三年级动物英语作文(精彩20篇)

Although people are now said to protect animals, but there are a lot of people wrong-headed, continue to hunt animals, cause many animals to the road to extinction. Humans and animals to see, sold at the same time, made from animal skins coat... But these people ever think, if you are an animal, are hunted by humans, what would you think? Some people say: "Im not a animal." But now hunted animals, animals would like to have? No, never. Although some people know how to care for the animals, but they will only pretending to go to the education of others, and themselves but also damage the environment, killing animals, so enthusiastic tasting animal meat is delicious. Take the puppy around us, for instance, although not a national secondary other rare animals, but also our good partners, whether master how to use it, it still is very dedicated, but humans find dog meat is delicious, began to kill the dog.

Now, some animals have almost extinct, take the crocodile, for instance, although it is very fierce, but humans are more fierce. And in the eyes of human beings, crocodile skin can be made into the luggage, handbags, wallets, shoes and other goods. Because of some organs from animals has the prominent economic value, thus become a subject of human plunder use, become the main factor of extinct animals. So the crocodile, has now become almost extinct animals.

Animal friends, a lot of destruction of human will have serious adverse consequences, ecological environment caused by serious imbalance, so that the human living environment is destroyed. Eliminate animal, is to eliminate human oneself, if one day the animals in the world are gone, that human can survive? To protect animals, cherish this nature of every creature! Let us start from now, to protect animals, make the world a better place!

虽然人们现在都说要保护动物，但是还有很多人执迷不悟，继续猎杀动物，导致许多动物都走向了灭绝的道路。同时人类还拿动物来观赏、卖钱，用兽皮做大衣……但这些人有没有想过，如果你是一只动物，却遭到了人类的猎杀，你会怎么想?有些人说：“我又不是动物。”但是现在人类大量捕杀动物，动物会愿意吗?不，永远不会。有些人虽然知道怎样去爱护动物，可是他们只会假惺惺地去教育别人，而自己却照样破坏环境，猎杀动物，照样兴致勃勃的品尝动物鲜美的肉。就拿我们身边的小狗来说吧，虽然不是国家一二级别的珍贵动物，但也是我们身边的好伙伴，不管主人怎么使唤它，它仍然很兢兢业业，可是人类发现狗肉鲜美，就开始捕杀小狗。

现在，有些动物已经快要灭绝了，就拿鳄鱼来说吧，它虽然很凶猛，但人类更凶猛。而在人类的眼中，鳄鱼皮可以制成行李箱，手提包，钱包，鞋等物品。就是因为有些动物身上的器官具有突出的经济价值，由此成为被人类掠夺利用的对象，成为动物灭绝的主要因素。所以鳄鱼，现在已经成为快要灭绝的动物了。

朋友们，动物的大量毁灭对人类将产生严重的不良后果，造成生态环境严重不平衡，从而使人类的生存环境遭到破坏。消灭动物，就是在消灭人类自己，如果有一天世界上的动物全都消失了，那人类还能生存吗?要保护动物，珍惜这自然界里的每一个生灵吧!让我们从现在做起，保护动物，使世界变得更加美好吧!

Recently I have seen such a story, the story on the way to save a giant snake women in banda aceh in Indonesias aceh province provincial capital, a woman under the guidance of a serpent, arrived in safety. 26-year-old woman riza said, on December 26, 2004, she lives in a village was flooded with waves, panic in the people running for their lives.

At this time, a female neighbor because of badly wounded, riza, please take your a pair of twins, she then back up the twins. To fight with in the jet stream, she saw a big snake down the flood from the left to swim, she is just like the serpent has been to swim, the results arrived in a safe place. After the event, riza said: "very strange when meet the serpent, I do not feel panic." Moreover, the serpent did not bite them.

Yes, as long as we treat animals, animals will be kind to you, but if you hurt the animals, which hurt just dont know is you a person but a human. In recent years my human destruction of the food chain, all the time and so many animals die because we humans, spirited, extinction. Some even have some rare animals fur to make clothes for money! Some people regard animals as the experiment, according to statistics, there are 2.5 million animals die each year from drug test, in this world, animals are used in shampoo, cosmetics, cancer drug test, although it is not the same with animals, but people and animals have the same right to life, they also have a desire to survive, so human cant go to such a large number of experimenting on animals. Now so many animals came to attack us, because we damage to them, so want to animals will also be kind to you, you will be kind to animals.

最近我看到过一个这样的故事，这个故事讲着一条巨蛇引路救妇女是在在印尼亚齐省省会班达亚齐，一名女子在一条大蛇的指引下，抵达安全地点。26岁女子丽扎说，2004年12月26日，她住的村落被巨浪淹没，慌乱中人们纷纷逃命。

这时，一名女邻居因为受了重伤，请丽扎带自己的一对双胞胎逃生，她于是背起了双胞胎。在与急流搏斗时，她看见一条大蛇从左侧顺着洪流游去，她就跟大蛇一直游，结果抵达了安全的地方。事后，丽扎说："很奇怪，当时见到大蛇，我并不感到惊慌。"而且，大蛇也没有咬她们。

是啊，只要我们善待动物，那么动物也会善待你，但如果你伤害了动物，哪受伤害的就不知是你一个人而是人类。就在近些年来我人类时时刻刻都在破坏着生物链，而因此许多动物都因为我们人类的搏杀而死亡、灭绝。甚至有些人为了钱把一些珍稀动物的皮毛做成衣服!还有些人把动物当成了实验品，据统计每年有250万的动物死于药物试验，在这个世界，动物们被用于洗发水，化妆品，癌症药品的试验，人虽然与动物是不相同的，但人与动物却有着相同的生存权利，它们也有求生的欲望，所以人类不能去这样大量的用动物做试验。现在之所以这么多的动物都来攻击我们，是因为我们对他们的破坏，所以要想动物也会善待你，你就要善待动物。

I have a white dog.Its name is Bobo.She is a female dog.She comes from Beijing,China.She has two big eyes and a small month.She wears white clothes.

She often walks around at home.It has nothing to do.She likes eating ice-cream so much,So do I.When I eat ice-cream,she will look at the ice-cream carefully.So I will give her some to eat.

我家有一只非常可爱的小狗，我很喜欢它。

它有一双水灵灵的眼睛，还有一张粉红的小嘴巴。他走起路来，身子摇摇摆摆的，看起来笨笨的，非常可爱。它是一只全身黑白相间的狮子狗，看起来更可爱更神气了呢!所以我给它起了个名字——旺福。

它刚来我家的时候，还很小，仿佛它对这一切都很陌生，但是，过了一段时间，它变得活跃了，开始是在院子里奔跑，然后又大胆地闯入菜园，把奶奶种的菜全都踩得连腰都直不起来了。奶奶说，它很能吃，是个吃货，一次吃两三块红薯。于是，它在我的印象里更加深刻了。

有一次，我放学回来，远远地就看见旺福在门口等我，我飞快地跑过去，看见它站在那里摇摆着尾巴，像迎接远客一样，见到我活蹦乱跳的，我也开心极了。

我记得有一天晚上，我正在屋子里面写作业，旺福和它的好朋友“小花咪”玩，一会儿，雷声大作，旺福急急忙忙的从外面跑来，汪汪地叫着，我一转身，旺福身上水淋淋的，它好像看见我知道外面下雨了，就连忙往外面跑，站在晒的衣服的下面叫起来，我也跑出去，原来是衣服忘了收了，幸好有旺福提醒我，要不然我就闯祸了。

旺福，我的好朋友，谢谢你!

My favourite animal is the dog.They are so cute ,and are our honest friend.

We have a dog with grey furs and black eyes called Wangwang. Wangwang likes eating.My mother said that hes as greedy as I am.When we are having dinners,he usually crouches (蹲)in the face of us and looks at our food with hungry eyes . At that moment,I always cant help throwing the food in my mouth to him.

Every afternoon when i come back home from shool,Wangwang often runs to me and hug my legs.Hes so happy to see me back.When Im free ,I usually take him to play outside. We run in the field in Spring ,and swim in the river in Summer.Hes my best friend.

I love my dog—Wangwang.

导语：动物是人类的朋友，可是每天都有着很多的动物被人类消灭，但是这依然动摇不了我们保护小动物的决心，下面和小编一起来看看动物英语作文：Snakes。希望对大家有所帮助。

Snakes蛇

The snake is a long and thin animal that lives in grass or other dark places. A snake has no legs or feet, but it can move very fast on its stomach. Snakes usually have green, yellow or black skins, which make them difficult for their enemies to find them.Some kinds of snakes live in water. They can swim as freely as fish.

蛇是一种又长又瘦的动物，生活在草丛里和阴暗的地方、蛇没有腿和脚，靠胃部飞快的移动前进。 蛇常常有绿色，黄色和黑色的皮肤，使得敌人很难找到他们。

Snakes are cold-blooded animals. In winter they hibernatein holes which are narrow enough only to hold the snakes bodies. The snakes can sleep through a whole winter without eating and moving. They can not feel any pain. The hibernation period lasts about five months. When spring comes, the snakes come out and begin their normal life.

蛇是冷血动物，在冬天，它们通常隐藏在只能容下它们身体的狭小的小洞里。蛇可以不吃东西，不移动地睡一整个冬天。它们不会感觉到痛苦，它们的隐藏时期持续大概5个月。当春天来临的时候，蛇就会出现并开始它们的正常活动。

Snakes can take many things as food, such as mice, sparrows, frogs,birds eggs, pests and so on. People sometimes can see a snake eat a sparrow. First it moves close to the sparrow, then it puts out its tongue and brings the sparrow into its mouth and swallows it, which makes a lump in the snakes body. After some time the lump disappears.

许多东西都可以成为蛇的食物，就像老鼠，麻雀，青蛙，鸟蛋和害虫等等。人们常常看见蛇吃麻雀，蛇首先靠近麻雀，然后伸出它的舌头把麻雀带进它的嘴巴里并吞下去。麻雀就像一块肿瘤一样突出在蛇的身体里，但是过了一段时间就会被消化消失。

As snakes are dreadful-looking, people are afraid of them. Many people drive them away whenever they see snakes. But in Chinese fairy tales, snakes are by no means bad. They seem to have human feelings. They can change into pretty girls. People like and respect them. The most well-known is the story about the White Snake and the Blue Snake.

因为蛇看起来很可怕，所以人们总是害怕它们，很多人每当看到蛇的时候都会把它们赶走。但是，在中国的神话故事里，蛇并不代表坏人，它们可以感觉到人类的想法，它们会变成美丽的女生，人们喜欢和尊重它们。最著名的故事就是白蛇与青蛇的故事了。

In fact, snakes are not as dreadful as they look. They can help us to kill mice and pests. They can provide us with delicious meat. Their blood is a good drink. Poisonous snakes are especially useful. We can make valuable drugs with them.

事实上，蛇并不是像它的样子那么可怕，它们可以帮助我们杀死老鼠和害虫，它们可以给我们做成美味的佳肴，它们的血是很好的饮料。毒蛇就特别有用处了，我们可用它们做成珍贵的药品。

[动物英语作文：Snakes

I have many cousins. I like Stella best. She is a pretty girl. She likes eating cucumbers , eggplants, cabbages… She doesn’t like eating eggs and milk. So she is very short.

Stella is an excellent student . She is the monitor of her class. She likes studying and she studd. So she is always the top student in her class.

In this summer holiday , I spent a very happy time with her in Sichuan . I often miss her very much.

I like my cousin best!

there are four seasons in a year. they are spring, summer, fall and winter.spring is warm and sunny. the trees are green and flowers are beautiful. we can plant trees and run on the grass.

summer is my favorite season. the weather is very hot, sometimes it rains. I like to swim in the swimming pool. and I can wear my beautiful dress. and I can eat ice creams.fall is a beautiful season. the weather is very cool. we can eat a lot of fruits. and the leaves are colorful.

winter is very cold. but in nanhai it does not snow. we can not play with snow.

I like the four seasons very much.

One afternoon, it rained heavily, the sky the day, the monitor xiaoli is just about the students to go to the little red house open birthday party, but the heavy rain stop the footsteps of the small beautiful.

Dad came over, told her not to go to, said: "such as the leaching disease."

Xiao li said: "I must go to the birthday party, because before they please I go you always dont allow me to say, its too far, afraid of the danger, so, Ive been didnt go. I have promised them this anyway must go!" Say that finish, small beautiful heavy rain rushed to the little red house, as she ran to the middle, found gift fast wet, so she take off his coat, cover to present, in the look at the time, ah! Time is coming, small beautiful with their fastest speed run to the little red house.

When xiao li to all of the students come together, when students know that xiao li why come so late, have appreciated she is an honest good monitor, take the lead.

Since then, the students as long as there are difficulties, went to xiao li.

Honesty is a good quality, good faith can bring you happiness, can let the others to you very trust, make your life full of other peoples trust.

一天下午，天空下起了大雨，这一天，班长小丽正好约了同学去小红家开生日聚会，可是大雨阻挡着小丽的脚步。

爸爸过来了，劝她别去，说：“等下淋出病来了。”

小丽说：“这个生日聚会我一定要去，因为以前他们请我去你总是不让我去说，太远了，怕出危险，所以，我就一直没去。我已经答应他们这次不管怎样都一定去了!”说完，小丽冒着大雨匆匆跑去小红家，当她跑到一半时，发觉礼物快湿了，于是，她把自己的外套脱下来，盖到礼物上面，在看看时间，呀!时间快到了，小丽以自己最快的熟速度跑去小红家。

当小丽到的时候，同学们全都来齐了，当同学们知道小丽为何那么晚来，纷纷赞赏她是个讲诚信的好班长，好带头。

从此以后，同学们只要有困难，就去找小丽。

诚信真是一个好品质，诚信可以给你带来快乐，可以让别人对你非常信任，让你的生活充满别人的信任。

大森林世界在人类世界只有一个入口——奇妙小学。每一年奇妙小学都会有几位小朋友被挑选出来在老师的带领下前往浩瀚无边的大森林进行冒险旅程。

今年是东东老师和他的四位学生——小飞、小西、小花和小丽，这一次大家的目的地是森林艺术馆！他们为这一次探索感到既兴奋又紧张。在一个风和日丽的早晨，阳光尽情地洒在大地上，真是个难得的好天气！他们小心翼翼地通过入口，终于到了！

“大家好！欢迎光临大森林世界！这里是森林艺术馆！”广播里传来温柔可爱的声音，缓解了大家紧张的心情。

艺术馆四周都是晶莹剔透的玻璃，透过玻璃就可以看见茂密的森林和可爱的小动物们。我们还看到了书架上整整齐齐地排列着各种各样的书籍，这里有任何与森林相关的故事。这里还有一架古老的钢琴，东东老师坐在钢琴前，手指不断敲响着琴键，美妙绝伦的音乐在耳边回响，小西就不自觉地跟随着悠扬的音乐手舞足蹈起来，她的脸上带着微笑，在转圈时，一头乌黑的长发顺着她的动作也飘了起来，像是一只美丽的花蝴蝶在空中飞舞。

小花倚靠在钢琴旁，跟随着悦耳动听的钢琴声轻微地摇摆着自己的头，甚是陶醉！小飞去哪儿了呢？原来他正吹着自己的长笛坐在外面的台阶上，给东东老师伴奏呢！他们的美妙乐声吸引来了许多小动物，有活泼可爱的小白兔、有歌喉动人的百灵鸟、还有爱吃松果的小松鼠们……

所有的小动物们都加入了这场热闹的“音乐会”，“歌唱家”百灵鸟更是禁不住唱起歌来，它的高音让小朋友们赞叹不已，大家都还意犹未尽，这场音乐会真是太美妙了！他们都开怀大笑起来！

正在这个时候，东东老师发现入口马上就要关闭了，大家必须马上回去，否则就只能留在这里了。孩子们依依不舍地和动物们告别，和它们紧紧地拥抱在一起。虽然音乐会结束了，探险旅程也结束了，但是大森林世界的广播里永远会响起他们的这一段合奏！

多么奇妙的旅程啊！多么美妙的音乐啊！多么有趣的故事啊！人和动物相处多么和谐啊！

在一个阳光明媚的早上，小燕子拿着麦克风站在舞台上说：“亲爱的女士们，先生们，你们好！我是今天的主持人，小燕子。今天有许多选手为你们送上一支支动听的歌曲，请你们欣赏。下面有请1号选手，麻雀先生为我们带来《喳喳曲》。”

“喳喳－喳喳－喳喳喳。”麻雀先生唱着美妙的歌曲。麻雀刚唱完，舞台下立刻响起一片热烈的掌声。麻雀先生高兴地走下了舞台。小燕子又走上了舞台，拿起麦克风笑着说：“下面有请2号选手森林歌王，百灵鸟小姐出场。她为我们带来一首歌《春天在哪里》，请大家鼓掌欢迎！”

百灵鸟得意地唱着：“春天在哪里呀，春天在哪里……”小动物们在美妙的歌声中陶醉了。很快，美妙的歌曲唱完了，小动物们鼓起了掌声，并说：“好！好！唱得好！”百灵鸟又得意又自豪地走下了舞台。

接下来分别还有许多歌手的表演：有狐狸，小熊，孔雀等等。它们的表演都非常出色，都能得到小动物们的掌声。到了小乌鸦唱歌了，小乌鸦等到脖子都长了

。小燕子说：“下面有请10号选手小乌鸦为我们带来《啦啦曲》。”小动物们一听到小乌鸦要唱歌了，连忙塞住耳朵不听。

“啦—啦—啦啦啦—啦—啦—啦啦啦……”小乌鸦唱起了好听的歌曲。小动物们慢慢松开塞住耳朵的手，渐渐陶醉在好听的歌曲中，有些小动物还跳起了舞。“啊！真好听！”小动物们说。小乌鸦唱完便有礼貌地鞠了一个躬，说：“谢谢！谢谢大家！”小动物们纷纷鼓起了热烈的掌声。一只小松鼠走上了舞台，送了一束花给小乌鸦，小乌鸦高兴极了。

从此以后，动物们每天都要听小乌鸦唱歌，小乌鸦觉得无比的快乐。

这个故事告诉我们：不要看不起别人。每个人都有各自的长处和短处。

大自然是人类最好的老师。从大自然中我们可以发现许多奇妙的现象。这些现象和我们的生活息息相关。

我从猫的身上得到了一个启示：为什么猫走路没声音?原来猫的脚掌上有厚厚的肉垫，走起路来不容易发出声音;猫走路的时候，脚是“点起”“点落”和轻起轻落，足跟软软的肉垫轻轻地落地，就不会发出声音。所以猫走起路来一点声音都没有。

我想发明一种像猫爪子一样的鞋子，下面有厚厚的棉花垫，这样走路就不会发出声音了。在医院里，护士们都穿这样的鞋子照顾病人，就不会打扰病人休息。

我们发现壁虎的手脚很有吸力，可以在墙上行走，也不会掉下来。我想发明一种像壁虎手脚那样的吸盘，携带起来很方便，只要有墙壁，就能吸在上面。这样妈妈在院子里晒被子、晒衣服，都很方便。还可以做成带吸盘的鞋子，人们穿上这样的鞋子，在刷油漆的时候，就不用搬梯子，可以在墙上自由的走动，也不会掉下来。

我以后要仔细观察身边的事物，多发明一些对人类有帮助的东西，让我们的生活变得更美好。

[三年级作文动物的启示

I am a middle school student. I am active. I like going out to play.

Recently, I am fond of skating. I want a pair of skating shoes, but my mother doesn’t allow, because she worries about me to be hurt in playing. So, I want to find a part-time job to earn money to buy a pair of skating shoes. I am always free at weekends. During the weekday, I think I can’t have spare to work. I am tough and I am willing to do everything I can do.

Anyone has the information about part-time job, please recommend to me.

我是一名中学生。我很活泼开朗。我喜欢出去玩。

最近，我迷上了溜冰。我想要一双溜冰鞋，可是我妈妈不允许，因为她担心我会受伤。所以，我想找份兼职来挣钱买一双滑冰鞋。周末我一般都是有空的。星期一到星期五，我觉得我没有多余的时间工作。我很能吃苦耐劳的，而且我愿意做我能做的任何工作。

谁有关于兼职的信息，请向我推荐一下。

Environmental protection needs the maintenance of all of us. Only if we are active to maintain. Our environment will become better.

Once, father, mother and I go to the park for a walk, just going to the park to see some of the white plastic bag fell to the ground, is very obvious. "The litter is not civilization", my in the mind in blame them. My eyes are bright, by the way, I am a little green guards, should take good care of the environment. I bent down and picked up to throw garbage into the trash. Mother said: "with the hand to pick up more health, with branches clip". So, I use two branch, with his hands a clip, garbage will obediently followed I go. A bridge, lets go to the park to see rubbish was strewn all over the grass, cleft. As they walked along, I pick up. Went to the amusement park, at first glance I saw a white stone chair plastic bags, they like a terrible enemy attack us. I run to get rid of them one by one all. I found on the lake and some white plastic bags, Ill give it all up, but, I catch a have a plastic bag, dad said: "let me help you." So, my father took my hand, I go to pick another hand holding a branch, finally got the scoop up plastic bags. I like the battles of soldiers happy.

Though today just me and my parents clean up the garbage, but I believe that people will take good care of the environment, there will be more people to do the green small guard.

环保需要我们所有人的维护。只有大家都主动去维护。我们的环境才会变得更好。

有一次，我和爸爸、妈妈去公园散步，刚走进公园就看见了一些白色的塑料袋落在地上，非常明显。“这些乱扔垃圾的人真是不文明”，我心里在埋怨他们。我眼睛一亮，对了，我是绿色小卫士，应该爱护环境。我就弯下腰捡起垃圾往垃圾桶扔。妈妈说：“用手捡多不卫生呀，用树枝夹”。于是，我用两根树枝，双手一夹，垃圾便乖乖地跟着我走。我们走到公园的一座桥，看见草丛、石缝到处是垃圾。我一边走一边捡。来到了游乐园，我一眼就看见石椅子上有白色塑料袋，它们像可怕的敌人一样攻击者我们。我跑过去把它们一个个都消灭掉。我又发现湖面上还有一些白色塑料袋，我就把它们都捞上来，可是，有一个塑料袋我捞不着，爸爸说：“我来帮你。”于是，爸爸拉着我的手，我另一只手拿着树枝去挑，终于把这个塑料袋捞了上来。我像打了胜仗的士兵一样高兴。

虽然今天只有我和爸妈在清理垃圾，但我相信，人们一定会爱护环境，会有更多人来做绿色小卫士的。

Every time I go to the zoo, I was always against the stream of people, into the gate, and then turn left, go to see my favorite big bird - a swan

Sunday morning, I have to go to the zoo with mom and dad. Chardonnay at the beginning of the red fire that day, the lake calm a swan in the water, they beat their broad wings, and over the red sun.

Swan with a white feather, looks very beautiful. They quite on the surface of the lake and swam slowly, the calm water of the lake like a bright mirror, reflected the difficult they figure, like a pair of players in two-way dance, dance, dance music that I can not help but want to talk about a swan, the music for them. Swim a son, may be tired, then into the shore to rest, the tree house is the home of the swan. In this beautiful green lawn, they quietly watching from a distance, as if a snow.

I love swan, swan is love beautiful symbol. Many writers have written the story of the swan, like Anderson grandpa write a fairy tale... See a swan, I as if into a fairy tale world.

我每次去动物园，我总是逆着人流，一进大门，就往左拐，去看望我最喜爱的大鸟-天鹅

星期天的早晨，我又和爸爸、妈妈一起去动物园。那天霞火初红，湖水平静一对天鹅在水面划过，他们拍打着宽大的翅膀，托出了红艳艳的朝阳。

天鹅长着一身雪白的羽毛，显得格外美丽。它们在湖面上娴静得、慢慢地游动着，那平静的湖面像一面明亮的大镜子，倒映出他们那高难度的身影，就像一对舞蹈队员在跳双人舞，使我不禁想谈一首天鹅舞曲，为他们伴奏。游了一儿，也许是累了，便进岸边休息了，树下的房子就是天鹅的家。在这美丽的绿色草坪上，他们静静的望着，远远望去，仿佛是一座雪雕。

我爱天鹅，天鹅是爱美的象征。许多文学家都写过天鹅的故事，好比安徒生爷爷写的童话......看到天鹅，我就仿佛进入了童话世界。

my pet is a toy bear. his name is small white. he is white. he has blue eyes and blue ears. his hands and feet are blue too.he is naughty.

he likes to make fun of me. he likes reading.

when i am unhappy, he accompanies me.

he is my good friend.

A triple bacon cheeseburger seems like a heart attack on a plate.

三层奶酪咸肉汉堡感觉吃完很容易让人突发心脏病。

So how can polar bears thrive on their version, seal blubber?

那么,北极熊是如何处理这些高热量食物的呢?

Turns out theyve stocked up on genes that let them clear fats from their blood.

结果显示它们储存在遗传基因里的信息使得它们能够清除血脂。

Thats according to a study in the journal Cell.

这是根据《细胞》杂志上的一篇研究得出的结论。

Polar bears are well adapted to life on the sea ice.

北极熊非常适应在浮冰上的生活。

Up to half their body weights fat, which gives them extra insulation and buoyancy, and provides them with a ready source of energy.

几乎占它们身重一半的脂肪足以使它们保暖并且维持体力，提供给它们一种易转化的能量。

But how can an animal so fat also be so fit?

但一种动物怎么能又胖又健康?

Researchers compared the genomes of polar bears with those of brown bears, and found that polar bears have accumulated genetic changes that boost their heart health and fat metabolism.

研究人员们通过比较北极熊和棕熊的基因，发现北极熊的基因组中积累了不少有利于心脏健康和脂肪代谢的遗传突变。

One gene in particular, called ApoB, helps move cholesterol out of the blood—where it causes problems in humans—and into cells.

特别是编码为载脂蛋白B的基因有助于清除血液中对人类有害的胆固醇转变成细胞代谢。

These genomic changes happened quickly, evolutionarily speaking.

这些遗传变化从进化的角度来讲发生的十分快。

Polar bears and brown bears diverged from a common ancestor less than half a million years ago.

北极熊和棕熊都来自于同一个祖先，它们是在大约50万年前左右开始向不同分支进化。

But if that seems super speedy, the ability to digest lactose didnt spread through human populations until we domesticated cows, just 10,000 years ago.

但是如果这种变化看上去十分快速的话，消化乳糖的酶逐渐进化到人类各个种群中也还是发生在大概1万年前我们可以驯化乳牛之后。

A moooving testament to the power of natural selection.

这是自然选择力量的证明。

I have a cat .Its name is Mimi. Its very lovey.My family all like it.

It always plays with me every day .It has black and white fur.As long as we sayMimi,It right away runs to you.

Its very good!so My family all like it!

“叮铃铃……”上课铃声响了，一个靓丽的身影闪进了教室，她就是我们的老师，还是我的班主任。

她不但身材婀娜多姿，长得皓齿内鲜，明眸善睐的，名字听着也好听，叫乌云塔娜。她是蒙古族人。她的个子虽然稍矮一些，可在我的心目中却无比的高大。

如往常一样，小组报告作业，然后由老师一个个教训。我们拿出昨天留的作业，老师又一张张展示在讲台上、判分。不愧是班长，语文和数学卷子都对了，英语也是满分，我羡慕不已。老师把我的卷子拿过去审阅，作文每次写的都不错的我，这次竟然也像吃错药了似的作文的条件不够好，老师严肃地对我说：“姜惠文，你偷懒了吧？多背范文！”一句斩钉截铁的话，吓得我有个地缝都能转进去，我苦笑了一下算是默认了。老师开始讲课，可是，总有几个同学不注意听讲，要么偷偷地闲聊，再不就是看课外书。老师的脸顿时冷若冰霜，仍耐住性子说：“请注意，我在给你们讲课，能尊重一下您自己吗？”教室里一下鸦雀无声。

我的老师就是这样，和我们有时如春天般的温暖，有时冷若冰霜。有时惹得她狂风骤起，一会又风平浪静。有时被学生气的泪水涟涟，有时和我们兴高采烈地。我们和老师就在这阴晴之间，走过了一天又一天。无论怎么样，老师对我们的辛苦付出是有目共睹的。还有半年我们就要升入初中了，我更加珍惜这段时光，和老师共同度过，留下美好的记忆。在此向老师道一声：“亲爱的老师，您辛苦了！”

Do you know of any endangered animals? Why are they in danger? I think there are many endangered animals in the world, such as tigers and pandas. When farmers cut down trees, tigers can no longer hide and hunt. Many tigers are killed by people who want to sell their fur for money. And there are few places where pandas can live. We are not alone in the world. We human beings could not live without all the plants and animals around us. So protecting wildlife animals are very important. We must take measures to keep plants from being destroyed and stop animals from being killed. If each of us can plant a tree and build a birdhouse, the world will be more beautiful. It is very easy but useful.

你知道任何濒危动物吗?他们为什么处于危险中?我认为世界上有许多濒危动物,如老虎和熊猫。当农民砍伐树木,老虎再也无法隐藏和狩猎。很多老虎都被那些想要出售他们的毛皮。,很少有熊猫生活的地方。世界上我们并不孤单。我们人类离不开我们周围所有的植物和动物。所以保护野生动物是非常重要的。我们必须采取措施防止植物被破坏,阻止动物被杀。如果我们每个人都可以种一棵树和建立一个禽舍,世界将会更美丽。它非常容易,但很有用。

When the Arctic Ocean freezes over in the autumn, polar bears set off in search of their favorite meals: fatty ringed seals and bearded seals. By the summer, the sea ice begins to melt and break apart. Deprived of access to the tasty seals, polar bears spend the summer fasting. At least, thats whats supposed to happen. As the planet warms, the warmer ice-free season is getting longer and longer. So whats a hungry bear to do?

Scientists once thought that polar bears might survive by supplementing their pinniped diet by turning to terrestrial foods like snow geese, their eggs and caribou.

"Weve had this debate in the literature about whether terrestrial foods are nutritionally relevant to polar bears during the on-land season when the ice has melted."

University of Alberta biologist Nick Pilfold.

"And weve known for a long time, going back to research in the early 70s, even going to back to early explorer logs, that polar bears will consume terrestrial based foods. But the debate was always whether those foods actually add up, energetically." In other words, do these substitutes provide enough nutrition to make up for the lost seals?

To find out, Pilfold and his colleagues estimated the weight lost each day by polar bears in the wilds of western Hudson Bay during the ice-free season, when they could ostensibly be chowing down on terrestrial foods. Then they compared that to the weight lost by bears that are temporarily held in Manitobas Polar Bear Alert Program.

While captive, the bears do not eat. They drop about one kilogram each day. But the wild bears, who had access to the Arctic snack bar, lost the same amount of weight each day. The results are in the journal Physiological and Biochemical Zoology.

"Which is really saying that the terrestrial foods do not have dense enough energy to offset the mass loss. So this idea that bears can just switch from eating sea ice–based food to land food and thats going to help supplement against longer ice-free seasons, that really doesnt show up in the data."

The problem is that polar bears evolved to rely on the marine diet.

"The food on land is protein and carbohydrate based, and the food the polar bears really focus on is fat. Fat is the name of the game for these bears; theyre highly adapted to absorbing that fat into their system and putting it onto their body as body mass, so they can fast on it later on. And the only thing thats going to provide them with that type of fat are marine mammals. And they can only access those marine mammals when theres sea ice."

Adult males can go eight months without food. But younger, sub-adult bears, which are no longer nursing and must hunt, cant last as long without sea ice. So as the Arctic warms, younger polar bears will disproportionately die out. Leaving the species survival in doubt.

北冰洋在秋季结冰以后，北极熊就会出发去寻求它们最喜欢的食物：富含脂肪的海豹和胡子海豹。海冰在夏季开始融化断裂。这使北极熊在夏季无法吃到美味的海豹，所以它们进入禁食期。至少，情况应该是这样。但是由于地球变暖，温暖的无冰季节越来越长。那饥饿的北极熊要怎么办?

科学家曾经认为，北极熊可能会转向陆地上的食物来补充它们对鳍足类动物饮食的需求，进而生存下去，这些陆地食物包括雪雁、雪雁蛋和北美驯鹿。

“文献中有过这类辩论，即在寒冷融化时陆地食物是否能满足北极熊的营养需求。”

尼克·皮尔福德是加拿大阿尔伯塔大学的生物学家。

“通过上世纪70年代初的研究，还有早期的探险者日志，我们很早以前就知道，北极熊会以陆地食物为食。但是辩论的焦点在于，这些食物是否能增加北极熊的能量。”换句话说，这些替代食物能否为北极熊提供足够的营养，弥补不能进食海豹带来的损失?

为了解开这个疑惑，皮尔福德及同事对西哈德逊湾荒野地区的北极熊在无冰季期间每天失掉的体重进行了估算，从表面上看，北极熊在这段时间食用了陆地食物。随后，他们将这一数据与通过马尼托巴北极熊预警计划暂时捕得的北极熊所失掉的体重进行了对比。

在被关期间，北极熊不吃东西。它们的体重每天大约下降1公斤。虽然野生北极熊能享用北极“小吃”，但是它们的体重每天也同样会下降1公斤。这一研究结果发表在《生理学和生化动物学》期刊上。

“显然结果表明，陆地食物不能为北极熊提供足以抵消大量损失的能量。所以，北极熊可以从食用海冰下面的食物转向食用陆地食物，并帮助它们对抗日益延长的无冰季这个观点，并没有在这项数据中得到证明。”

问题是，北极熊进化成了依靠海洋食物的动物。

“陆地食物以蛋白质和碳水化合物为基础，而北极熊需要的食物以脂肪为主。脂肪是这些熊真正需要的东西;它们高度适应的情况是，将脂肪吸收进它们的系统中，然后把这些脂肪放在身上以增加体重，这样它们之后就可以依靠这些脂肪来度过禁食期。唯一能提供给北极熊这种脂肪的就是海洋哺乳动物。但是它们只能在有海冰时食用到这些海洋哺乳动物。”

成年北极熊可以8个月不进食。但是小一些的未成年北极熊已经不再被哺育，它们必须要去猎食，可是它们不能在漫长的无冰季期间一直不进食。所以，随着北极地区变暖，较小的北极熊将会大批死亡。这使这些物种的生存成为问题。