人教部编版二年级下册语文17 要是你在野外迷了路 ppt课件（省示范课）.ppt

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6、元成才路,状元成才路,状元成才路,要是你在野外迷了路， 可千万别慌张。 大自然有很多天然的指南针， 会帮助你辨别方向。,课文解读,指南针：一种判别方位的简单仪器。指南针的前身是中国古代四大发明之一的司南。常用于航海、大地测量、旅行及军事等方面。,知识备查,古代的司南,指南针,大自然中的“天然的指南针”是怎样帮助人们辨别方向的呢？轻声读课文第2-5小节，然后在小组里讨论。,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,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,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,状元成才路

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13、来帮忙。 枝叶稠的一面是南方， 枝叶稀的一面是北方。,“大树”能给人帮忙，把树当成人来写，运用了拟人的修辞手法。,大树也会来帮忙,思考：树叶的稀稠和阳光有什么关系？,树的枝叶稀稠和太阳光照射时间长短及照射量多少有关。树冠的南面受太阳光照射多，树叶茂密；北面由于受遮挡，光照较少，树叶长得稀。,稠 稀 南 北,雪特别怕太阳， 沟渠里的积雪会给你指点方向。 看看哪边雪化得快，哪边化得慢， 就可以分辨北方和南方。,思考：怎样用沟渠里的积雪来分辨南北方向？,冬天，太阳从南边射过来，沟渠里的积雪朝南的一面受照射的时间长，化得快，积雪朝北的一面，太阳照射不到，雪化得慢。,状元成才路,状元成才路,状元成才路,

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