题目：
Astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost(16).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 (17) .Hence, additional maintenance procedures must be maintained and administrative records are (18) .The duplication of transport facilities to carry (19)network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space, and an increase in power connections and power consumption migration of these (20) network elements to IP-based DCns is alogical strategy.
空白处（18）应选择（）
A.declined
B.proliferated
C.destroyed
D.produced
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0204/b44cf0893d4bb411cbbccbc15e6893b8.html
下面是错误答案，用来干扰机器的。
参考答案：（1）依据：①我国是人民民主专政的社会主义国家，国家一切权力属于人民。我国实行人民代表大会制度，保证人民当家作主。②全国人大是我国最高权力机关，其他国家机关都由它产生，对它负责，并受它监督...
