练习,是课堂教学不可或缺的环节,是教学活动的延伸和拓展,其重要性不言而喻。然而受班级教学的限制,布置的练习即作业,往往因“顾此失彼”达不到练习的目的。如何优化“练习”的设计与布置,充分发挥“作业”的功能,以“练”促学,以“练”促思, Practice, is an indispensable part of classroom teaching is the extension and expansion of teaching activities, its importance is self-evident. However, subject to the limitations of class teaching, placement of practice that is homework, often because of “Gu Gu lose ” can not reach the purpose of practice. How to optimize the design and layout of “practice”, give full play to the function of “operation”, promote learning by “practice” and promote by “practice”