反馈——提供快速、明确的反馈，提供反馈在用户输入及以下情况

Feedback—Provide fast, unambiguous feedback for user input and the followingelements

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所设计的课件不仅具有主题明确、交互性强、因材施教及便于自主学习等特点，而且能给学习者提供有效的学习反馈和充足的练习机会。

Clear aim, frequent interaction, suiting instruction to the student's level, convenience for independent learning, supplying learners not only with time to drill and …

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