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    作文網,小學生作文,初中作文,高中作文,作文題材大全!

    小狗吐舌頭的秘密

    編輯:作文網 | 來源:四年級作文

    夏天的時候,天氣很熱,我在小河邊玩耍,跟在身后的小狗不停地搖著尾巴,還把舌頭伸得長長的。

    我頭腦里冒出一個問號——狗為什么要吐舌頭?它不累嗎?為了找到答案,我翻閱了很多資料,終于在《十萬個為什么》這本書里找到了答案。原來,人和動物身體表面都有汗腺,會分泌汗液,熱量通過汗液的分泌散發到體外。而狗的身體表面沒有汗腺,它的汗腺長在舌頭上。于是,在炎熱的夏天,為了維持正常體溫,狗只好伸出長長的舌頭,來散發全身的熱量。

    通過這次觀察,我發現了狗吐舌頭的秘密,也明白了一個道理:我們要用發現的眼光去看待任何事,才會有更多的收獲。

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