the teacher give students 2 minutes to skim a text, and when time is up, he asks students to stop and answer some questions. in this way, the teacher's role is a／an _____________.
题目内容(请给出正确答案)
the teacher give students 2 minutes to skim a text, and when time is up, he asks students to stop and answer some questions. in this way, the teacher's role is a／an _____________.
