“凡事预则立,不预则废。”农民种地要备耕,建房要备料,军队打仗要备战,教师讲课要备课,足见“预”之重要性。自然,学生上课也要备学,这就是预习。预习最大的好处是有助于形成学习的良性循环。预习使学生变得主动,站在主动进攻位置上的人当然容易打胜仗。一位北大学生说,预习是“合理”抢跑,一开始就“抢跑”领先,争取了主动,当然容易取胜。 “Farmers are required to prepare for farming, build houses to prepare materials, prepare military forces for warfare, prepare teachers for lectures, and show the importance of” pre-praying. “ Naturally, students have to prepare for class, which is a preview. The biggest benefit of previewing is to help shape the virtuous circle of learning. It is of course easy to win the war who prepares to make the student active, standing on the initiative offensive position. A Peking University student said that the preview is ”reasonable “ to start running, from the beginning ”snatch run " lead, for the initiative, of course, easy to win.