单项选择题The author of Sister Carrie is ______.
单项选择题English Elizabethan age was most celebrated for its achievements in ______.
单项选择题The study of how we do things with words is the study of ______.
单项选择题Charlotte Bronte's masterpiece is ______. A. Jane Eyre B, Wuthering Heights C. Tess of d'Urbervilles D. Agnes Grey
单项选择题In communication one may shift from formal English to informal English or from standard English to non-standard English. This is known as ______.