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8、成才路,状元成才路,为什么题目“打扫”要加引号？它具体指的是什么？找出课文的句子读一读。,批评讽刺,把灌木统统砍光，把杂草统统除尽，连地上的枯枝烂叶也不放过。,被打扫过的森林变得怎样？ 森林面貌顿时改观了：林子里又宽敞又洁净，连一根杂草也没有。 不想森林却从此遭了殃。几年过去了，橡树和菩提树的叶子越来越少，光秃秃的像一把把扫帚，有些树木甚至干枯了。,形象地说明森林被破坏的程度大，被“打扫”干净的几年之后，面临毁灭的危险。,光秃秃,你还能写出相同结构的词语吗？,橡树,菩提树,扫帚,原来，大自然中的一切事物都是互相联系的。,中心句：揭示了大自然中的一切事物都是相互依存、相互联系的。,为什么森林会遭
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11、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,林务官把灌木丛砍了，把野草锄了，鸟儿飞走了，森林里的害虫就逞凶啦。它们大量繁殖，成群地向树木进攻，吃树叶，咬树根，钻树心。没有天敌来制服害虫，树林就渐渐给毁了。,形象地写出了害虫对森林造成的破坏之大，点明了“打扫”森林造成危害的真正原因：人为地破坏了食物链，使生态失衡。,砍灌木 除杂草,做法,破坏生态 森林遭灾,“打扫”森林,害虫兴森林毁,后果,人类的老师,听课文朗读，说说人类的老师这篇课文的主要内容，并理清文章层次。,人类的老师介绍了科学家从_、_等动物身上得到_，从而有所_、有所_，告诉我们要更好地_ _，合理地
12、_，为人类_。,蜻蜓,鲸,启示,发明,创造,利用大自然的规,服务,律,利用大自然,第一部分（ ）：分别叙述了科学家从_、_等动物身上受到_，有所_和_。,第二部分（ ）：总结全文，指出_，点明_。,1、2,3,蜻蜓,鲸,启示,发明,创造,主题,生物是人类的好老师,课文具体写了哪些例子说明生物是人类的老师？齐读第一、二自然段。,1.研究蜻蜓的翅膀解决飞机机翼因剧烈抖动而破碎的问题。,2.研究鲸的“流线型”外形减少船只在水中的阻力，大大提高了航行的速度。,流线型：前圆后尖，表面光滑，略像水滴的形状。具有这种形状的物体在流体中运动时所受阻力最小。,知识备查,状元成才路,状元成才路,状元成才路,状元成
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