一、课堂练习要有一定的针对性新知识总是一定旧知识的延续、再发展 ,因此 ,针对新旧知识的内在联系而设计的铺垫练习要重在架桥铺路 ,为知识的正迁移作好准备。如教学数学第八册第１８页～第１９页例５时先出示 :华山小学三年级栽树５６棵 ,四年级栽的棵数是三年级的２倍 ,三 First, the class practice must have a certain relevance New knowledge is always the continuation of the old knowledge, and then development, therefore, for the inherent relationship between old and new knowledge designed to pave the way for paving the way for the positive transfer of knowledge to make good ready. Such as teaching mathematics eighth volumes on page 18 ~ page 19 Example 5 when first appeared: Huashan primary school planting trees in the third grade, the number of fourth-year planted trees is three times the number of two, three