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这是一篇科学常识性课文,重点说明了月食过程及其发生的原因。教学时,可抓住两条线索: 一是月亮形象的变化。发生月食时,月亮由“圆圆的”“大玉盘”,到“好象被什么咬去了一块似的”,到“成了小船一般,象镰刀,象眉毛,象弯弯的细钩……象一面锣”的演变过程。再到月亮复原还旧,整个过程写得清楚明了、形象生动,使没有见过月食的同学读了也大致能了解月食是怎么一回事。而这些又都统一于“看”:随着时间的推移,看清月食的整个过程。在此全过程中,紧紧抓住月亮“形状”和“光亮”的变化仔细观察,运用精妙的比喻具体形象地描写变化的特征。教学中除了让学生掌握一些自
This is a scientific common-sense text that focuses on the eclipse process and why it happened. Teaching, you can seize two clues: First, changes in the image of the moon. When the eclipse takes place, the moon consists of a “round” “jade plate” to “what seems to have been bitten by a piece of cake,” to “become a boat like a sickle, like an eyebrow, ...... Like a gong ”evolution. And then restore the moon to the old, the whole process clearly written, vivid, so that students who have not seen the eclipse also read about how the eclipse can be one thing. And these are unified in the “look”: As time goes by, see the whole process of the eclipse. In this whole process, we must pay close attention to the changes in the “shape” and “lightness” of the moon and carefully use the subtle metaphor to describe the changing features in a concrete way. In addition to teaching students to master some