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
单项选择题Which of the following is NOT one of the major branches of linguistics