单项选择题A．Extravagant.B．Formal.C．Dull.D．Toned-down.

单项选择题Which of the following is the world's smallest continent

单项选择题Ronald Reagan used to be a ______.

单项选择题Nathaniel Hawthorne was most famous for ______.

单项选择题What is the generation with a sudden, large increase in birthrate called in the United States after World War Ⅱ from 1947 to 1961