[单项选择]Standard usage include those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of language and used in informal speech or writing, but not considered acceptable for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, however, refers to words and expressions understood by a large number of speakers but not accepted as appropriate formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both colloquial usage and slang are more common in speech than in writing.
Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expr
A. does not approve of either slang or colloquial speech in any situation
B. approves of colloquial speech in some situations, but not slang
C. approves of slang and colloquial speech in appropriate situations
D. does not approve of colloquial usage in writing