Ⅰ. Introduction. Today, in most English teaching classes, owing to the popularity of the student-centered teaching approach, the traditional teacher-centered teaching approach has gradually lost its dominating place. As far as extensive reading classes are concerned, this is no exception. The more communicative student-centered approach has been popularly adopted. As a result, the teachers’ roles in the reading classes are changing accordingly. A qualified teacher should be prepared to take different roles at different stages of teaching. Jeremy Harmer has pointed out that a teacher can be expected to act, for example, as a controller, an assessor, an organizer, a prompter, a participant and as a resource (Harmer, 1983). In this