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一、设疑的时机要巧.有人把注意力比喻成获得知识的窗户,这个比喻很恰当.如果学生听课注意力不集中,就相当于知识的窗户没有打开,知识是进不来的、我们在自然课教学中总是注意抓住时机设疑,不断地唤起学生的有意注意.具体做法是:上课开始就设法把学生的注意力集中到学习新课上来.例如,我们在教学《声音是怎么产生的》这一课时,讲新课前就请同学们说出今天早上和现在都听到了哪些声音?学生回答、教师板书:汽车声、说话声、铃声、哨声、水声………教师接着设疑;这些声音是怎么产生的呢?这个问题一提出,一下子吸引了同学们的注意力,这时学生开始独立思考,继而小声议论,后来竞变成了激烈的争论.达到了激发学生求知欲望的目的.
First, the timing of suspicion is clever. Some people compare the attention to the window of knowledge, which is appropriate. If the students do not pay attention to lectures, the window of knowledge is not opened, and the knowledge can not come in. In the teaching of nature, we always pay attention to grasping the timing and suspect the students 'intentions constantly, in order to arouse the attention of the students constantly: the beginning of the class try to focus the students' attention on the new lesson, for example, How to produce "this class, before the new class, please tell students what are the voices heard this morning and now? Answer students, teacher blackboard: car sound, voice, ringtones, whistles, underwater sound ......... The teachers then set suspicions; how did these voices come about? The question was raised at one time, attracting students' attention all of a sudden, when students began to think independently, then whispered, and later turned into fierce arguments. Stimulate students desire for the purpose of learning.