Test and analysis: The middle and lower reaches of the Yangtze River are criss-crossed, and there are many lakes, including Poyang Lake, Dongting Lake, Taihu Lake, Hongze Lake and Chaohu Lake, which are connected with the Yangtze River and have the functions of regulating water volume and reducing flood peak. It is rich in fish, shrimp, crab, lotus, water chestnut and reed, as well as world treasures and aquatic products such as Chinese sturgeon, Chinese alligator and baiji. So choose option d in this question.

Comments: Memorizing the unique terrain and climate factors in the middle and lower reaches of the Yangtze River in China is the key to solve the problem. The middle and lower reaches of the Yangtze River crisscross, dotted with lakes, covering an area of 20,000 square kilometers, equivalent to 10% of the plain area.