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  • 未來的一個瞬間

      “小蜜蜂,嗡嗡嗡,飛到西來飛到東。”這是我小時候經常唱的一句兒歌。可是有一個問題我老是不大白:為什么蜜蜂會“嗡嗡嗡”地叫呢?

      顛末察看,我發覺蚊子和蒼蠅正在飛翔時也會發出同樣的聲音。于是我想,是不是它們有一個出格的發聲器官,能發出如許的聲音呢?可我一直沒有找到明白的謎底。這個問題老是憋正在心里。

      后來正在一次偶爾的機遇里我終究找到了謎底。一個盛夏炎暑的半夜,我無聊地躺正在扶手椅里打盹。突然,一只厭惡的蚊子籌算侵略我的“地皮”,揮舞著它的兵器——尖嘴和同黨。我厭惡地伸出汗津津的手,隨便一抓,沒想到竟把那只可惡的家伙給抓住了。咦,怎樣剛抓住它,聲音就沒了?哦,可能是一時受了驚嚇,當然就呆頭呆腦、啞口無言啦。

      我正預備把它捻死,可腦子里一個問題像火花似地閃現出來:會不會是同黨扇動發出聲音的呢?我把那只不利的蚊子從手心里捏出來,用指尖悄悄地捏住了它的肚子。我緊盯著這微不腳道的小工具,只見它的同黨飛快地扇動了起來,嗡嗡地叫著,聲聲響亮而慘痛。它正掙扎著想從我的手里逃出來。我趕緊用另一只手捏住它。我又試了幾回,發覺了一個紀律,每次它發出聲音時,老是正在同黨扇動的時候。看來,問題就出正在同黨上!

      為了進一步領會,我又活捉了一只蒼蠅。由于它的同黨和身體合正在一路,所以我只好捏住它的頭。成果跟一樣。

      從那當前,我只需一碰見科普書,就火燒眉毛地打開目次,查找這個問題。功夫不負有心人,有一天正在《新世紀青少年科普典范》上我終究找到了謎底。本來,我們的耳朵只能聽到每秒鐘20—2萬次擺布的空氣振動頻次所發生的聲音。低于或高于這個頻次的聲音,我們都無法聽見。蜜蜂每秒鐘同黨扇動250次;蒼蠅每秒100次;蚊子則高達1000次。我們所聽到的“啼聲”恰是它們同黨扇動所發出的。而另一些蟲豸,好比蝴蝶,每秒鐘扇動只要6次擺布,所以我們聽不見它們發出的聲音。

      早上去炒粉,雖然軍訓累,可是早上卻7得不多啦,那么多粉,忽忽 早上一來就坐軍姿,,一下就…

    未經允許不得轉載:小學生作文網 » 未來的一個瞬間

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