从供选择的答案中，选出应填入下面叙述中{ }内的最确切的解答，把相应编号写在答卷的对应栏内。
The growth of switching has { A } a new generation of network management tools that help { B }cope with the challenges, { C }them to correlate device alarm in order to { D }pinpoint root causes, or to monitor service levels without depending on IP subnetting schemes. These new tools have become essential to coping with the primary { E }effect of any treatment that significantly increases network flexibility: added complexity.
供选择的答案
A：①create ②creates ③created ④creating
B：①technicians ②workers ③salesmen ④professors
C：①enjoying ②enabling ③engaging ④enriching
D：①better ②well ③welly ④goods
E：①back ②side ③front ④lateral
【解析】
本题是关于网络管理技术的，难度大一些。
A处主要考语法，完成时动词形式。
B处考词义，只有"technicians"(技术员)最合适。
C处从语义和语法上看应是"enabling"，意思是“使……能”。
D处副词修饰动词不定式，而且隐含比较级，只有"better"合适。
E处是“副作用”的意思，显然用"side"。side作形容词，表示"旁边的、侧面的、副的、枝的"，side effect则指副作用。
