Analysis of test questions: According to the knowledge learned at the beginning of 1992, Deng Xiaoping visited Wuchang, Shenzhen, Zhuhai, Shanghai and other southern cities, and delivered an important speech, collectively known as "Southern Talk", which not only played an important guiding role in the reform and development at that time, but also had great and far-reaching significance for the whole socialist modernization. It has promoted the in-depth development of China's reform and opening up, so choose D.