单项选择题To which two great families or groups of families does the passage refer
单项选择题______ made the important distinction between linguistic competence and linguistic performance.
单项选择题Tess of the D'Urbervilles and Jude the Obscure are two representative novels written by ______.
单项选择题______ is a comedy of manners written by Oscar Wilde.
单项选择题Christopher Columbus discovered the North American continent in ______.