参考答案

正确答案：A
解析：文章在“What are the functions and values of wetlands?”的标题下“Biological productivity．”一段中指出“Wetlands are some of the most biologically productive natural ecosystems in the world，comparable to tropical rain forests and coral reefs in their productivity and the diversity of species they support”：“与热带雨林和珊瑚礁类似，在生产性和所提供的物种的多样性方面，湿地也是世界上最富有生物生产性的自然生态系统”。故答案为Yes。