2019一年级语文下册课文6《小壁虎借尾巴》拓展阅读小壁虎的两个秘密素材新人教版.doc

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1小壁虎的两个秘密壁虎为什么能在墙上爬来爬去细心小朋友会发现壁虎有个绝招:它能在光滑的墙壁和房顶上自由自在地爬来爬去,却不会落下来。这是为什么呢?捉来一只壁虎,我们看看它的四肢的每个趾,就明白了。原来,壁虎的每个趾上都长着一条条深沟,这些深沟不仅能增加趾与光滑表面之间的摩擦,还能将身体吸附在光滑的表面上,这样就使它无论怎么活动,也不至于掉下来。它的这种特殊结构与它的生活方式是十分适应。壁虎断掉自己尾巴的秘密壁虎断掉尾巴,实际是它防敌的一种手段。当壁虎尾巴断掉之后,虽然暂时还能动弹,但它其实没受到大脑的支配,只是神经还暂时活着的原因。壁虎尾巴掉下来之后,还能长出新的尾巴。

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