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一、导语同学们先听个故事。从前,有一个人,胆子很小又很迷信。有一天黑夜,他穿过一条狭窄的小巷时,快步走在石子地面上,忽听得在自己的脚步声后,还夹杂着一种“咯咯”的声音,心里一慌,脚步不由地加快起来。可是“咯咯”声也紧跟着快起来,好象有什么在后边追他似的。这一下,他可吓坏了,怀疑是鬼追上来了,于是飞步狂奔,最后竟然晕倒在地上了。这是怎么回事呢? 同学们也都看了课文后边的附录。小剧本中的大郎为什么“吃了惊,奇怪地望着”?寓言中的那只狗为什么开头很骄傲,后来却吓得回头就跑?原来,他们三个都不明白回声是怎么回事。那么,我们知道回声是怎么回事吗?回声是怎么形成的呢?科学道理是什么呢?今天,我们就学习说明文《回声》,来准确认识这一自然现象吧。二、导读思考: 1.课文中哪一句话是总的介绍、说明回声的? 2.为什么开头要引用艾青的诗,起什么作用?
First, the students first listen to a story. Once upon a time, there was a person who was very shy and superstitious. One night, as he passed through a narrow alley, he swiftly walked on the ground of the stone, and after hearing his own footsteps, he was still mingled with a kind of “grilling” sound, and he felt a panic. Speed up. However, the “grilling” sound quickly followed, as if there was something chasing after him. In this case, he was terrified. He suspected that the ghost had followed up, and he rushed forward, eventually fainting on the ground. What happened to this? Students also looked at the appendix at the back of the text. Why did Dalang, who was in the small play, “shocked and looked at strangely?” Why did the dog in the fable begin to be very proud, but then he frightened to go back and run? It turned out that the three of them didn’t understand what the echo was all about. . So, what do we know about the echo? How is the echo formed? What is the scientific truth? Today, we learn to explain the “Echo” to accurately understand this natural phenomenon. Second, guide reading thinking: 1. Which sentence in the text is the general introduction and explanation of the echo? 2. Why did you want to cite Ai Qing’s poem at the beginning?