我最喜欢的动物是狗狗英语作文通用20篇

animals are natural resources that people have wasted all through our history. animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way. thousands of kinds of animals have disappeared from the earth forever. hundreds more are on the danger list today. about 170 kinds in the united states alone are considered in danger.

why should people care? because we need animals, and because once they are gone, there will never be any more.animals are more than just beautiful or interesting. they are more than just a source of food. every animal has its place in the balance of nature. destroying one kind of animal can create many problems. for example, when farmers killed large numbers of hawks, the farmers` stores of corn and grain were destroyed by rats and mice. why? because hawks eat rats and mice, with no hawks to keep down their numbers, the rats and mice multiplied quickly.

luckily, some people are working to help save the animals. some groups raise money to let people know about the problem. and they try to get the governments to pass laws protecting animals in danger. quite a few countries have passed laws. these laws forbid the killing of any animal or planton the danger list. slowly, the number of some animals in danger is growing.

去年暑假，爸爸妈妈带着我回北京看望奶奶和姑姑一家。向往已久的祖国首都北京太美了!游览的首站我直接挑了——北京，专门去看了我最喜爱的小松鼠。

松鼠是一种讨人喜欢，美丽的小动物。它四肢灵活，行动敏捷得惊人;一对闪闪发光，骨碌碌转的小眼睛格外有神;身上那灰褐色的毛光滑得好像搽过油;那条毛茸茸的大尾巴更是引人注目，特别的漂亮。

松鼠喜欢在树枝上蹦来蹦去的，它们总是在高大的老树的树叉中间搭窝。它们好像害怕强烈的日光，白天时常躲在窝里。松鼠爱吃的食物是松子和榛子，资料显示它们有时候也吃鸟蛋和昆虫，它们吃东西是用前爪捧着往嘴里送。

松鼠还是个勤劳的小动物，总是在秋天时候就开始储藏过冬的食物。它们非常聪明，懂得在树上嗮食物不让食物变质烂掉。下面这首歌谣说的就是小松鼠嗮食物：

森林里面有大树，

大树下面有小树，

小树下面有蘑菇，

小小松鼠采蘑菇，

采了蘑菇上小树，

顺着小树上大树，

大树上面嗮蘑菇，

森林是座大仓库。

松鼠是我们人类的好朋友!我痴迷地喜欢它。小松鼠活泼可爱的样子不时会出现在我的梦乡……

我喜欢的小动物三年级作文【篇五】

我喜欢的动物有小熊猫·小狗·小猫·小海豚等等各种动物，但我最喜欢聪明可爱的小狗。

它有明亮如星星的眼睛，灵敏的鼻子，毛茸茸的耳朵，不停地摇晃着尾巴，可爱极了!

一次，我去奶奶家，那里“蹲”着一只特别小的小狗，我就同它玩了起来，它正追着我，谁知脚下有一块石头把我绊倒了。我伤心的哭了起来，它赶快跑过来对我汪汪直叫，不停地安慰我，我忍着痛回到了屋里。于是，给它取名为“安安”，因为它在别人伤心的时候会安慰他们。

还有一次，我拉着它去散步，我们走走说说笑笑，还在广场上玩抛球，跳绳等等，玩的特别开心。我们回到家，妈妈刚好做完了饭，我们吃的津津有味!

我特别喜欢——“安安”!

dog is my favorite animal among all the animals.As we all know,dog is a lovely animal.i love it not only because of its cute shape,but also because of its loyalty.it will never betray its master.another reason why i love dog is that dog can make me happy.when i am sad,it will do everything he can to cheer me up and forget the unhappy things.so i will love dog for ever and ever.

Panda—the National Treasure

Panda is one of the scarcest animals.People in the world like it very much.There used to be many pandas in China long ago.As the balance of nature was destroyed and the weather was getting warmer and warmer,pandas became less.But at present,the number of pandas is increasing year by year.There are now so many pandas that some are being sent to other countries so that people there can enjoy them.

Nowadays,the biggest nature park for panda in China is in Sichuan.There is a research centre for nature and wild life there.Scientists hope that one day they will have enough pandas to be set free and let them live in the wild again.

我最喜欢的小动物，还属小猫。

呵呵虽然只有半尺多长，但很胖，浑身黑白相间的毛，头顶有个圆圆的白点，两只耳朵和四只脚都黑黑的，还有一双炯炯有神的大眼睛很讨人喜爱。爸爸见它睡觉总发出微微的声音，便给它取名“呵呵”，我和妈妈一致赞成。从此，我家就添了新成员——呵呵。

呵呵可淘气了。家里养最担心的是它的大小便，呵呵到家后便培养它到卫生间的专用盆大小便。不料，呵呵每次都跑到邻居家门前，往别人簸萁里大小便，邻居便登门告状，禁止呵呵去别人家簸箕里大小便。在我的精心指导下，它养成了大小便去卫生间的好习惯。一个星期天，呵呵趴在沙发上睡觉。一会儿，我见它醒了，抖了抖了毛，下地到卫生间的盆里解小手，又慢慢地走回刚才睡觉的地方接着睡起来。我和妈妈见了一致夸它说：“呵呵真懂事，像个小大人似的，自己会独立去卫生间了。”

花臭的到来，为我们家带来了欢乐。每天晚饭后是与呵呵游戏的时候。我们教它玩飞碟。我和爸爸站在不同的地方，飞出去的时候叫它去捡，它总是捡我的，不捡爸爸的，尽管我很生气，但还是被它那认真劲逗得大笑一场。

过了不久，我们该搬新家，担心毁坏家具，便把它送给了别人。呵呵走后，我们家里经常讲起它的故事。

我喜欢的动物是猫。姑妈家有一只黑白相间的小猫，我给它取名“小花”。“小花”很可爱、很萌、很听话。每次我喊它“小花”的时候，它好像听懂了我在叫它一样，就笑眯眯地回应我一声“喵”。从那开始我就喜欢上了它，把它当成了我的一个小玩伴。

每一次去姑妈家，我和弟弟一起跟“小花”喂食，“小花”吃鱼肉吃得可香了，和小白兔吃胡萝卜一样。我和弟弟把鱼肉放进它的碗里，走开了一小会儿，再过来看时，我惊呆了，我情不自禁地叫了一声“天哪”，弟弟诧异地望着我，我自言自语道：“小花”居然在这么短的时间能把那么大的一块鱼肉吃了一个精光，弟弟捂着嘴哈哈直笑，从他的笑声里，我明白了“小花”都是这样吃鱼的，吃得又快又香，可爱极了！

“小花”还有很多特点，它极会捉老鼠。姑妈家住在郊区，房子四周都是菜园，所以屋子里偶尔有老鼠串过。有一天，我和弟弟在搭积木，突然听见温和的“小花”大叫一声，我和弟弟的目光被这一声“喵”成功转移，原来一只老鼠正从大门口串了进来，只见“小花”眼睛睁得大大的，胡子似乎都竖了起来似的，尾巴翘起，伸开尖锐的爪子，像一位勇士一样猛扑过去，一下子就把想安居在姑妈家的老鼠捉了个正着。“小花”捉老鼠的情景还真是让我大开了眼界。

我喜欢姑妈家的“小花”，它带给了我无穷的快乐！

我家养了一只小狗，名字叫bign，我很喜欢它。

Bign长着一对水灵灵、蓝宝石般的大眼睛，胡须长长的，身材不胖不瘦，毛是白色的，它每天都穿着我亲自为它做的“灰姑娘”衣服。

它很可爱，也很调皮。

先说可爱吧!有一次我考试不及格，很伤心地回到家，bign突然跳到我身上，舔了舔我的脸和嘴，还汪汪叫了几声，像是在说：“主人，别难过，别灰心，下次再努力!”看到bign那可爱的神情，我一下子忘记了伤心。

再说调皮吧!有一次我带着它去踢球，我踢一个，它接一个，玩了很久我想回家了，它不肯，像是在说：“多玩一下好吗，主人?”我也不答应，后来我把它抱回家，它在我鞋子里撒尿，还把我的被子咬得稀巴烂，我很生气，想把它揍一顿，可是bign躲在一个角落里，表情可怜巴巴的，我就不忍心去揍它了。

Bign喜欢吃狗粮和骨头，我每次喂它吃东西时，它都会抬起手，像是在对我表示感谢!

我喜欢这只调皮可爱的bign!

Animals are people friends,they believe that human not to hurt people.But people are constantly harm to them.

We shouldnt do it.We are now protected animal,make it not hurt,to serious blow the killing animals.Because -- we are animals ah,senior animals.If we were to slaughter,and our family?It is the same with animals!

Because we are a family,so please everyone together to protect animal!

I like animals very much, such as horses, monkeys, cats, tigers and so on. But I like dogs best. Why? Because they are very cute and friendly.

我非常喜欢动物，比如马，猴子，猫，老虎等等。但是我最喜欢小狗。为什么呢?因为他们很可爱很友好。

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.

我有一只白色的小狗。它的名字叫波波。她是一只小母狗。她来自中国北京。她有一双大眼睛和一个小嘴巴。她穿着白色的衣服。 她经常在家里到处走。但是没关系。她喜欢吃冰激凌，我也是。当我吃冰激凌的时候，她就会很认真的看着冰激凌。所以我会给她一些吃。

I think Bobo is the cutest dog in the world.

我觉得波波是世界上最最可爱的狗狗。

Animals are our best friends. But there are many bad things about them. So we should try our best to protect animals.

First, let us know the status of the animal. Now, animals are facing very great danger. For example, there are many kinds of animals will die out. And there are many people eat precious and wild animals. They are nasty. As students, we should stop this behavior and protect animals.

Then, let us know we should how to protect animals. We should protect they habitat. If you see other people mindlessly trample animal homes, nicely remind them of the damage theyre causing. We can not also eat some wild animals. We should ask other people to protect them, too. Let we protect animals together!

吴新雨

我喜欢的动物有很多，比如黑白相间的大熊猫，小巧玲珑的仓鼠活泼可爱的金鱼……其中，我最喜欢的就是小猫了。

小猫的名字叫喵喵，它个头不高，妈妈说，它才五个月大。它有一身洁白如雪毛，软软的，亮亮的，让你忍不住想去摸摸它。圆圆的脑袋上竖着两只三角形的耳朵，大的眼睛水灵灵，小小的鼻子和一个樱桃小嘴，真是可爱极了。

别看它小，它可是一个大胃王呢！记得有一次，我拿着一条小鱼，给喵喵吃，我走到喵喵身旁，它猛的扑上来，吓的我把鱼扔在地上，还往后退了几步，只见喵喵叼起鱼，大口大口的吃了起来，我在心里想快吃吧！时间久了，我也习惯了，每当我给喵喵喂食物时，喵喵看见了，就站在我的面前，喵喵地叫，好像在说“小主人，小主人，我饿了，快给我吃吧！”每当喵喵吃食物时，我总会摸摸它的小脑袋，它会抬起头望着我。

这就是我喜欢猫的原因，你们喜欢吗？

I like the small animals is pure white cat, it whole body white hair like snow let me very love, its eyes narrowed into a crack during the day, night round, like two emeralds. His ears have been up, as long as you move, his ears will move; His hearing is very agile, as long as people walk on by, it will be called "meow"; Its teeth are very hard, and spiky, eating up to very easily, I like it very much.

Remember once, my brother come to my house to play, the kitten, enthusiasm has been rushed brother "smile". Brother see him so lovely, then come up with a very thick wool, want to know the cat likes to play with wool, yarn in hand, brother cat followed, wool from turning in the past, the cat rushed over, not caught, himself closed on empty air, my mother and I laughed, cat is a little angry, brother, in a piece of cloth, bend, kitten, and save the empty, this is brother became a "bucket" cat. Brother and five stool was placed in a row, put the wool in stool to mouth, cat rushed over, to bite the yarn, I cheered for it, and happy for it.

If winter comes, I built a warm nest to the Kitty, it was very happy. Whenever I go home from school on the stairs, the cat is lying on the sofa waiting for me, I entered, it smile on his face became a flower. See I bought it, eat happily licks my hand, very enthusiastic!

One day, my father told me: "you see, a dog is loyal, treacherous court official but the cat." I try so hard, favour say: "the cat is my favourite animal, treacherous court official it isnt!" Mom came running when the referee, set each write like cats or dogs 5 reason, then the evaluation of high and low. I brush flash, 1, I like cats; 2, the kittens fur is very smooth; 3, the cat is very sincere to me; 4, the cat is very lovely; 5, the cat is very clever. Just finished writing, I looked up to see dad, ha, he wrote two, we all handed over after the volume, the referee on the grounds that the father wrote the word much, the father victory. I am very defy spirit, I believe that I will lovely kittens are guardians forever!

Kitten, naughty, lovely, he brought happiness to my life, no matter what, my favorite animal is cat!

我喜欢的小动物是纯白色的猫，它全身白似雪的毛让我无比喜爱，它的眼睛白天眯成一条缝，晚上圆溜溜的，活像两颗绿宝石。他的耳朵一直翘着，只要你动一下，他的耳朵就会动一下;他的听力十分敏捷，只要有人轻轻走过，它就会“喵喵”的叫;它的牙齿很坚硬，又尖又长，吃起东西来十分轻松，我很喜欢它。

记着有一次，我的哥哥到我家来玩，小猫无比热情，一直冲哥哥“微笑”。哥哥见他这么可爱，便拿出一根很粗的毛线，要知道猫最喜欢玩毛线了，哥哥提着毛线，小猫也跟着走，毛线从拐弯处过去，猫一下冲过去，没有抓到，自己倒扑了个空，我和妈妈哈哈大笑，猫有点生气，哥哥换了一块布，过了拐弯处，小猫冲去，又扑了空，这下哥哥成了“斗猫士”了。哥哥又把五个凳子摆成一排，把毛线放在凳子口，小猫一下冲过去，奋力咬住了毛线，我为它欢呼，为它高兴。

冬天来了，我给小猫盖了一个温暖的窝，它非常高兴。每当我放学回家走在楼梯上时，小猫就卧在沙发上等我，我一进门，它脸上笑成了一朵花。见我买了吃的给它，高兴得舔着我的手，无比热情!

有天，爸爸给我说：“你看哪，狗可是忠臣，猫可是奸臣。”我着急了，忙说：“猫是我最喜欢的动物，它才不是奸臣呢!”妈妈跑过来当裁判，规定每人写出喜欢猫或狗的理由5个，然后评高低。我的笔刷刷写着，1、我喜欢猫;2、小猫的毛很光滑;3、猫对我很真诚;4、猫非常可爱;5、猫非常机灵。刚写完，我抬头看看爸爸，哈，他才写了两个，我们都交了卷后，裁判以爸爸写的字多为由，宣布爸爸胜利。我很不服气，我相信，我会将小猫的可爱永远扞卫下去!

小猫，淘气、可爱，他给我的生活带来了快乐，无论怎样，我最喜欢的动物就是小猫!

There are all kinds of animals in the world . My favorite animal is rabbits. It has two long ears, a pair of red eyes, and a short tail. It likes jumping. It likes eating carrots and cabbages. It is one of the worlds most lovely animals.

唐晨洛

我的小狗叫皮皮，它是一只小泰迪犬，有着一身棕色的卷毛，还有一对黑葡萄似的大眼睛，里面闪烁着好奇。

每当我给它好吃的时候，它的尾巴就开始慢慢地摇，然后越摇越快，最后腾空一跳，把好吃的叼下来。

当它身上有新衣服时，它开始会不适应，就不知道怎么走路了。它伸直着一条后退再往上抬抬抬，放也放不下去，有时甚至会失去平衡，自己翻到在地，看得我哈哈大笑。

有太阳的中午，它会躺在阳光下，阳光照着它蓬松的毛格外好看，我便会抚摸着它的头，给它挠痒痒，陪它一起玩耍。

当我要出去时，它就蹲在门口“唔、唔”地急叫，我知道，它是舍不得我走呢！

我的皮皮——一只可爱、忠诚、贪玩、漂亮的小狗；一只可爱、忠诚、贪玩、漂亮的小泰迪，它带给我许多欢乐，我越来越喜欢它了。

说起小动物，我可最喜欢小猫了，因为他机灵、活泼、可爱。

爷爷家就有一只小猫。它的外形和老虎十分相似，很威武，但比老虎小很多。小猫身上是黑白相间的，还有一条条小斑纹呢！两只蓝宝石般的眼睛嵌在脸上，煞是好看。白天，它的眼睛眯成一条线，到了晚上，它的眼睛里发出一道道亮闪闪的光。

小猫第四支撑着肥胖的身子，走起路来一摇一摇的，小尾巴竖起来，远看好像一根小棍。

小猫捉老鼠时，把背高高耸起，摆出一副攻击猎物的姿势，猛扑过去老鼠想跑也跑不了。

我喜欢爷爷家那只可爱的小猫。

Few Americans study stay put for a lifetime. They move from town to city or to suburb, from high school to college in a different state, from a job in one region to a better job elsewhere, from the home where they raise their children to the home where they plan to live after retirement. With each move they are forever making new friends, who become part of their new life at that time.

很少有美国人学习留一辈子。他们从城市搬到城市或郊区，从高中到大学在不同的国家，从一个地区到一个更好的工作在其他地方，从他们的家中，他们的孩子在家里，他们计划在退休后生活。随着每一个移动，他们永远在新的朋友，谁成为他们的新生活的一部分，在那个时候。

在美丽的大自然中，生活着各种各样的动物，有高大粗壮的大象，有黑白相间的斑马，有凶狠食肉的老虎，还有温顺可爱的猫，能吃能睡的猪等等……，而我喜欢的动物是——狗。

狗分为很多种类，有适合在雪地中生存和奔跑的阿拉斯加狗，有西班牙特有的斗牛狗，有可以为人们牧羊的牧养犬，有西藏 独特的藏獒，还有专供人们观赏的吉娃娃，不论哪一种狗，都是聪明、忠实，温顺，可爱的。

狗是一种非常聪明的动物，他的嗅觉十分灵敏，因为它有约两亿嗅觉细胞，是我们人类嗅觉的好几十倍，经过训练的警犬，可以帮助警察们搜寻毒 品、抓捕犯人，甚至还可以帮助人们寻找丢失或遗失物品呢。

狗还是人类的好朋友，在乡下，几乎每一户农家都会养一条狗在他们下地干活或外出时帮助他们看门，而狗又因为一点风吹草动就会警觉地抬头再加上对人的认识感觉两重保险，深深地受到了人们的信赖。

狗最大的特点就是忠心耿耿，不像抗战时期的伪军似的贪生怕死，相反，狗会为了主人赴汤蹈火，我曾经看过这样一则报道：有一只狗每天都到车站等候，直到最后一班车过后，他才依依不舍的走开了，后来，记者经过打听才知道，这只狗的主人以前都是在这个车站下车，但几天前因为意外事故离开了人世，但这只狗每天仍然到这个车站等候，就是希望见到它的主人，最后，它趴在了车站上，含着泪死了。这是一条多么有责任心、有忠心的狗啊！为了自己的主人，他可以付出生命！

My Favourite Season

Dear Li Ming,

How is everything? I’m glad to tell you something about my favourite season——spring.

Spring comes to Canada in March. The weather is warm and sunny. People feel comfortable. But sometimes the temperature can be as low as -15℃ and it even snows. We won’t see flowers until May or June! In this season, we can play “snow” soccer. On weekends, we can also have a field trip to the countryside and make syrup. There are plenty of fun activities in spring.

I am looking forward to the coming of spring. It’s a season full of hope.

我喜欢性格古怪的猫，也喜欢漂亮的白鹅，不过我最喜欢的还是忠诚的小狗。

在我过生日时，我要求妈妈给我买了一只小狗，我给它取了一个名字，叫旺财。旺财长得有一点胖，它的毛是黑色的，耳朵尖尖的，牙齿也很尖，很像一只军狗。

旺财特喜欢吃肉骨头和麻辣之类的食物，它的嗅觉也很敏锐。记得有一次，妈妈买了一包麻辣，却不让我吃，我就和旺财说：“旺财，我们是好兄弟，对吧！你能帮我找包麻辣吗？我也会分你一点的！”听到有吃的，它就像打了鸡血一样，开始了寻找。果然，狗的鼻子就是厉害，一下子就被它找到了。我高兴的给它分了两片，它一下子就全吃完了。为了感谢它，我又奖励了它一片。

旺财还喜欢踢足球，经常让我带它一起去后院踢足球。如果它接到了足球，就会得意洋洋的站在球上，看着我。如果它没接到，就会冲着我大叫两声“汪汪”。我们玩得可开心了！

人生是有聚终有别的！有一次，奶奶来我家的时候，把旺财看成了野狗。结果奶奶一不小心用扫把打死了旺财，因此我还大闹了一场，妈妈说会给我再买一只更好的小狗。可是，别的什么都不能和它比呀！在我心里，有一种强烈的悲伤感。

现在看到街上的流浪狗，我都会想起旺财。如果能看着它成长，我会很开心的！

旺财在我的记忆中留下了一段开心，也留下了一片思念。

Advice on Protecting Wild Animal

Many animals are in danger of dying out。 As is shown in the chart， we can see the number of animal species decreases faster and faster and this trend will continue。 From 1980 to 2010， at least 1 million animal species have disappeared。 Worse still， more and more wild animals are in great danger。 It is not a piece of sensational news; it is a fact， a harsh reality。 Unfortunately， we may not see these animals in the near future。

很多动物频临灭绝的危险。图表显示，我们能够看到动物物种数量下降的速度越来越快，而且这种趋势将会持续下去。从1980年到2010年，至少有100万动物物种已经消失。更糟糕的是，越来越多的野生动物处于巨大的危险中。这不是一则耸人听闻的新闻，这是一个事实，一个残酷的事实。不幸的是，将来我们可能看不到这些动物了。

From the second picture， we can find some reasons。 Why is the number of animal species declining year by year? Apparently animals have bee victims of fashion industry。 Animal skin has been used to make fashionable clothes and these clothes sell at a high price。 So some greedy people begin to kill animals in a large quantity。 This irresponsible behavior not only breaks the balance of nature but also endangers the living environment of human beings。

从第二幅图我们能够找到一些原因。为什么动物物种的数量一年年的减少呢?显然，动物成为了时尚工业的受害者。动物的皮被用来做时髦的衣服，而且这些衣服都是高价出售。因此，一些贪婪的人就开始超多屠杀动物。这种不负职责的行为不仅仅打破了自然的平衡，而且使人类居住环境陷入危险。

As far as I am concerned， something must be done to stop this illegal action。 We believe "no buying， no killing"。 First， we must make concerning laws to protect these animals in danger。 Second， we must take some measures to protect animals effectively。 Animals are our friends and part of our environment。 Third， we should raise peoples awareness to protect animals and our environment。 In this way， we can build a harmonious society and ensure a sustainable development。

在我看来，我们务必要做些什么来阻止这种违法行为。我相信“没有买，就没有杀”。首先，我们务必制定有关法律来保护这些处于危险中的动物。其次，我们务必采取一些措施有效的保护动物。动物是人类的朋友，也是我们环境的一部分。再次，我们就应提高人们保护动物和环境的意识。这样一来，我们就能够建立一个和谐的社会，确保其可持续发展。

【导读】：铛铛有一身像白大衣一样皮毛，雪白的小爪儿，像四朵梅花;那条翘着的小尾巴，一刻不停地摇摆着，像钟摆一样;那双黑色宝石似的大眼睛总是充满好奇。

【正文】：

我最喜欢的动物就是我加的小狗铛铛了!

铛铛长得非常漂亮，谁见了都喜欢。铛铛有一身像白大衣一样皮毛，雪白的小爪儿，像四朵梅花;那条翘着的小尾巴，一刻不停地摇摆着，像钟摆一样;那双黑色宝石似的大眼睛总是充满好奇。

铛铛吃东西的时候非常有趣。当我把肉骨头抛起来时，他就像被训练过似的，会跳起来用嘴叼起骨头，把骨头拖进自己的窝，然后啃的精光。

一天早上我带它去跑步，而它总是跑在我的前面，时而回头看看我，又继续向前跑。一只别人家的小狗从他面前走过，他就会顽皮地扑上去和它们打在一起，你咬我一口我踢你一脚，最后干脆滚在一起，保准一身白毛变成一身黑。回到家，我训斥它一顿，它蹲坐在地上，一双可怜的大眼睛一眨一眨地看着我，好像在说：小主人，我错了，请你原谅我。看着它可怜的样子，我摸了摸他的头。他好像懂了我的意思，立马摇摇尾巴围着我的腿转圈。

这就是我最喜欢的动物小狗铛铛!

[我最喜欢的动物五年级作文300字