In addition to asking questions to have a certain degree of relevance, but also pay attention to the ladder. Ask the design, to follow the law from shallow to deep, from simple to complicated. A more complex problem or difficult to understand the knowledge point students are not easy to master thoroughly, so it is necessary for teachers in the classroom teaching in the link to set up a series of questions, ring-link, guide students step by step to explore the answer to the question, so as to achieve the purpose of teaching
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