Exposition (i el)is perhaps the type of writing that is more frequen tly used by a student, a scientist, or a professional, exposition means expounding or explaining Argumentation(议以论) essay tries to make the reader agree with its point of view and support it, to persuade him to change his mind or behavior, and to approve a policy or a course of action that it proposes◼ Exposition(说明) is perhaps the type of writing that is more frequently used by a student, a scientist, or a professional, exposition means expounding or explaining. ◼ Argumentation(议论) essay tries to make the reader agree with its point of view and support it, to persuade him to change his mind or behavior, and to approve a policy or a course of action that it proposes