Import class, is an important part of classroom teaching, but it must become part of the most natural, the most appropriate and best start. The saying goes: well begun is half done, must be on a sound blow to students ' hearts, let the students thought produced in the collisions of the sparks of wisdom, continuation of the Elimination of other courses of thought or psychological interference of distracting thoughts, bring together students ' attention quickly, they noted with interest the commitment to new learning situations, improve the efficiency of learning
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