“学而不思则罔”。设计课堂教学一定要着眼于学生的“思”。有意识有计划地用多种方法，开启他们的心智，拨动他们的感情，激活他们的思维，促使他们学习处于兴奋状态。怎样激活思维呢？抓住矛盾，才能调动学生思考的积极性。《诺曼致弗雷德》是一封较长的婉拒信。学生看得懂? “Study but not thinking is.” Designing classroom teaching must focus on students’ thinking. In a conscious and planned way, they open their minds, stir their feelings, activate their thinking, and encourage their learning to be excited. How to activate thinking? To seize the contradictions can mobilize the students’ enthusiasm for thinking. “Norman to Fred” is a longer letter of refusal. Can students read it?