Which of the following statements about how to choose a level of diction is NOT true？（）

A.Choose the level most appropriate for the audience you are writing for.

B.You may choose to use different levels of diction for various purposes.

C.Slang is an informal， nonstandard form of language which consists of newly created and rapidly changing words and phrases.

D.Dialect is specific words or phrases used in different contexts， professions， and trade.

正确答案：Dialect is specific words or phrases used in different contexts， professions， and trade.