参考答案

正确答案：A
解析：细节题。本题问的是：青少年穿古怪的衣服，留古怪的发型是因为他们______。依据文章第3段的前半部分“Young people often irritate their parents with their choices in clothes and hairstyles，in entertainers and music．This is not their motive．They feel cut off from the adult world into which they have not yet been accepted．So they create a culture and society of their own”可知，青少年选择古怪的衣服和发型等的主要目的不是为了气父母，而是因为他们感觉自己无法被成人世界所接受，所以他们必须创造出一个他们自己的文化和社会，从而证明自身的存在价值。故选A 。