University graduates who have not obtained a teacher qualification certificate cannot be hired as teachers by a school in an area. All students in the history department of a normal university in the area must obtain a teacher qualification certificate before graduation. Therefore, any graduate of the history department of the university Students can be hired as teachers in the area. If the following is true, the above argument can be made. ['Everyone who has obtained the teacher qualification certificate has the same teaching level.', 'Obtaining a teacher qualification certificate is the only condition for college graduates to be accepted as teachers in the area.', 'All students who have obtained teacher qualifications in the history department of the normal university in the region will graduate.', 'The only way to know if you are qualified as a teacher is to take the teacher qualification exam.']