单选题 "Gangnam Style", the ______ popular song from South Korean recording artist PSY has just become the most watched video on YouTube ever.
A. sanely B. insanely C. rationally D. insatiably

【正确答案】 B
【答案解析】[解析] 句意是：来自韩国发片艺人PSY的疯狂流行的歌曲《江南Style》，已经成为YouTube上观看次数最多的视频。sanely“心智健全地，稳健地”；insanely“疯狂地”；rationally“理性地”；insatiably“不知足地，贪得无厌地”。因此本题选B。