解析： 细节题。文章第一段提出了本文的主题：“for those as yet unaware of such a disadvantage, refers to discrimination against those whose surnames begin with a letter in the lower half of the alphabet”一种不为人们注意的不公正仍然很普遍，即按字母顺序排列的习惯。第二段接着举了AAA A cars and Zodiac cars的例子证明这种被忽视的不平等，说明字母歧视是生活中隐形的歧视，从而证明了上面提出的主旨，故选A。
