In terms of content, 1 has the function of guiding the whole text and indicating the main idea (or: generally answering the "puzzling" question raised in the first paragraph is the key sentence of the whole text), indicating the influence of water characteristics on human nature and human spirit. Structurally, it plays a connecting role between the preceding and the following. From the characteristics of Jiangnan water to the influence of water characteristics on people, it describes the human beauty and spiritual beauty of Jiangnan people.
(2) vividly and concretely reveal the characteristics and different "water" of Jiangnan with poems and materials; It shows the influence of water quality in Jiangnan on scenery and human feelings, and expresses the main idea of the article; Let the water, scenery and human feelings in the south of the Yangtze River complement each other and add cultural color to the article; Let readers deepen their understanding of "water nourishes the scenery and people in Jiangnan and breeds the unique cultural attributes of Jiangnan". (Answer only two points)
The clear stream of Qushui is consistent with the theme of "Water Town South of the Yangtze River", which vividly describes the characteristics of Suzhou Pingtan, such as beauty, elegance, tactfulness, purity and long charm.