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S3. When the students doing seatwork, teach ers usually (1)or(2).

【参考答案】

(1)answer questions(2)sit at their own desks and correct stu......

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S4. In secondary classes, discussions are different from the question-and-answer sequences because________.

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S5. Elementary education often relies on grouping students to________.

S3. When the students doing seatwork, teach ers usually (1)________or(2)________.