初中一年级下册英语作文大全热门20篇

（1）以单数名词或代词，动词不定式短语作主语时，谓语动词要用单数;主语为复数时，谓语用复数，例如：

He goes to school early every morning.

The children are playing outside.

To work hard is necessary for a student.

（2）由and或both……and连接的并列成分作主语时，谓语动词用复数。例如：

Both he and I are right.

Mr Black and Mrs Black have a son called Tom.

但并列主语如果指的是同一人，同一事物或同一概念，谓语动词用单数。例如：

His teacher and friend is a beautiful girl.

The poet and writer has come.

（3）由and连接的并列单数主语之前如果分别由each, every修饰时，其谓语动词要用单数形式。例如：

In our country every boy and every girl has the right to receive education.

Each man and each woman is asked to help.

（4）主语是单数时，尽管后面跟有 but ,except, besides, with 等介词短语，谓语动词仍用单数。例如：

The teacher with his students is going to visit the museum.

Nobody but two boys was late for class.

Bread and butter is a daily food in the west.

（5） 一些只有复数形式的名词，如people, police, cattle, clothes等作主语时，谓语动词要用复数。例如：

A lot of people are dancing outside.

The police are looking for lost boy.

（6）由each, some, any, no, every 构成的复合代词作主语时，谓语动词都用单数。例如：

Is everybody ready?

Somebody is using the phone.

（7）有两部分构成的物体的名词，如glasses, shoes, trousers, chopsticks, scissors 等作主语时，谓语动词用复数。例如：

Where are my shoes? I can’t find them.

Your trousers are dirty. You’d better change them.

如果这类名词前用了a pair of等，则往往用作单数，谓语动词的单复数形式往往取决于pair的单复数形式。例如：

Here are some new pairs of shoes.

My new pair of socks is on the bed.

近来听说这汉景帝的儿子刘彻就快要成婚了，作为他的宫女之一我由衷的替他高兴。

京城内外自是一片繁华，赤砂朱瓦都愈发的变耀眼起来，正值阳春三月万物复苏之时，却偏偏有一片沾不上一点灵气之处，就无论何时，这冷宫里都是一如既往的寂寥空旷——

破败的庭院中杂草丛生，蛛网几乎占据了每个角落，四处阴暗潮湿，从瓦罐里传来的阵阵气味令人作呕，耳畔不住的响起惨绝人寰或有低沉的抽泣声，这就是冷宫生活的全部写照了。

奉主人的命令给娘娘来送饭，娘娘一向狡黠，我想着可能是走错了哪步棋才会陨落至此，心里暗暗可惜，一朵花就这么白白的凋谢了，果真是薄情总在帝王家。

我提着竹篮小心翼翼的走近一间清净的小殿，看到娘娘门上的木牌，心想就是这儿了。

我刚想推开门，那门便自己倒了，零落的木杮一股脑儿全碎在地上，我吓了一跳，内屋的娘娘猛的被惊醒，原本美丽的长发如今毫无美感垂在地上。

她之前也是救过我的，这样算去我还欠她一条命，她也算是我半个恩人了，再说我之前也是当过养心殿的宫女。不过我估摸着她可能看在主人或皇上的面上会饶我一命。

“奴婢该死，奴婢该死。”

我没有多想什么，跪下头低垂着，过了一会，我见没有什么动静便颤抖着慢慢抬起头。

娘娘在冷宫里还是有着那么一点点权利的。现在我的身份是个小宫女，万一她把我逐出宫了怎么办，不行，师尊告诉我我来这儿是为了找玄鸟之心的，我可不想出什么岔子，我偷偷使了点法术，毕竟我这三脚猫功夫，虽然不能上天入地飞檐走壁，还是足够对付一个凡人的。

[初中一年级关于玄鸟作文

让我们在成长的过程感中，把脚步放慢一些，再放慢一些，不要在东奔西跑中迷失自己。

把脚步放慢，心灵才能更好地成长。

——题记

初读这本由实力派作家章红精心撰写的原创精品小说，我便被它深深打动了，似乎与读《窗边的小豆豆》后同感：父母对孩子的爱永远是最伟大、最无私的，而这俩位母亲对孩子的爱似乎更智慧、更包容……

这是一本适合儿童和大人共读的长篇小说。基本上，小说中的主人公杨等等就是作者女儿的真实写照，杨等等的妈妈唐妮就是作者本人。小说生动、精炼地描写了杨等等的小学生活，主要围绕杨等等自己的故事，杨等等和妈妈唐妮的故事，杨等等和捣蛋同桌“原子弹”、老师以及别的同学之间的故事。这些故事都来源于他们真实的生活，所以读起来亲切、很有同感。

杨等等，一个天真透明、乐观无邪的小女生，正因为有了爸爸、妈妈宽容的爱，让她在一个温馨的家庭中，以自然的方式无拘无束地成长。她不需要压抑自己的天性去接受各种强化训练，不用面对“与同伴竞争后失败、或挨老师批评后”而有可能回家遭到爸爸妈妈的吆喝斥骂。这些竟源于杨等等与生俱来的幽默感，源于她感受快乐的能力，源于她随时随地迸发出的、漫无边际的创造力与想象力……所有这些都使妈妈惊叹不已、感动不已！妈妈那已被遗忘的童年世界重新被唤醒，想与女儿一起重温那流失的童年。所以，她的女儿享受到了纯真、快乐、无忧无虑的童年时光！

这一切，无一不令我羡慕，使我感动。羡慕杨等等“浑然天成”的幸福童年，感动唐妮妈妈宽容而智慧的爱。

我们一天天地在成长，童年时光美好而短暂，且一去不返，所以我们更应该好好珍惜，珍惜与家人、与老师、与同伴在一起的宝贵时光，用心共度、享受这个时光。让成长的脚步放慢些，再慢一些，不要在东奔西跑中迷失自己。把脚步放慢，心灵才能更好地成长。

这些，或许正是作者所要告诉我们的：童年最宝贵的是什么，童年最需要的是什么。愿天下所有的父母和孩子都能读懂它！

[放慢脚步去长大初中一年级作文

I like playing basketball .It’s very interesting . I often play it with my friends. It’s a team work.. Everyone needs to work together with others. (每个人都需要和别人合作). I can also make many new friends in the game. My favorite basketball player is Yao Ming. He is very tall and plays basketball very well. I want to play in NBA one day like him.

我喜欢打篮球。它非常有趣。我经常玩它与我的朋友们。这是一个团队的工作..每个人都需要与其他人一起工作。 （每个人都需要和别人合作）。我还可以在游戏中交到很多新朋友。我最喜欢的篮球运动员是姚明。他非常高，篮球打得非常好。我想在NBA玩上一天像他一样。

[关于我的爱好初中英语作文

"As" this sentence is confirmed by the wonderful nature, yesterday the

wisper under light rain, my heart is heavy like a rock, because want to master

and old milk grave, before, I dont understand the real meaning of the qing Ming

day, until today after sweeping the tomb, I understand the true meaning of

tomb-sweeping day!

At seven o clock in the morning, we prepare to master and old milk grave,

grave is a fresh thing for me, we take tools and set off.

Walking the winding mountain road, I cant wait, after about an hour, we

came to the master and old grandmas grave, a year didnt come, graves are

covered with wild grass, you well after the division of labor, began to busy,

everything is in place, we started to burn money, along with the smoke, I seem

to see their shadow, they told me: study hard and cherish life.

Yes, life is short, happy every day to live, to continuously surpass

ourselves, surpass ourselves, dream will come true; The superego, the dream into

power; Beyond the self, to create beautiful life! I think life is constantly

transcend self, beyond the dream!!!!! Panoramic view of the city house on the

mountain, the mountain was full of golden golden in the rape, deep breath, deep

and remote light fragrance, fresh air, the flowers with irresistible power

explanation of the meaning of life!

描写家乡的变化初中英语范文篇一

Changes in My Hometown

My hometown used to be a backward place, because it was deep in the mountains, where there were no nice buildings and the roads were so narrow and dirty. People lived a poor life.

我的家乡过去是一个落后的地方，因为它在深山里面，那里没有漂亮的建筑物，公路也是又小又脏的。人们的生活都很贫苦。

While in recent years, with the development of society, my hometown has been greatly changed. Now the roads are getting much wider. There are many different cars and buses running on the roads. Trees and flowers are planted on the two sides of the roads. They can provide us with oxygen and fight against the pollutants. So the sky becomes cleaner and brighter. Whats more, you can see many modern and beautiful buildings everywhere, and the living conditions are improving. People are enjoying a comfortable life now.

近年来，随着社会的发展，我的家乡发生了很大的变化。现在的路是越来越大了。有许多不同的汽车和公交车在道路上运行。道路两边种满了树木和鲜花。他们可以为我们提供氧气，与污染物抗争。现在天空变得更清洁、更明亮。更重要的是，你随处可见到许多现代和美丽的建筑，人们的生活条件也得到了改善。现在人们在享受舒适的生活。

描写家乡的变化初中英语范文篇二

Great changes have taken place in my hometown for recent years.big department stores and factories are everywhere. Different kinds of cars and buses are running in the big streets.with the development of the society，The life of the us is greatly improved.

I used to live in a small house and small houese surround the whole city. the qaulity of our life is very low,people were always worried that they would have no money for using or they can not get what they like. we could seldom see any foreign tourists.

But now, with the support of the government . My hometown has developed quickly and has changed a lot.people are living in a rich and high quality society,almost each person has a car,the transportation is convinient,meanwhile. more and more high buildings are being built which brings our hometown a new look. many wonderful places have been opened up that attracts many tourists.

Also,the people in my hometown are getting busier, everywhere you can see peoples footprints.

描写家乡的变化初中英语范文篇三

In recent years, my hometown has changed greatly, because of new road and railway has been built. Previously, my hometown was closed to the outside world. Several years ago, the government paid much money on changing the basic equipment of my hometown. Building new roads is the biggest project. It took about half a year to build the new road. After finish, people have more methods to make money. And we have more communication with other places, which is a good way to develop ourselves. About two years latter, the railway was built. After that, there have been more and more changes happened in my hometown. Now, my hometown has developed into a big and rich town. People live a happy life.

最近几年，由于建成新的公路和铁路，我的家乡发生了很大的变化。以前，我的家乡与外界隔绝。几年前，政府花了大量资金改变家乡的基本设备。新建公路是最大的工程。新建公路大约花了半年时间。公路建成后，人们找到了更多赚钱的方法。而且，我们可以与其他地方互通，这是我们发展自己的好方法。大约两年后，铁路修好了。从那以后，我的家乡发生了越来越多的变化。现在，我的家乡已经变成一个富裕的大城镇。人民过着幸福的生活。

This week I didnt do many wonderful things．

I went to learn developing film with my classmates on July 1st． It was easy and we all got good marks．

On July 4th， I went to school to learn， because I will be a junior three student soon． We would have to learn some lessons in advance． The weather was very hot． But I didnt feel that learning lessons was boring． Some teachers are new． They are good I think， although they are all looked strict． And the lessons were not too bad．

This week was the beginning of this summer holiday， but it was really typical ．

My school is very beautiful. It is Nanhai Experimental School. There are

three tall buildings in our school. They all have five floors. In the teaching

building， the P.E.room is on the first floor. The library is on the second

floor. The science rooms are on the third floor. The computer rooms are on the

third floor and the fourth floor. The music rooms are on the third floor and the

fourth floor. My class room is on the fifth floor. I am in Class9， Grade 6.

There are five gardens in our school. In the gardens there are many beautiful

flowers， grass and trees. There is a big playground in my school.

I like my school， because my school is very beautiful.

人生当中每个人心目当中，可能都有一个自己崇拜的人，可能是自己的父母、老师、演员、作家、名人……但是他们的传奇你们了解吗，可能会了解，可能连知道都不知道，而我的偶像还是从别人那知道的。

他叫刘伟，他从10岁的时候，失去了双臂，但他并未就此而悲观消沉，而是乐观向上地、勇敢地去面对。所以他说过了这么一句话“我的人生只有两条路，要么赶紧死，要么精彩地活着！”

说真的，刚开始我还不知道他是谁，在音乐课我才知晓他是谁，刚开始他十分阳光，深黑的短发，漆黑亮丽的黑色眼镜和他那深邃的眼镜，简直是绝配，再加上他那乌黑油亮的黑色礼服，乍然一看是一个帅气的小伙子。

在他弹钢琴的时候，我听到他那全心全意的弹奏，顿时，就感觉的十分感动，然而，从他说的那些事迹，我才正确的认识他，刚开始他去学习钢琴的时候，别人都歧视他，可是呢，他却不丝毫放弃，终于他达到了七级弹奏钢琴的水平。

然而，再次听到他的歌声时，我却认识到我开始崇拜他了，可能是他那婉转的曲子的打动了我，也有可能是他那坚持不懈的精神打动了我，不管怎么样，他弹奏的钢琴让人回忆起了小时候的事情，回想起来是多么的美好。

但是，他那钢琴的歌声更是让我明白了他一路上的坎坷，和艰辛，所以我崇拜他那对音乐的认真，和他那不屈的精神，让我明白了，只要人坚持不懈的做一件事就一定会成功，希望大家也可以多去关注他，寻找自己心中的偶像！

Hi, everybody! Today, I would like to introduce myself!

My name is ChengZiYing, 9 years old this year, I am a lovely little girl. I have a pair of watery eyes, a pair of big ears, a straight nose, a plausible mouth, a tender little face, have a black long hair on his head. Oh, regardless of appearance! Tell me about my hobby, advantage!

I often help my mother do housework at home, I also can play the piano! Ill play the song: "Mr. Red rope", "river bank Mongolia folk song", "dream wedding", "the moon represents my heart". Sometimes, when I was at home all right, will create their songs to play, and the lyrics!

I am very obedient at home, this is me, do you understand me? If you still dont understand, that is quick to make friends with me!

[初中英语作文：自我介绍

Sports do us good in many respects.It goes without saying that taking

exercises can build up our physical strength. In collective sports like

basketball, volleyball, or football, we will learn the importance of

cooperation. While taking part in sports game, we will try our best to win and

arouse ourselves the competitive spirit. Sports can also help us relax after a

period of exhausting work. However, as the saying goes, "there are two sides to

everything", and sports is without exception. We may hurt other players or

ourselves if we are not careful enough when participating in sports activities.

Whats more, excessive or severe training can do harm to our health.

My participation in sports tells me that sports can make us healthy both

physically and psychologically. It is also a good way for people to know each

other and can promote friendship between people. So long as we are carefully

enough, sports can do us nothing but good.

Once a child asked such a question: What can I benefit from being "a good

child"? Among the many answers he received one ran like this: "A good child" is

the most precious gift God gives to you. And the same can be said for being

honest. It pays to be honest.

Yes, its true that dishonesty exists almost everywhere in the society.

Consumers often found themselves being blackmailed by those merchants selling

shoddy products; and there are students

Cheating in order to pass the exams or get high marks; moreover, we are not

short of examples that many rich professionals evade the taxes by sacrificing

the interests of government.

But havent we seen their results? "A fall into the pit, a gain in

customers wit", which would surely drive those dishonest merchants out of

business. Regret of wasting time yet being

Empty-handed would accompany those dishonest students all their life. On

the contrary, we could have all they lost, especially a good reputation and a

clear conscience, which are the best qualities of human beings. Thats why we

say "It Pays to Be Honest".

请以 My Best Friend 为题，写一篇不少于60个单词的作文。 My Best Friend 我最好的朋友My best friend is one of my classmates. Her name is Mary. Every day, we go to school together and go back home toget

请以“My Best Friend为题，写一篇不少于60个单词的作文。

My Best Friend

我最好的朋友

My best friend is one of my classmates. Her name is Mary. Every day, we go to school together and go back home together. We often help each other and learn from each other in study.

我最好的朋友是我的一个同班同学，她的名字叫玛丽。我们每天一起上学，一起回家。我们经常互相帮助，并向对方学习。

We have the same hobby-collecting stamps. She has many nice stamps. She is very proud of them. Sometimes she gives some of them to me. I think she is a very good girl. We will be good friends forever.

我们有着相同的爱好——集邮。她有很多漂亮的邮票，并为此十分自豪。有时，她会把其中的一些邮票给我。我认为她是个非常好的女孩。我们会成为永远的朋友。

点评：这是一篇记人的叙述文。先交代了My Best Friend是谁，接着通过事例交代了为什么“我们是最好的朋友”。最后阐述了主题。

Today, I saw a very delIcIous strawberry In Taobao network. My fIrst tIme wIth my own favourIte people to share. He lIkes It very much, but he has not eaten thIs kInd of strawberry. The flavor of the strawberry Is mIlk. He felt very strange. So he wanted to try the strawberry. And the prIce Is not expensIve, there are 5 yuan of red packet. I thInk It Is worth It. So , I am goIng to buy hIm a box of strawberrIes . A total of 5 pounds of strawberrIes . I thInk he must be very happy when he receIved It ! WIll feel very happy , very pleasant surprIse ! I thInk , to spend a lIttle money to gIve theIr favorIte people a surprIse, thIs Is a very good thIng. However, strawberrIes must be fInIshed as soon as possIble. 5 pounds of strawberrIes a total of about 100 , to see the sIze of strawberry and Its weIght. Strawberry Is a perIshable food, so It must be put In the refrIgerator. But In the refrIgerator can not be stored for a long tIme.

译文：今天，我在淘宝网看到很美味的草莓。我第一时间跟我自己最爱的人分享了。他很喜欢。可是他没有吃过这种草莓。这种草莓的味道是牛奶味的。他觉得这很奇怪。所以他想尝尝这种草莓。而且价格也不昂贵，还有5元的红包。我觉得很值得。所以，我打算给他买一箱的草莓。一共是5斤的草莓。我想他收到的时候一定会很开心吧。一定会感觉到很幸福，很惊喜吧！我觉得，花费一点点的钱就可以给自己最爱的人一个惊喜，这是很美好的事情。不过，草莓一定要尽快的吃完。5斤的草莓一共是100个左右，要看草莓的大小和它的重量。草莓是易腐蚀的食品，所以要放进冰箱里。但是在冰箱里的草莓也不能保存很长一段时间。

[初中英语作文之草莓

车水马龙，霓虹灯还在闪着，给街道增添了一份繁华。远方的天空还充斥着残留的光辉，交通标志牌井然有序地立在各个角落。“丁零零……”一阵阵清脆的自行车铃声时不时地响着，夹杂在其中的是那悠长的汽车鸣笛声。旁边，是一家家时尚的商店，里面温暖的灯光引起了人们回家的欲望，动听的流行音乐为整条街道增添了一份别类的风格。闭上眼，细细聆听，老街，这不是应有的旋律。轻轻呼吸空气，也早已失去了应有的纯净。窗外，那棵老树还在生长，只不过上面蒙了层薄薄的灰尘，掩盖了它昔日的风采。老街，你去哪里了？我往日的那个伙伴纯朴而又洁净的你，去哪儿了？

走出家门，悠闲地散步，不经意间，便拾起了一片废纸，不由的深深叹了口气。心，也早已随废纸回到了五年前……

依然是无垠的天，依然是傍晚的余晖。但那时的你，是我的挚友。晚饭过后，我时常会出门散步，脚下，便是默默注视我的你，我最爱在你身上玩了，时而与老树倾谈，时而又在那里呆呆的看着各型各态过往的行人。不过，只要和你在一起，我的心情便会异常的愉悦。

当时的你，就像一个花枝招展的姑娘。虽然商店没有现在繁华，也没有现在的车水马龙。但你，但你是最真实的。天空就像无瑕的蓝宝石，让人沉醉！两旁的建筑物显示出的，是历史的沧桑与成就之美，那棵老树，也正在蓬博生长，绿叶如翡翠般苍绿，显示出生机勃勃的活力。你也洁净如新，我看痴了，似乎幻化成了笑眯眯的你。欣喜之余，深呼吸口气，那般洁净，让我久久不能忘怀。

“嘀嘀……”汽车的鸣笛声把我从回忆中惊醒，我回过神来，今日的老街，早已没有当年的自然。再次环视它，我才恍然大悟，改变了街道的元凶，竟是我们一直挂在嘴上的“环保”！是呀，时代在进步，但人们的环保意识也在进步吗？不，相反的是严重的退步。是，我们追求时尚，但，我们赖以生存的大自然也要因此而被垃圾堆满吗？我想不是的。每个人的心中，都有着那么一片绿。那么，就行动起来吧！捡起你扔的垃圾，让那里变成绿地，收起呛人的尾气，还天地一片鸟语花香。也请还我心中一个真实的老街吧！还我一个从小时候最亲切的朋友吧！让老街继续写下它的故事！

[初中一年级作文：这就是它的故事

Hello！ My name is Weiwei. My father is very handsome.My mother is very beautiful. So I’m very lovely. Look！ My coat is red. My eyes are blue. I have a long tail. Fish is my favorite food. I like mice too. Guess！ Who am I？

在国庆假期里，最快乐的事就是妈妈带我去动物园游玩。

动物园里的动物可多了，有会喷水的大象，有活泼调皮的猴子，有高贵漂亮的长颈鹿……最凶猛的狮子、老虎和大狗熊是圈养在虎山的，我和妈妈是坐着缆车观看的，坐在缆车里往下看，我刚好看到有一头黄色的大狮子正在张着那血盆大口吼叫，声音大得像打雷，我的心紧张极了，不由得握紧妈妈的手。

在百鸟园里，我见到了好多鸟，不过大部分我都不认识。我们看了鸟艺表演，观看了鹦鹉说话、鸽子识字等节目。最有趣的要数乌鸦拉车子了。一只黑黑的乌鸦拉了一只雪白雪白的鸽子，到了目的地，鸽子却不付钱，乌鸦气呼呼地把车子推翻在地，逗得观众哈哈大笑。

这里好看好玩的可多啦，说也说不完，真让人流连忘返!

In the National Day holiday, the happiest thing is that my mother took me to the zoo to play.

Zoo animals can be more, there will be sprayed elephants, lively naughty monkeys, there are noble and beautiful giraffe ... ... the most ferocious lions, tigers and big bears are captive in the hills, and my mother is sitting Watching the cable car, sitting in the cable car down to see, I just saw a big yellow lion is hanging that blood pool big mouth roar, the sound is like a thunder, my heart is very nervous, could not help but clenched my mothers hand.

In the bird park, I saw a lot of birds, but most of the I do not know. We watched the bird show, watched the parrot to speak, pigeon literacy and other programs. The most interesting to the number of crow pull the car. A black crow pulled a snowy white pigeon, to the destination, the pigeons did not pay, the crows to the car overturned to the ground, amused the audience laughed.

There are so nice to play more friends, that can not finish, really let people forget!

It is 4,000 years since the Chinese began to grow and drink tea.

There’re many kinds of tea in China, of which Longjing Tea is famous all

over the world.

Tea is usually drunk in tea sets. A tea set is made up of a tea pot and

some teacups, which are both made of china.

Most Chinese are fond of drinking tea. Tea is served not only at tea house

and restaurants but also at home. People also drink tea during breaks at offices

or factories.

Im a Middle Schools student.I am busy.Next summer, I have a long vacation

and I have a very good plan for this vacation.

I think about going to the Beijing. I heard Beijing is beautiful and there

are many peopie there who are friendly.

I am going to the Tianan Men Square, going to the Palace Museum ,going to

the Great Wall and going to the Beijing Hutong.These famous places can make me

to have fun.For something else , I can go shopping, go sightseeing, go having a

lot foods. At night, maybe renting videos and sleeping a lot……

A great vacation! I cant wait!

Spring Festival ,known as the Chinese New Year,is the most important

holiday in China.From late January to early February,Chinese people are busy

preparing for the New Year.They clean their houses ,have their hair cut,and buy

new clothes .Jiaozi or dumpling is most popular.To those who live far away from

their home,this festival is also a framily reunion occasion.

And they often go back home to celebrate the festival with their family.The

first day of the new year is the time when people visit their friends adn wish

each other good luck in the new year.

Today, our class held the monitor election. `And I became the new monitor in my class. I was very happy, but I was still very nervous now. When the election began, I was so nervous that I can hear my heart beating heavily.

I tried my best to calm down for a long time. Then I went to the platform to begin my prepared speech.

I felt my brain was blank when I was having my speech.

Before the election, I was confident for this position, but I still so nervous when I was in the platform. Thanks for preparing in advance; otherwise, I must be embarrassed. But the result was what I want. It’s a happy thing.

今天，我们班竞选班长了。`我成为了新的班长。我很高兴，不过我现在仍然很紧张。竞选开始的时候，我好紧张，我都可以听到我的心怦怦跳了。我努力了很长一段时间才平静下来。然后我才走向讲台开始我已经准备好的演讲。在演讲的时候，我觉得我的大脑一片空白。在竞选之前，我对这一职位是很有信心，但当我站在讲台上时还是很紧张。幸好提前准备了；否则，我肯定很难堪。不过结果却是我想要的。这是一件值得开心的事

[初中英语作文：竞选班长