[人教新课标]五年级语文上册演示课件假如没有灰尘.ppt
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第三组
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1.朗读课文,读完说说没有灰尘行不行?
2.边读边画出生字词,多读几遍,体会在课文的意思 。
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削 弱 调 节
朝 晖 尘埃
日晕 湿漉漉
(xuē)
(tiáo)
(zhāo)
(āi)
(yùn)
(lù)
庞然大物 气象万千 古往今来
时时勤拂拭 ,勿 使染尘埃
(fú shì)
(wù)
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1)默读课文,看看灰尘有什么 特点?用“──”画出来。灰尘有什么作用?用“﹏﹏”画出来。
2)与同组同学互相交流。
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灰尘的特点
作用
说明
方法
2.
3.
散射光线
使光线变柔和
不加选择地散射
七色阳光
使天空有颜色变化
具有吸湿性
调节气候,
气象万千
1
做假设
做假设
做假设
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假如自然界真的没有灰
尘,我们将面临怎样的情
形呢?用一段话说明。
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