我们知道非洲象体重很重,绝大多数的非洲象都有4吨,有的甚至超过十吨。可是你知道吗?这么大的非洲象,居然会被一只只有十克重的红嘴奎利亚雀给吓跑,你们是不是感觉很奇怪呢?
某天早晨,六十岁的托普来到非洲的某个公园。走着走着,托普欣喜地看见一群非洲象在喝水,有的低着头用鼻子吸水,有得伸着鼻子喷出巨大的水花……托普赶忙架起照相机,拍下这些非洲象喝水的动作。
过了一段时间,天色突然暗了下来。托普好奇地问自己:天怎么黑了?是要下雨了吗?几十秒钟后,托普看清楚了,原来是成千上万只的红嘴奎利亚雀向乌云一样飘来了。红嘴奎利亚雀很快把象群包围了,尖锐的嘴不停地向象群发动攻击,不一会儿,大象们的身上便伤痕累累,鲜血淋淋。十几分钟后,两头弱小一点的大象倒下了,好不容易逃出包围圈的其他大象纷纷落荒而逃。
一只红嘴奎利亚雀,确实算不上什么,但是,如果有成千上万只红嘴奎利亚雀,那么它的伤害绝对无人能敌。这就是团结的力量!只要团结,就一定可以制造出不可思议的事情!
几个星期前,我前面的那个同学带了几个西红柿来到学校。
下课时,她来到了我的桌前面,给我一个西红柿,还说:“这西红柿不是那么酸,还有点甜,你尝一个吧!"我听后就吃了一口,还真的不是那么的酸。
可是,我的桌子上还留有几粒西红柿的种子。我就拿起桌布把擦了擦,擦完后,我也没顾上去洗桌布。
几天后,我去拿桌布出来擦窗,可是,我却发现,在我的桌布里有几株西红柿的苗。那时,我大吃一惊,心想,我的布里为什么有几株西红柿苗呢?一定是上次我擦西红柿子的时候忘了洗桌布,布还是湿的,所以才会在那里发芽。
我看到就想把苗拿下来,可是它的根,以经贴到了桌布上,所以很难拿下来。就这样,我每天去给桌布湿水,等到它长到和我的手一样大了,我在把它移到泥土里,一个星期,两个星期,到第三个星期后。我发现西红柿竞然长的比我的手还大。我就慢慢把它拿起来,然后,在土地里挖了一个大坑,把西红柿苗种了起来。
现在,西红柿苗已经长的比我的胳膊一样长,上面还长出了很多个小小的'西红柿了呢!
我,臭氧层是指大气层的平流中臭氧浓度相当高的部分,我的主要作用是吸收短波紫外线。大气层里的我主要以紫外线打击双原子的氧气,把它分为两个原子,然后每个原子和没有分裂的氧合并成臭氧,臭氧分子不稳定,紫外线照射之后又分为氧气分子和氧原子,形成一个继续的过程臭氧氧气循环,是这产生我的。我大多分布在离地面20~50千米的高空上,我的臭氧一般是由紫外线制造。我对你们的作用很大,是帮你们阻挡强烈的紫外线,不让你们受到伤害。
我和你们人类一样也会受到破坏,当氟氯碳化物漂浮在空气中时,由于受到阳光中紫外线的影响,开始分解出氯原子来。这些氯原子的`活性极大,它很顽皮,常喜欢与其它物质结合,因此它遇到臭氧时,便开始产生化学变化,使我受到破坏!
如果我被破坏了,将会给你们造成以下的影响:增加得皮肤癌的可能主要是黑色素癌。
损害眼睛,增加白内障患者;削弱免疫力,增加传染病患者;农产品减产以及其品质下降,尤其是大米、小麦、棉花、大豆、水果等经常使用的农作物;减少渔业产量,紫外线可***死10米水深内的水生生物。
这是我的自我介绍,请大家记得要爱护我、保护我,永远做好朋友!
老师的话:这篇作文讲的是臭氧层是怎么样呗破坏以及破坏后会对人类造成什么样的危害。语言简练而又俏皮幽默,能用到一些说明方法,你真棒。
冰淇淋是生活中不可缺少的一道美食。夏天没胃口时,尝些冰淇淋,是一个迅速补充体力降低体温的好方法。尤其对小朋友来说更是挡不住的诱惑,聪明的妈妈能在小朋友不愿吃饭时,偶尔改变方式以冰淇淋取代主食,同样能摄取营养和热量,漂亮的颜色又让人产生食欲。
你知道吗?美国每年能销售10亿加仑的冰淇淋,8%的牛奶最终变成冷冻食品。如今,各种各样的冰淇淋店更是遍布世界。现在就让我们一起看看冰淇淋的历史吧。
The earliest reports of people enjoying flavored ice desserts come from the Romans and the Chinese. Marco Polo returned from his famous expedition with fruit-flavored ices, reporting that Asians had been making them for thousands of years. These delicacies became popular in France in the 1500s, but only among royalty. Over the next few centuries, the process of making them evolved from hauling mountain ice to salt/ice freezing methods. Cream was introduced as an ingredient, and by the 1700s, people were enjoying a dessert that was very similar to today's ice cream.
The hand-cranked ice cream freezer was first developed by Nancy Johnson in 1846. Ice was readily available from large warehouses in that era, so ice cream became a treat that could be enjoyed by almost anyone, not just the rich. Ice cream making was revolutionized again in 1851, when Jacob Fussel started the first wholesale ice cream manufacturing operation in Baltimore, Maryland. Fussel's dairy business had excess cream and he couldn't figure out what to do with it. He tried using it to make ice cream, and before long his ice cream business outsold the rest of the dairy.
The business slowly evolved for the next few decades. Manufacturing methods and ingredients improved, while refrigeration technology became cheaper and more efficient. By the 1920s, home refrigerators and freezers became more common, which gave the ice cream industry another boost. Sugar was rationed in the US during World War I, but the ice cream industry convinced the government that ice cream was an "essential food”. Ice cream factories were allotted sugar rations and production continued.
Ice cream increased in popularity until the Depression years caused a drop in sales for virtually all non-essential goods. Sales increased in the years leading up to World War II before leveling off in the post-war years. The rise of the giant supermarket created demand for cheaper, mass-produced ice cream, but quality suffered. The 1960s saw a resurgence in "premium"ice cream, while the following decades saw the market fragment into low-fat varieties for the health-conscious, including frozen yogurt, fruit bars, ice milk, fat-free ice cream, and dozens of other varieties. However, ice cream still makes up about 60 percent of the market share among frozen desserts. While ice cream is enjoyed worldwide, it has become an American tradition
这种玻璃的用处非同一般:从里面看外面无比清楚,外面看里面便模糊不清;它能够调节室内的亮度;能够消除噪音;能够使室内冬暖夏凉,成了健康的“空调”;最重要的,是它能够源源不断地产生新鲜氧气!
原来,“变色氧气玻璃”的两面各有一层肉眼无法看见的薄膜,中间还有一张极细的`滤网,它们可以互相“呼应"。外面这层薄膜吸收室外的空气,透过滤网净化,最后通过里面那层薄膜传送到室内,所以,哪怕室内室外空气不流通,有了这种玻璃,室内再闷也不怕啦!
神奇的”变色氧气玻璃“,小轿车里可以使用,公交车,大巴车也可以使用,飞机可以使用,玻璃房也可以使用......
将来,相信这听似不可思议的玻璃,会真的出现在我们身边!
面对强权,请挺起胸膛,勇猛与之搏斗。
海明威说过,一个人可以被毁灭,但绝不能被打败。回首抗日战争中,勇猛与敌人搏斗的'英雄事迹不胜枚举。黄继光毅然地地用胸膛挡住了敌人的机关枪;邱少云在烈火焚身中的坚定不移的眼神;叶挺在“魔鬼”的监狱中的慷慨赋诗。在如野兽般残忍的日军面前,他们都挺起了自己的胸膛,他们身躯虽毁,精神长存。
是国人们挺起的胸膛,使国家渡过了最艰难的时期,而假如一个人没有了尊严与勇气,只会在敌人面前点头哈腰、唯唯诺诺,那么他定将遭世人唾弃、千夫所指。况且在犹如猛虎的敌人面前,你便要做一只狮子,与之抗衡,如若甘为一只逆来顺受的羔羊,必将为人鱼肉。
纵使你有一夫当关,万夫莫开之勇,也终究寡不敌众,于是,你便需要机智地与敌人周旋,能屈能伸,坚韧地与敌人做斗争。
后退并不代表懦弱,而是为了蓄力,前进一大步。***提出“'主动撤离延安。”减免了不可低估的损失。越王勾践,亡国贱俘,忍辱负重,卧薪尝胆,最终得以复国;哈姆雷特装疯卖傻,深入敌营,最终为父报仇。这一切的成功都与其机智密密相关。
楚汉之争,江东楚霸王项羽,力压群雄,手握雄兵,又为旧贵族后裔,天下唾手可得,却因一次战败刘邦,无脸回江东见父老乡亲,自暴自弃,最终自刎江边,引得后人感慨道:“江东子弟多才俊,卷土重来未必失。”
勇猛与机智二者缺一不可,一个智勇双全的人,才能成就大事。
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