《回声》讲的是一只小青蛙在石桥洞里听到了自己的声音,它奇怪地问妈妈,青蛙妈妈以石击水,以水波作比,使它明白了那声音就是回声。课文用童话的形式,生动地解释了回声这一自然现象。在教学中,我在进行语言文字训练的同时,借助电教手段直观形象的优势,帮助学生理解回声这一熟悉而难懂的现象,收到了较好的效果。一、投放幻灯片,让学生感知回声产生的环境。课文的一至三自然段,讲的是小青蛙在石桥洞里听到了奇怪的声音。这部分是课文的一个侧重点, “Echo” speaks of a little frog who heard his own voice in the stone bridge hole. It strangely asked her mother, the frog mother stone hit the water waves, make it understand that the voice is echo. Text in the form of fairy tales, vividly explained the echo of the natural phenomenon. In teaching, while conducting language training, with the help of the visual image of electronic teaching methods, I helped students to understand the familiar and difficult phenomenon of echo and received good results. First, put slides, let the students feel the echo of the environment. The text of one to three paragraphs, is about a small frog heard a strange voice in the stone bridge hole. This part is a focus of the text,