授新课前指导学生预习，不仅是培养学生自学能力，养成自学习惯的有效措施，而且是搞好课堂教学的主要一环。学生通过预习，发现问题，解决问题，越钻就越有兴趣；熟悉了课文，带着问题上课，学起来积极性就高了。教师在学生预习的基础上讲课就会抓关键，读讲得当，主导作用就会发挥得更好。 Giving students a preview before giving a new class is not only an effective measure for cultivating students’ self-learning ability and self-study habits, but also a major part of classroom teaching. Students through pre-reading, find problems, solve problems, the more interested the more drilled; familiar with the text, with problems in class, learning to be high enthusiasm. The teachers will focus on the key to the students’ preparatory studies and will play a better role in the leading role.