LIU Zhi-Qiang1,2, WANG Yu-Chao1, CHENG Jun3, WANG Hou-Xiong1**
1. Faculty of Artificial Intelligence in Education, Central China Normal University, Wuhan 430079, China; 2. Sun Yat-Sea Memorial Secondary School, Zhongshan 528454, China; 3. Guangdong Provincial Institute of Education Research, Guangzhou 510035, China