【正确答案】 A

【答案解析】[解析] 画线词vague为形容词，意为“模糊的；含糊的”。A项imprecise意为“不确切的；不明确的”，例：She was rather imprecise about the cost of the trip.她对差旅费不太清楚。B项concise意为“简明扼要的”，例：Her letter was concise, omitting everything not pertinent to the job for which she was applying.她的信很简明，省去了所有跟申请就业不相关的东西。C项unpolished意为“未经修饰的”，例：She is reading an unpolished poem.她在读一首未经润色的诗。D项elementary意为“基本的；初级的”，例：How can you expect to succeed without even the most elementary knowledge of the field?连这个领域中最基本的知识都没掌握，你怎么能成功呢?故选A。