作业是课堂的延伸,是巩固和消化课堂所学知识、培养学生能力、提高学生素养的最佳载体。传统教学中学生的作业往往偏重于死记硬背,机械记忆且枯燥重复,从而加重了学生学习负担,使学生学得毫无激情,严重挫伤了学生的学习积极性。新课标确立了化学课程改革的重点:以提高学生的科学素养为宗旨,重视科学、技术与社会的相互联系。而加大与拓 Homework is an extension of the classroom, is to consolidate and digest the knowledge learned in the classroom, develop student ability, improve student literacy best carrier. In the traditional teaching, the students ’homework tends to emphasize rote memorization, repetition of mechanical memory and dullness, which aggravates the students’ learning burden and makes the students have no passion and severely dampens their enthusiasm for learning. The new curriculum established the focus of chemical curriculum reform: to improve the scientific literacy of students for the purpose, emphasis on science, technology and social interrelatedness. And increase and extension