三年级有关大自然中一次有趣的发现习作300字200字400字

啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦来了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦来了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦了啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦

吃个饭更过分过分过分过分过分过分过分过分过分过分过分更丰富发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复付反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复付发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复发反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反反复复反复发反反复复

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着一大群蚂蚁。别看它们身材小巧玲珑，它们的秘密可多着呢！　　今天下午，我撕了一粒面包屑兴致勃勃地去观察蚂蚁，我把面包放在泥土上，等待蚂蚁来搬走它。不一会儿，一只瘦小的蚂蚁似乎闻到了香味，来到面包边，咬了一小口，仿佛在说；“真香啊！”它马上要搬面包，可它哪里搬得动。于是，它快速跑到蚁穴旁，找了一只身强力壮的蚂蚁，用触角碰撞那只蚂蚁，身强力壮的蚂蚁心领神会，又去通知第二只、第三四只、第四只……哦，原来蚂蚁交流信息时，是用触角碰撞的，而不是用语言的，我发现蚂蚁了第一个秘密。
　　不过几分钟，蚂蚁已经聚集了很多了，黑压压的一大片，足有几十只，他们雄赳赳、气昂昂地在向面包进军。“奇怪！他们走的路线怎么和第一只蚂蚁一模一样？”我迷惑不解地想。我查了查资料，才恍然大悟：原来，蚂蚁会在爬过的地方留下一种气味，蚁群就可以按照这种气味认路。我又发现了蚂蚁的第二个秘密。
　　这时，蚁群已经到了面包屑旁，它们想齐心协力把面包搬回蚁穴，可还是搬不动。于是，几只蚂蚁迅速爬上面包，把面包撕成一小粒一小粒的，放在地上，然后两三只蚂蚁抬起一小粒面包直奔蚁穴。不一会儿，我的面包全被蚂蚁带回家了。我再次发现了蚂蚁的秘密：搬食物时有时会齐心协力搬回家，有时会把食物分成小块，各自搬回家。
　　看着陆续回巢的蚂蚁，我突然想，如果蚂蚁的气味断了，它们还能认到路吗？我用树枝把蚂蚁爬过的路划了条横线，后面的蚂蚁在横线前停了一下，换了条路，继续向蚁穴奔去。原来，蚂蚁还可以用景物辨别方向。这又是蚂蚁的秘密。
　　只要做个生活的有心人，善于观察，你一定会发现大自然中的许多秘密哦！

着一大群蚂蚁。别看它们身材小巧玲珑，它们的秘密可多着呢！　　今天下午，我撕了一粒面包屑兴致勃勃地去观察蚂蚁，我把面包放在泥土上，等待蚂蚁来搬走它。不一会儿，一只瘦小的蚂蚁似乎闻到了香味，来到面包边，咬了一小口，仿佛在说；“真香啊！”它马上要搬面包，可它哪里搬得动。于是，它快速跑到蚁穴旁，找了一只身强力壮的蚂蚁，用触角碰撞那只蚂蚁，身强力壮的蚂蚁心领神会，又去通知第二只、第三四只、第四只……哦，原来蚂蚁交流信息时，是用触角碰撞的，而不是用语言的，我发现蚂蚁了第一个秘密。
　　不过几分钟，蚂蚁已经聚集了很多了，黑压压的一大片，足有几十只，他们雄赳赳、气昂昂地在向面包进军。“奇怪！他们走的路线怎么和第一只蚂蚁一模一样？”我迷惑不解地想。我查了查资料，才恍然大悟：原来，蚂蚁会在爬过的地方留下一种气味，蚁群就可以按照这种气味认路。我又发现了蚂蚁的第二个秘密。
　　这时，蚁群已经到了面包屑旁，它们想齐心协力把面包搬回蚁穴，可还是搬不动。于是，几只蚂蚁迅速爬上面包，把面包撕成一小粒一小粒的，放在地上，然后两三只蚂蚁抬起一小粒面包直奔蚁穴。不一会儿，我的面包全被蚂蚁带回家了。我再次发现了蚂蚁的秘密：搬食物时有时会齐心协力搬回家，有时会把食物分成小块，各自搬回家。
　　看着陆续回巢的蚂蚁，我突然想，如果蚂蚁的气味断了，它们还能认到路吗？我用树枝把蚂蚁爬过的路划了条横线，后面的蚂蚁在横线前停了一下，换了条路，继续向蚁穴奔去。原来，蚂蚁还可以用景物辨别方向。这又是蚂蚁的秘密。
　　只要做个生活的有心人，善于观察，你一定会发现大自然中的许多秘密哦！

发现太阳的妙用了
　今天我们上学时，看到太阳挂在天边。远远望去像一个大火球在天空滚滚流动，近看却像一面明亮的大镜子。

　　它放射出的光芒，给人们带来光和热，万物生长全靠它。它的光比金子还宝贵，谁也捉不住它，就像时间一样。

　　我盯着它看了一会儿，一眨眼，眼前就会冒出无穷无尽的小光球，太阳周围的云彩却变成红红的金光了。

　　太阳真美丽！它的奥秘真多，长大后我一定要开发利用它，发明一种设备，平时把太阳的光和热收集起来。转化成电能和光能。那时人们不会有停电的烦恼，在寒冷的冬天，可以有无污染的太阳能供热，不像有污染的烟了。那时，我就是超级大富翁，是世界电王了！哈哈！

　　现在我要努力学习，就像李四光那样善于思考，坚持探究，成为一个有出息的人！

　　山西省原平市青年街小学三年级：武豪吉
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作文网友  发表于 2012-9-2 19:17:37
我家楼下住着一大群蚂蚁。别看它们身材小巧玲珑，它们的秘密可多着呢！　　今天下午，我撕了一粒面包屑兴致勃勃地去观察蚂蚁，我把面包放在泥土上，等待蚂蚁来搬走它。不一会儿，一只瘦小的蚂蚁似乎闻到了香味，来到面包边，咬了一小口，仿佛在说；“真香啊！”它马上要搬面包，可它哪里搬得动。于是，它快速跑到蚁穴旁，找了一只身强力壮的蚂蚁，用触角碰撞那只蚂蚁，身强力壮的蚂蚁心领神会，又去通知第二只、第三四只、第四只……哦，原来蚂蚁交流信息时，是用触角碰撞的，而不是用语言的，我发现蚂蚁了第一个秘密。
　　不过几分钟，蚂蚁已经聚集了很多了，黑压压的一大片，足有几十只，他们雄赳赳、气昂昂地在向面包进军。“奇怪！他们走的路线怎么和第一只蚂蚁一模一样？”我迷惑不解地想。我查了查资料，才恍然大悟：原来，蚂蚁会在爬过的地方留下一种气味，蚁群就可以按照这种气味认路。我又发现了蚂蚁的第二个秘密。
　　这时，蚁群已经到了面包屑旁，它们想齐心协力把面包搬回蚁穴，可还是搬不动。于是，几只蚂蚁迅速爬上面包，把面包撕成一小粒一小粒的，放在地上，然后两三只蚂蚁抬起一小粒面包直奔蚁穴。不一会儿，我的面包全被蚂蚁带回家了。我再次发现了蚂蚁的秘密：搬食物时有时会齐心协力搬回家，有时会把食物分成小块，各自搬回家。
　　看着陆续回巢的蚂蚁，我突然想，如果蚂蚁的气味断了，它们还能认到路吗？我用树枝把蚂蚁爬过的路划了条横线，后面的蚂蚁在横线前停了一下，换了条路，继续向蚁穴奔去。原来，蚂蚁还可以用景物辨别方向。这又是蚂蚁的秘密。
　　只要做个生活的有心人，善于观察，你一定会发现大自然中的许多秘密哦！






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