[小学生快乐的国庆节作文200字]今天是国庆长假第一天，我一早跟爸爸去登岳麓山。爸爸说爬山就要选难走的山路，能锻炼毅力。于是我们选择从师大后山小路上山。上山的路一开始就不太好走，没几分钟时间我就出了一...+阅读
有趣的发现我的老家是蓝山，是一个蚊虫繁多的地方。每到炎热的夏日，天气闷热，这时就会有成千上万只蜻蜓在农田上飞舞，这让我想到一句谚语：蜻蜓低飞江湖畔，即将有雨在眼前。果然，经过我多次观察，我发现一旦看见很多蜻蜓低飞的时候，过了不久，就雷声滚滚，下起了雨。可是，为什么蜻蜓低飞就即将下雨呢？我疑惑不解。带着这个问题，我上网查了查资料，我终于知道其中的奥秘了：下雨前空气湿度很大，潮湿的水气会把昆虫的翅膀沾湿，导致昆虫的身体变重，同时，天气非常闷，越到高空空气越稀薄，呼吸越困难，于是，昆虫为了生存下去，只好低飞。蜻蜓也是一种昆虫，快到下雨天，它的翅膀也是会沾湿的，所以，它也要低飞。还有一种原因，就是蜻蜓以大多昆虫为食，下雨天昆虫们都低飞，所以，蜻蜓也低飞，因为这样它可以寻觅捕捉到更多的食物，换句话说吧，就是蜻蜓低飞，也是为了寻找食物。这真是一个有趣的发现。大自然有很多的奥秘，只要你仔细观察，就会发现许多神奇的事情。在这次对蜻蜓的观察中，我还明白了适者生存，优胜劣汰的自然规律，这次观察收获可真不小啊！分析：本文按要求重点写出了下雨时蜻蜓低飞的原因，这是一个有趣的发现。...
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