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这个单元共三篇说明文。《宇宙里有些什么》是说明宇宙的构成的;《食物从何处来》是说明食物的来源的;《奇特的激光》是说明新的科技发明的。这三篇文章在写作上都有一个共同的特点,就是抓住事物的特征,运用多种不同的说明方法,有条理地进行说明。据此,本单元的训练要求如下:一、使学生掌握怎样抓住事物特征进行说明的方法。二、使学生掌握举数字,作比较,用比喻,下定义等具体说明方法。本单元采用“阶梯式”进行训练。第一阶梯,
There are three explanatory notes in this unit. Something in the Universe is a description of the composition of the universe; Where Food Comes from is a source of food; the “Special Laser” is an illustration of a new technological invention. Each of these three articles has a common feature in writing. It is to grasp the characteristics of things, use a variety of different methods of explanation, and explain them in an organized manner. Based on this, the training requirements of this unit are as follows: First, to enable students to grasp how to grasp the characteristics of things to explain. Second, to enable students to grasp the figures, for comparison, using metaphors, such as the definition of specific methods. This unit uses “ladder” training. The first step,