Which of the following words is closest in meaning to 'vain' in the context of expressing excessive self-admiration?
答案解析
核心考点：同义词辨析（贬义色彩）。正确答案B依据：'Arrogant'与'vain'均含贬义，指过度自我欣赏。错误选项分析：A（褒义）、C/D（反义词）。易错点：混淆褒贬语义差异。
正确答案：B