新课的导入起着承上启下的作用。“良好的开端是成功的一半”,新课导入是否成功,决定着一堂课的成败。笔者从事教学工作近20年,总结自己的教学得失,认为新课导入的成功,关键在于应遵循以下几个原则。一、遵循“边际效应”,激发学生 The introduction of the new class plays a role in the connection. “A good beginning is half of success.” The success of the new lesson will determine the success or failure of a lesson. The author engaged in teaching work for nearly 20 years, summed up his own teaching gains and losses, that the key to the success of the new lesson is to follow the following principles. First, follow the “marginal effect” to inspire students