单项选择题
A.difficult... ubiquity B.imprudent... weakness C.traditional ... relevance D.revolutionary ... innovation E.extravagant... expense
A.observation... convenient B.analyses ... fashionable C.second-guessing ... costly D.footwork ... organized E.solutions... abstruse
A.imprudently... curb B.insolently ... insinuate C.intelligently... observe D.precariously ... expose E. insensitively ... brook