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.

单项选择题The Declaration of Independence was written by________.

单项选择题The words kid, child, offspring are examples of______.