北京仁爱国际英语学校八年级学生魏环境向福州的网友李志愿发了一封电子邮件，询问了一些情况。请根据来信帮他回一封电子邮件。 注意：1.词数：60词左右； 2.邮件的开头和结尾已替你写好，不计入总词数。
Dear Li Zhiyuan， I feel very excited about my visit to Fuzhou and meeting you for the first time! But I'm still not sure about the following questions： 1.Are there any rivers or lakes in your city? 2.Is the water dirty or clean? Why? 3.Did you do anything useful to protect the clean water? Please let me know.
Your friend， Wei Huanjing
Dear Wei Huanjing, I am very excited to receive your e-mail. I am interested in your questions. There are many rivers in our city. Ming Jiang River is one of the longest rivers. But the water in the river isn't as clean as before. This is because people cut the trees down a lot. As we know, trees can keep the water much cleaner. On March 12th, We often plant some trees on the hills. More and more trees are growing. I think the water is becoming cleaner and cleaner. Looking forward to meeting you soon. Yours, Li Zhiyuan