本文是常识性的阅读课文,重点在介绍激光的特点和用途。这是小学生比较陌生的当代科技前沿知识。板书根据文体特点采用了表格式设计。先按课文内容,将激光的特点形象地概括为“最亮的光”、“最快的刀”和“最准的尺”,然后在“原因”一栏里列出简要解说;最后一栏用“分述” This article is a commonsense reading text, focusing on the characteristics and uses of lasers. This is the cutting-edge knowledge of modern science and technology that elementary school students are unfamiliar with. The board book adopts a table format design according to the stylistic features. First, according to the content of the lesson, the characteristics of the laser are summarized as “the brightest light,” “the fastest knife,” and “the most accurate ruler,” and a brief explanation is given in the “Cause” column; the last column Use “description”