【正确答案】正确答案："Amn"t" , in addition to being an antecedent of "ain"t" , is a standard contraction of "am not" in some dialects of mainly Scottish English and Hiberno-English. In Scottish English, "amn"t" is generally used only when inverted as a question(i. e. "amn"t I"), often a tag question; in statements, the form "am not" is used instead.(2 points) In Hiberno-English, the question form(" amn"t I")is frequently used, while the declarative form("I amn"t")is less frequent. The Standard English form "I"m not" is available as an alternative to "I amn"t" in both Scottish English and Hiberno-English.(1 point) There is no undisputed standard equivalent of "amn"t I" : "am I not" , "aren"t I" , and "ain"t I" may respectively be considered stilted, affected, and substandard.(1 point) Regional dialect is a linguistic variety used by people living in the same geographical region. It has been found that regional dialect boundaries often coincide with geographical barriers such as mountains, rivers, or swamps.(2 points) Therefore, linguists all agreed that no variety of a language is inherently better than another. They insist that all languages and all varieties of particular language are equal in that they quite adequately serve the needs of those who use them. So, between the two sentences, linguistically, there is no one which is more authentic than the other. Or it can be said that A is more authentic than B officially, not linguistically.(2 points)

【答案解析】解析：考查标准方言与地方方言的区别。标准方言指的是以某地的方言为基础、以官方的形式确定下来的一种方言，是为人们所广泛接受和认可的，是学校和政府部门的语言。而地区方言是指某个地区的人们所使用的语言。这两句话中，第一句话就是标准英语的用法，第二句话则是苏格兰、爱尔兰等地区的方言。语言学家们普遍认为，没有哪一种语言或者方言优于另一种语言或方言，因此，上述来自不同方言的两句话是平等的，没有谁比谁更纯正更可靠这种说法。