阅读理解。阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
Puerto Rico(波多黎各)may be part of the USA but its music and dance is a mixture of both Spanish and American rhythms. The country, as a result, is a mixture of very new and very old. It exhibits the open American way of life yet remains the more formal Spanish influences. This is reflected in the architecture, not just the difference between the