A 对 B 错 答案 对The USA is bounded by Canada on the south and by Mexico and the Gulf of Mexico on the north with the Atlant 点我阅读全文
A 对 B 错 答案 错The United States is situated in the central part of North America with its two youngest states – Alaska an 点我阅读全文
American Independence Day is a federal holiday commemorating the adoption of the Declaration of Independence on July 4th 点我阅读全文
Social security generally refers to all measures established by the U. S. legislation to maintain individual or family i 点我阅读全文