【正确答案】 C

【答案解析】[解析] 形近识别。
obsequious卑躬的；巴结的：He is an obsequious owner．他是个善于讨好的店主。oblivious未察觉；不注意：The government seems oblivious of the likely effects of the new legislation．政府似乎并没有注意到新法可能带来的后果。ob servant善于观察的"寂静的：An observant shop assistant had remembered ex actly what the man was wearing．有个机警的店员准确记得那个男子的穿着。 obsolescent即将过时的，逐步淘汰的：Electronic equipment quickly becomes obsolescent．电子设备淘汰得快。