The Renaissance was a European phenomenon originated in ______.

单项选择题In Australia, the Constitution can be changed only by ______.

单项选择题President Jefferson bought ______ from France and doubled the country's territory.

单项选择题Who was the first great American poet to use free verse

单项选择题Semantic triangle is made up of reference, symbol and ______.

单项选择题Percy Bysshe Shelley was famous for ______.