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 t
