166 students were randomly selected

166 students were randomly selected from 3-6 grades of a primary school to take CAS test and raven joint reasoning test. According to the results of Raven intelligence test, schoolwork performance and teacher evaluation, some pupils were divided into English learning excellent group and English learning difficulty group.The definition standard of excellent students group is as follows1. Academic performance standards. In the recent mid-term and final examinations, English academic achievement ranked the top 20% of the grade;2. Teacher evaluation criteria. English teachers rated their English learning results stable and excellent;