According to Baidu Education Network, the knowledge of "how to teach" in the professional knowledge of subject teachers includes (). Knowledge about education. B. professional knowledge of teaching subjects. C. extensive cultural knowledge. D. knowledge of subject teaching methods. E. knowledge about children. The answers are A, D and E, so it contains knowledge about education, teaching methods and children. The test paper of this question comes from the task reference answer of Education Physics Examination of Central Radio and TV University (1-4).