题目

Denmark is one of the happiest nations on earth with some of the best quality of life. You don’t need statistics to understand the Dane’s happy lot. Walk around any Danish town and you’ll experience some of the most harmonious civic spaces anywhere. Their intimate scales and perfect transport systems combine the rich history and bold modern lines of the built environment to delight the eye, and the locals’ manners and sense of humor is refreshing. Denmark’s capital Copenhagen is a remarkable city with well-preserved medieval streets, renowned art galleries, Michelin-starred r有机物的系统命名为： ，它的H-NMR谱中有 个峰，峰的面积比为 ．