the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
夏天到了,知了在树上叫。而游泳却成了广大朋友的爱好。可不少有人因为这而溺水身亡。
看了《安全视界》里的视频,我的心陡然一紧,有多少还没来得及绽放的鲜花,就这样凋零了。多么遗憾呀!所以,游泳时,我们要认真执行以下的规则:
1、不在陌生的水域游泳;
2、不在无家长的带领下游泳;
3、不能结伴游泳……
如果看见别人溺水了,第一件事就是叫大人帮忙。有些同学私自下水救人,却正好应了一句歇后语:草人救火—自身难保。那么游泳时腿抽筋了,怎么办?专家认为,要使劲的蹬腿。
正因为还是每年有至少2起溺水事件,所以我们的“妈妈”——祖国,制订了“小学生,六严禁”,内容如下:
1、严禁私自下水游泳;
2、严禁擅自与他人结伴游泳;
3、严禁在无家长,无老师带队的情况下游泳;
4、严禁到不熟悉的水域游泳;
5、严禁到无安全设施,无救护人员的水域游泳;
6、严禁不不会水性的同学擅自下水施救。看我们的祖国多么爱我们啊!
水,是我们的生命之泉,却也成了***人的利器,我们要正确的利用这么珍贵的水,不要让它成了害人的凶器。让我们—栋梁之花永远的绽放吧!
俗话说:“见字如见人”,练就一手好字是必不可少的,无论是写文章、记笔记、写,都离不开写字。所以,我决定每天坚持练字一小时。
我的写得比较好,但不够生动,有待改进。在往后的写作中力争写得生动具体些,学会运用优美的词句,把自己内心最真实的感受表达得淋漓尽致。让文章更优美;让读者对我的作文产生兴趣而继续读下去。
学好语文,上课要做到认真听讲,按照预习—听课—总结—复习—作业这五个环节进行,坚持独立思考;提倡和同学讨论,想象文章的.背景、人物的形象。养成边听课边做笔记的习惯,手、头、眼、耳并用。
学好语文,除了课内学习,课余自习也很重要,养成学习语文的自觉性,正确的学习方法是必不可少的,爱因斯坦说过:“A=X+Y+Z”。A表示成功;X表示勤奋;Y表示方法;Z表示少说空话。学语文也一样,只要勤奋、有方法、多做事少说空话,就一定能学好。
学好语文,除了课堂学习之外,还要多看一点有用的课外书籍,积累优美词句用于写作。当然也不能忘了按时完成作业,更不能因看书而忘了正事。
最后,要求我自己强化正确、填满缺陷、改正错误,做到认真听讲,记好笔记,独立思考,按时完成作业。不要心存等待和依赖。
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