Decide what role the teacher is playing in the following activity: “When the students are making a report of their group mates' likes and dislikes, the teacher first set an example, and if someone makes an error, the teacher asks him or her to revise.” This teacher is probably a (an)________.
本题考查教师的角色。教师作为评定者，需要纠正学生的错误（避免小题大做）以及组织反馈（不提倡吹毛求疵）。