析：普鲁卡因可引起过敏反应，故使用前应该做皮试，但皮试阴性者，仍有可能发生过敏反应，所以答案为C。

写作题

书面表达。

     你的同学李明生病住院了，几天不能上学。根据提示和要求完成短文。

     提示：1．去医院看望；  2．帮助他学习功课；  3．希望他早日康复。

     要求：1．短文须包括所有提示内容，可适当发挥。 2．文中不得出现真实的人名、校名和地名。

3．词数60-80。

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单项选择题

BGP is an inter-autonomous system routing protocol; it is designed to be used between multiple autonomous ( ) . BGP assumes that routing within an autonomous system is done by an intra-autonomous system routing protocol.BGP does not make any assumptions about intra-autonomous system （） protocols employed by the various autonomous systems. Specifically， BGP does not require all autonomous systems to run the same intra-autonomous system routing protocol.

BGP is a real inter-autonomous system routing protocol. It imposes no constraints on the underlying Internet topology. The information exchanged via BGP is sufficient to construct a graph of autonomous systems connectivity from which routing loops may be pruned and some routing ( ) decisions at the autonomous system level may be enforced.

The key feature of the protocol is the notion of Path Attributes. This feature provides BGP with flexibility and expandability. Path （） are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP （） without affecting the rest of the Internet.   New optional attributes can be added to the protocol in much the same fashion as new options are added to the Telnet protocol， for instance.

The provision for optional attributes allows experimentation that may involve a group of BGP （） without affecting the rest of the Internet.

A．routers  

B．states 

C．meters

D．costs
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