Which of the following writers is a poet of the 20th century

单项选择题The distinctive features of a speech variety may be all the following EXCEPT________.

单项选择题The distinction between parole and langue was made by______.

单项选择题The word tail once referred to the the tail of a horse , but now it is used to mean the tail of any animal . This is an example of________.

单项选择题Which of the following is NOT a romantic poet

单项选择题William Butler Yeats was a(n) _________ poet and playwright.