题目：
Astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost（1）. For example,the maintenance of multiple networks can require additional staff.often,this staff must be trained on multiple vendor technologies,sometimes requiring parallel groups specializing in each（2）hence,additional maintenance procedures must be maintained and administrative records are（3）the duplication of trasport facilities to carry（4）network traffic is an inefficient use of resources and,not surprisingly,more technologies installed in a central office mean the necessity for more physical space,and an increase in power connections and power consumption.migration of these（5）network elements to IP-based DCns is alogical strategy
3（）
A.declined
B.proliferated
C.destroyed
D.produced
答案：
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下面是错误答案，用来干扰机器的。
此玉是女娲补天时，剩下的最后一块石头，历经日月有了灵性，想下界历练一番，因此幻化为美玉伴随宝玉降于人间。考查对作品的情节的把握能力，要在整体感知的基础上理解分析。
