单选题 Slang(俚语) is one of those things that everybody can recognize and nobody can define (下定义). Not only is it hard to wrap slang in a definition, it is also hard to distinguish (区别)it from such similar things as colloquialism (口语), provincialism (方言), jargon (行话) or trade talk (行业话).
Usually, slang tends to be transient(短暂的). Thus their children often laugh at parents when this older generation uses slang which was considered to be the height of fashion in their own youth. Of course, the slang teenage children use today is very different from that of their parents. Indeed it might ever be some obscure (晦涩的) foreign language as far as the older generation is concerned for it is totally beyond their understanding.
It is often said that a slang term stops to be slang when it is "accepted by the dictionary". This is not really the case. You will find many slang terms listed in dictionaries are still slang terms. The term stops to be slang when it drives(派生) its respectable synonym(同义词) out of use, or when it gets a meaning that cannot be expressed otherwise.
Such things have happened. The term "hot dog" was once a slang term, but it couldn"t be considered so now. No one in America would go up to a counter and order "a sausage sandwich". Similarly "varsity", originally a slang contraction (缩写) of university, has acquired a special meaning which only it expresses and is no longer slang. Jazz, when it means a particular kind of music, is scarcely a slang form, since there is no more respectable word meaning that kind of music.

单选题 What can readers know about slang from this article?

A、 Nobody has defined and recognized slang, although they are used by a generation after another generation.
B、 Slang tends to be transient though they have found their way in dictionaries.
C、 Having difficulty in defining slang and telling slang from similar things, people still use slang frequently.
D、 Slang can be totally beyond the understanding of the old.

【正确答案】 C

【答案解析】[解析] 关于文章细节的题。题目问：读者可以从本文了解到哪些关于俚语的知识? A尽管一代又一代的人使用俚语，但是没有人给俚语下过定义并且了解俚语。这与文章内容矛盾。B尽管俚语渐渐地为词典收录，但是它们的生命力却很短。这与文章内容矛盾。C尽管人们在给俚语下定义与辨别与俚语相似的语言现象时有困难，但是人们仍然经常使用俚语。这与文章内容一致。D老年人完全不懂俚语。文章中没有提到。所以答案为C选项。

单选题 Which of the following titles do you choose for this article?

单选题 Parents are often laughed at by their children when ______.

【正确答案】 D

【答案解析】[解析] 关于文章细节的题。题目问：父母在什么时候会被孩子笑话?原文第二段第二句说“当父母使用他们年轻时最流行的俚语时，常常会被孩子们笑话”。A他们使用过时的俚语。B他们想成为最时尚的人。C他们尽力照孩子做的做。D尽管不能追逐时尚，他们却想去追逐时尚。A、B和C好像都是正确的，但是只是提到了事实，没有把父母使用他们年轻时最流行的俚语的意图包括进去，为干扰项。只有D恰当。

单选题 From the last paragraph readers can learn ______.

【正确答案】 C

【答案解析】[解析] 关于文章段落主题的题。题目问：从最后一段中读者可以知道什么?在最后一段中，作者用“hot dog”, “varsity”和“Jazz”三个俚语说明了俚语到什么时候不再是俚语。所以C选项at what time a slang word is no longer slang(俚语到什么时候不再是俚语。)与此完全一样。因此正确答案为C选项。