①Backups in case the lesson goes too fast and there are a few minutes left
②Prepared for good students
③Prepared for bad students
④Used for emergency.
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相关题目
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What role does a teacher play in the following activity? The teacher gives students 2 minutes to skim a text, and when time is up, he asks students to stop and answer some questions.
【单选题】
Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.