59. According to the article, the true purpose of a teacher is __________. (A) to help her/his students to know how to learn by themselves (B) to get her/his students to study as much as they can in and off the classroom (C) to talk to her/his students about the meaning of life (D) to be a good friend and tutor of her/his students (E) to say “I don’t know,” when s/he has no idea of the given question