Imported Thai rice is delicious and fragrant, which is welcomed by many people. In fact, in the Song Dynasty, foreign excellent Zhancheng rice varieties were introduced.

Test analysis: This question examines students' understanding of the birthplace of Zhancheng rice. According to what they have learned, Zhancheng Rice is named after Zhancheng, which is located in south-central Vietnam. Zhancheng Rice, also known as Zaohe or Zhanhe, is an early indica rice, which originated in south-central Vietnam and was first introduced to Fujian in the early Northern Song Dynasty. According to China ancient books, Zhancheng rice has many characteristics. The first is "drought tolerance". Second, it has strong adaptability and is "born without chaos". Third, the growth period is short, and it only takes more than 50 days from planting to harvesting.

Comments: This question is less difficult. Examining students' ability to remember historical knowledge, it is undoubtedly the result of the development of foreign trade in Song Dynasty that Zhancheng rice was introduced. Zhancheng rice was a typical exotic crop variety in ancient China. It was introduced into Fujian in the late Tang Dynasty and the Five Dynasties, and then spread northward under the leadership of the Song government. Its outstanding excellent quality makes it the dominant grain crop in the Yangtze River valley, and with the different geographical environment, many new varieties have evolved one after another. Therefore, Zhancheng rice has a far-reaching impact on the rice farming system in the Yangtze River basin.