Though the No smoking signs have existed for long in public places, heavy smokers often them and light up cigarettes.
A. abandon
B. postpone
C. decline
D. ignore
网友回答
A. abandon
B. postpone
C. decline
(答案→)D. ignore
解析：动词辨析。A抛弃；B延期，使…延续；C下降；D忽视，不理睬；句意：尽管“禁止抽烟”的标志在公共场所存在很长时间了，但是那些抽烟较多的人总是忽视这些牌子，点燃了香烟。故D正确。