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高中开学第一天作文英语作文【优秀20篇】

我们在享受美好校园时光的同时,也应该对创建绿色校园富有责任。下面是小编为大家收集整理的是校园环境英语作文,欢迎阅读。

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元宵节高中英语作文

全文共 1706 字

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The 15-Day Celebration of Chinese New Year.

The first day of the Lunar New Year is "the welcoming of the gods of the heavens and earth."Many people abstain from meat on the first day of the new year because it is believed that this will ensure long and happy lives for them.

On the second day, the Chinese pray to their ancestors as well as to all the gods. They are extra kind to dogs and feed them well as it is believed that the second day is the birthday of all dogs.

The third and fourth days are for the sons-in-laws to pay respect to their parents-in-law.

The fifth day is called Po Woo. On that day people stay home to welcome the God of Wealth. No one visits families and friends on the fifth day because it will bring both parties bad luck.

On the sixth to the 10th day, the Chinese visit their relatives and friends freely. They also visit the temples to pray for good fortune and health.

The seventh day of the New Year is the day for farmers to display their produce. These farmers make a drink from seven types of vegetables to celebrate the occasion. The seventh day is also considered the birthday of human beings. Noodles are eaten to promote longevity and raw fish for success.

On the eighth day the Fujian people have another family reunion dinner, and at midnight they pray to Tian Gong, the God of Heaven.

The ninth day is to make offerings to the Jade Emperor.

The 10th through the 12th are days that friends and relatives should be invited for dinner. After so much rich food, on the 13th day you should have simple rice congee and mustard greens (choi sum) to cleanse the system.

The 14th day should be for preparations to celebrate the Lantern Festival which is to be held on the 15th night.

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篇1:高中英语作文:不要和陌生人说话

全文共 971 字

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Before we go to school, we get our parents to supervise us all the time, so we live in a very safe environment.

While when we go to school, parents can’t keep their eyes on us all the time, they are so worried about us, so they begin to tell us how to keep ourselves safe.

The most important thing is that don’t talk to strangers, as a teenager, we haven’t had the ability to judge who is the good guy and who is the bad guy, so it is better not to talk to the strangers.

The bad guys will like to talk to the teenagers, they want to do something to pay the teenagers’ attention, thus they can induce the children to go with them and do the bad thing.

In order to protect teenagers’ security, teenagers are taught to keep distant from the stranger.

在我们上学前,我们一直有父母的照看,所以我们生长在一个很安全的环境。然而当我们上学以后,父母不能一直监视着我们,他们很担心我们,因此他们开始教导我们如何保持自身的安全。

最重要的事情就是不要和陌生人说话,作为一名青少年,我们还没有能力去判断好人和坏人,所以最好不要和陌生人讲话。

坏人会喜欢和青少年聊天,他们想要做一些事情来吸引青少年的注意,以此来引诱青少年跟他们走,做坏事。

为了保护青少年的安全,青少年应该和陌生人保持距离。

[高中英语作文:不要和陌生人说话

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篇2:高中励志英语作文

全文共 1917 字

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Life is a long process, we have too many expectations, will inevitably encounter disappointments and frustrations. The ideal on the shelf, come back to find that we like a fish, always thought that I had wings are birds, but finally I know that I cant fly. Life like water, and sometimes cloudy, sometimes clear, we struggle against social this big VAT - "I often feel life owed me, why do people always happiness and joy than yourself?" In the face of setbacks, we complain about life deceives us, we thought there was no hope of their life. We often compared himself to lost the swan, but forget oneself want how to fly.

As a child, then established the goofys desire. So many years, has been trying to, in insist, waiting for, has vowed to make yourself proud fly. But the difficulty and the setback already ambush all around, lets get stuck here. We have very strong telling myself, dont because at present small setbacks, but let themselves to give up the dream life? Even if life has deceived me, but this is not fearful; The enemy attack me, also is not terrible, terrible is betrayed our dream and gave up. Even live tired, live hard, also want to insist on your dream, give their best confidence and courage, toward a glorious and brilliant tomorrow. But few people do it?

But grew up, social this big cylinder multifarious colors, we see more dazzling. But we think the bottom of my heart has its own principle, can easily be tempted by the outside world? When looking back to the historys dust, always feel oneself still maintain magnanimous feelings from the past, still with his own emotion, but always failed for himself and guilty about ideal life. We should think like this: one failure is nothing, still remains the most quality of the things we do, we insist the dream is still the most valuable. With the accumulation of time, looking at others get summer fruit, they themselves are empty。

[高中励志英语作文3篇

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篇3:英语新学期开学寄语

全文共 3061 字

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Today is the first day of the New Year. At this moment, the teacher is very emotional. I am very happy to see all the students who are full of spirit! To borrow this precious opportunity, I would like to say a few words of encouragement to my classmates:

First, we should have the confidence and determination to make progress. At the start of the New Year, when you seriously sum up the past, in the first semester, if you feel you in all aspects of performance is pretty good, please dont be proud, you should make persistent efforts in the new semester, strive to achieve better results and make greater progress. If you find yourself having a lot of problems or problems, dont be too upset or discouraged. You should be uplifting and try to catch up. In any case, the teacher hopes that every student will have the confidence and determination that "I will be better than yesterday".

Second, have clear goals and a scientific plan. (the teacher in charge work) have improved confidence and determination to have the motivation, but it is not enough, each student should also with the help of the teachers and parents, analysis, know himself, in thinking, learning, discipline, health and other aspects to make a through their efforts can achieve its goals, and then set out a feasible plan, in order to have a direction in the future study life middle school, learn to have a goal.

Third, pay special attention to the cultivation of good learning and living habits. Teachers and parents are very concerned about their students academic performance, but they are more concerned about whether students can form a good habit of life and study from a young age. Although many students study result is very good, but in the discipline, health, honest and trustworthy, be polite done unsatisfactory, brought a lot of trouble to teachers, parents and students, take their toll. So I hope the students in the process of study hard, must from cultivate good habits of life and study, carefully for each lesson, make each work, specifications complete every time practice, two fuck well done, it will make your learning benefit!

Fourth, through "diligence and earnest" to complete the tasks of this semester. In the new semester, I hope that every student can be diligent in thinking, working hard, making progress and innovation. In addition, the most difficult thing in the world is also afraid of "serious" two words, to learn to be serious, to be more serious. If every student can be diligent and earnest, then every student can be a good student this semester.

Students, "spring", the spring is the season of ploughing and sowing, everything in this recovery, the season of vigor and vitality, let us join hands and work together, sow the sweat of hard, and the struggle of flame, harvest success, harvest hope. In the new semester, we will meet new challenges and seek new development with more enthusiasm and practical spirit. We will strive to build our class into a good class in our school.

In the end, I sincerely wish the students a healthy and happy new term.

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篇4:高中生英语日记精选:Ifeelsosad

全文共 644 字

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I went back home this weekend. I have stay at home for almost a month since the summer break began, I never thought stay at home was great when I was at home, but when I came back to home is the best place for me in the world.

The strong wind was gone, I feel so sad. The weather become hotter and hotter. I can’t bear the sun anymore. As far as I know the swimming pool in this university hasn’t done yet, that is so awful.

It is the hottest summer in the history of Hangzhou, the temperature stay above 30 degree centigrade every day. The summer becomes hotter and hotter every year, that would be very bad to the earth.

[高中英语日记精选:I feel so sad

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篇5:高中英语写作提分技巧

全文共 2570 字

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一、遣词方面:用词要贴切而丰富,善用短语 ,词汇是语言的建筑材料,文章的好坏,选词很关键,如果用词精湛,就会使文章“亮”起来。

1、措辞要贴切具体

试比较下面句子:

A man is walking down the street.

A man is strolling down the street.

通过比较可以看出,前一句不如后一句表达得具体、生动。一个词如果内涵越具体,那么在特定的场景中恰当地使用它,就会收到意想不到的效果。很多同学写作时常随便用一个很笼统的词来描述一个具体事物或人,如 a nice man给人感觉很笼统空泛,我们可以用很多有个性的、具体的词描绘一个人,如 generous(大方的,慷慨的),humorous(幽默的),smart(漂亮的,潇洒的),kind-hearted,warm-hearted,hospitable(好客的,招待周到的),gentle(文雅的),optimistic(乐观的),easy-going(随和的),spirited(英勇的),cultivated(有教养的),manly(有男子气概的),knowledgeable(知识渊博的)等等。

2、要善于运用短语

短语用得好,会给评卷员留下深刻印象。如:

When he was a child,he wanted to learn everything.( 普通)

When he was a child,he had a strong appetite(胃口) for knowledge.(高级)

3、要避免汉语思维

用词要符合英语习惯,避免汉语思维的影响,如某些名词和动词搭配已约定俗成,不能随意打乱其搭配习惯,否则会显得生硬和词不达意。如汉语中的“学到知识”,英语中就不能说“learn knowledge”,而要说acquire knowledge (获得知识) 。类似的动宾结构还有achieve success (获得成功),gain reputation (获得声誉),attain ones end (达到目的)等。

二、造句方面:句式要准确而多变,活用复合句

简单句用得太多,会造成文章读起来乏味。在评卷员看来,同样意思的内容,能够运用比较复杂的句式结构来表达,当然会认为其运用语言的能力要比只会用简单句来表达要强,评分自然就高。

1、巧用非谓语动词

运用非谓语动词,可使文句看起来更简洁,使语言更加丰富多彩,重点更加突出,增加文采。如:

I covered my ears,trying to keep the noise out,but failed. (2004广东卷)

2、巧用with复合结构

“with+名词/代词+现在分词/过去分词/形容词/副词/介词”结构,常作伴随状语以增加被描绘内容的生动性和情感性,使文章读起来更简洁明了。试比较:

I couldnt go on studying because there was so much noise troubling me. (普通)

I couldnt go on studying with so much noise troubling me. (高级)

3、巧用复合句

高考评分标准强调使用语法结构的数量和复杂性,鼓励考生尽量使用较复杂的结构,并且对由此产生的错误采取了宽容的态度。如果恰当运用各类从句,就会使文章出彩。

如:(定语从句) Whats more,people have easy access to the Internet,which enables them to send and receive e-mails whenever they like.

4、巧用倒装句、感叹句、强调句、虚拟语气句等

使用这些句式可使文章化平淡为生动,加强语气,使评卷老师感受作者的强烈情感。

(倒装句)Only in this way can Internet Bars be well used by people.

(感叹句)I thought,“How hard mum is working! She must be very tired.”

5、巧用排山倒海句

如能运用一个个排比句、对偶句、不定式或短语,可令文章增色不少,会给评卷员眼前一亮的感觉。如:

The purpose of the program are to make our school more beautiful,to make the air cleaner and fresher,and to turn our school into a better place for us to study and live in.

三、谋篇方面:结构要清晰而流畅,巧用过渡词

众所周知,语言的最高层次不是传统语法所说的句子,而是语篇。语篇指的是一系列连接的语段或句子构成的语言整体。一篇好的文章不但句子正确,要点齐全,更重要的是有效地使用了语句间的连接成分。因此,恰当使用好连接性的词语和句子,是使作文获得高分的一个重要因素。

下列各组表示列举或补充的短语或句式非常实用,对高考写作很有帮助:

(1)Firstly...,secondly...,thirdly...,finally...

(2)In the first place...,in the second place...,in the third place...,lastly...

(3)to begin with...,then...,furthermore...,finally...

(4)to start with...,next...,in addition...,finally...

(5)first and foremost...,besides...,last but not least...

(6)most important of all...,moreover...,finally...

如果只有两层意思,可选用下列两组中的任一组:

(1)On the one hand...,on the other hand...

(2)For one thing..., and for another thing...技巧,希望对大家有帮助

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篇6:开学感受英语作文

全文共 1191 字

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I still remember the day when I first came to the college. Being a boy of 17, I was longing for a new life as a college student; but, at the same time, I had no idea what college life would be like.

That morning when the bus carried me to the gate of the college. I was so excited that my heart was beating very fast as if it would leap out of my mouth. From now on, I would be a student of this college. After registration, we were led by an instructor to the dormitory, where, for the first time, we were going to live without parents but roommates. I was so clumsy that I did not know how to make the bed and fix the mosquito net.

In the afternoon, I took a walk around the campus together with my roommates. To think of studying in such a beautiful place made me feel quite proud of myself. As we were walking along, talking and laughing, a voice came into our ears, "Oh, look at these freshmen!" It was our middle-school-students looking that gave us away. We continued our tour of the college, inspecting every building and every garden until the sun began to set.

In the evening, we sat together, talking about the past and the future. We were so excited that no one wanted to go to bed.

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篇7:高中英语作文:好邻居

全文共 1074 字

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What is the definition of a good neighbor?Well, in my opinion, a good neighbor should have the qualities: to care aboutother’s feeling, and help others unselfishly.

一个好邻居的定义是什么?在我看来,一个好邻居应该有这些品质:关心他人感受,无私的帮助别人。

I feel lucky to have a good neighbor. Sheis about 65 years old. I remember it clearly,one night, I wascaught in a pouring rain, and then I suffered from a high fever. My parentswere on business, so I turned to her for help, I recovered soon. I have anotherneighbor, we’re in the same age, went to the same school. We always playedtogether. I’m not good at Physics at that time. It was hard for me to pass theexam. After school, she always helped me with my Physics. With her help, I madea big process in my final exam.

我感到很幸运自己有位好邻居。她大概65岁。我记得很清楚,一个风雨交加的夜晚,我发烧了。我的父母正好出差,所以我向她求救,很快,我康复了。我还有一邻居,年龄和我一样,在同一学校上学。我们总是一起玩。那段时间,我的物理不是很好,考试很难通过。放学后,她总是帮助我补课。通过她的帮助,我在期末考试中取得了很大的进步。

Good neighbors create a comfortable andsafe living environment. They’re also our good friends. They make a bigdifference in our daily life.

好的邻居提供了舒适和安全的居住环境。他们也是我们的好朋友,让我们的生活变得与众不同。

[高中英语作文:好邻居

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篇8:高中英语日记

全文共 465 字

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Today, when I awaked up, I found the air-conditioner didn’t work. I used the control, but it still didn’t work. I knew the air-conditioner was in trouble. I went downstairs. My father told me two air-conditioner and two netputer had been broken. Because my father used electric making machine to make electric, so the voltage was not stable. It led to the trouble. Oh! Whenever the government will let the factory use electric? If it lasts longer, I will be crazy!!

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篇9:高中英语作文生活需要宽恕

全文共 1196 字

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There was a teenage boy who stole a lot of money from home and left home to live outside. After staying out for half a year, the boy spent all his money. He was so cold and hungry that he really wanted to go home. Hesitate for a long time, he wrote a letter to his family, wrote in the letter: dear mom and dad, I know I was wrong, only go out in the outside, to remember the warmth of home, these days, I miss you all the time. With deep regret, I dare not to see you, and I am going home on a dark night. If you will forgive me, please hang a light for me at the door. After the letter was sent, the boy set out on his journey home. After a long journey, he came to the mountain girder of his hometown, and he ate some dry food and hid there until night when he crept up the hill. He was shocked when he looked at the village crying. There was a lantern hanging in the door of the whole village!

有一个十几岁的男孩,他从家里偷了一大笔钱,然后离开家到外面生活。在外面呆了半年,男孩把钱全部花光了。他又冷又饿,他非常想要回家。犹豫了很久,他给家人写了一封信,信中写道:亲爱的爸爸妈妈,我知道我错了,只有出门在外,才能想起家的温暖,这些日子,我无时无刻不在想念你们。由于怀着深深的愧疚,我不敢见你们,我准备在一个黑暗的夜晚回家。假如你们愿意原谅我,就请在门口为我挂一盏灯吧。信寄出去后,男孩踏上回家的旅程。经过长途跋涉,他来到了家乡农村的山梁后,他吃了一些干粮,躲在那里,直到夜晚降临,他才悄悄爬上山梁。当他哭着看向村子里看时,他惊呆了。整个村庄的人家门前都挂着一个灯笼!

[高中英语作文生活需要宽恕

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篇10:开学第一天英语作文

全文共 818 字

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How quickly time has flown by! My summer holiday is over.

Our school is much more beautiful than before. The grass in front of the office building is so green. The river beside it is so clean and the trees around it are so tall. Our classroom building has changed a lot. It has become higher and more new than last term.

I come into our classroom. The windows are very new and clean. My classmates and I are interested in the new things in the classroom.

We have come into the third year. We are a little nervous. Were very busy today. We have three new teachers. We all like them. Today just as usual, we have been busy doing everything, but I like life like this. Busy days can make me happy and excited.

This is my first day of school. It is busy but interesting. I like my classroom, my school and I like my first day.

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篇11:高中英语作文:时间的价值

全文共 773 字

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The Value Of Time

I always think there is not enough time. For example, I have just taken a three-day holiday. But when I look back, I just feel that it‘s only one day. There goes a proverb, “Time is money”。 Now I want to say, time is more precious than money, because when money is spent, we can earn some more again. However, when time is gone or lost, never will it return.

Time goes without being noticed. The time for our study and work is usually limited. So I think we must make full use of our time. But it‘s a pity that I am always not aware of the importance of time until it’s too late.

So I think, I should get into the good habit of saving time because wasting time is equal to wasting one‘s life. Do not put off what can be done today till tomorrow!

[高中英语作文:时间价值

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篇12:高中英语书信类作文的万能模板道歉信

全文共 217 字

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示例:

Dear ____,

I am truly sorry that_______(道歉的原因).

The reason is that ______(介绍原因) Once again, I am sorry for any inconvenience caused. Hope you can accept my apologies and understand my situation.

Yours sincerely

Li Ming

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篇13:提高网络安全的高中英语作文篇

全文共 769 字

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How to improve network security

As time goes ongoing surfing on the Internet become more and more popular.It is a new phenomenon and sounds an alarm (for online security ).

Network security cover anti- virus network security and hacker protection . Together with the technology of Access Control redundant backup recovery and network security it makes an allround security system . Many companies devote to the information security technology and product research and development production and sales providing advanced network security solutions . Firewall just is an effective measure of network security .如何提高网络安全

随着时间的推移,上网冲浪变得越来越流行,这是一个新的现象,听起来是一个警钟(在线安全)。

网络安全覆盖防病毒、网络安全和黑客保护。结合访问控制技术、冗余备份恢复、网络安全,它使一个全面的安全系统。许多公司致力于信息安全技术和产品的研发、生产和销售,提供先进的网络安全解决方案。防火墙只是是网络安全的一种有效措施。

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篇14:高中高一开学

全文共 496 字

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一个人的生命记录是不断更新的。每年,每天,每分,每秒都是一个新的开始。面对瞬息万变的世界,我们注定要用新的面貌来适应它。作文大全

开学后就是六年级,这几天我一直辗转难眠,一想到以后就很难见到小学同学和老师了,我就很是伤感,心里酸酸的。

今天是开学的第一天,我和妈妈找到我的所在班级后,妈妈就匆匆的上班去了。我自己一人坐在新的教室里,很是无助。面对那一张张陌生的面孔,我很难过。再见了,小学同学们。当然变化还不止这些,三门主科变成了七门学科,老师也从们见过,这就意味着我们将要重新接受新老师的教学方法,原来所有的习惯都会改变。压力竞争肯定都会接踵而来,自己能否顶得住呢?

我们的班主任也“闪亮登场”了,她就是荣获“安徽省教坛新星”的李老师。她的风趣和教学的高水平以及待人的亲切感,很快的打动了我,让我很快有了一点的温暖。

新学期开始了,生命记录在更新,一切都已成为过往,何必再去记挂呢?我将以一个全新的面貌来面对这即将开始的一切,展现一个全新的自我。

开学的第一天,一个崭新的一天;开学的第一天,一个有意义的一天;开学的第一天,一个惊讶与快乐的一天;开学的第一天,完美的结束,新的开始!

[高中高一开学作文

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篇15:我们应该做最好高中英语日记

全文共 743 字

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Whatever we are, we should do our best!

When I was a little girl ,I dreamed to grow up. Because I think a child doesn‘t has freedom,and can‘t do anything himself.

But now I have grown up, to my surprise, I feel more tired and have more suffering.Though I can do something myself, I don‘t feel happy at all.

I believe you also have the same thoughs with me. when we was a child , we wanted to grow up, but when we became a older man,we don‘t have such nice life as wish. So whatever we are children or adults, we should try to make our life better, and make ourselves more happy. we should try our best to study hard, then we can let parents have good life, too! Let‘s do our best to do ourself ! Believe yourself ! You are the best!

[我们应该做最好高中英语日记

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篇16:大学开学英语自我介绍

全文共 828 字

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I am ___________. I was born in _________ . I graduate from senior high school and major in English. I started learning English since I was 12 years old. My parents have a lot of American friends. That’s why I have no problem communicating with Americans or others by speaking English.

In my spare time, I like to do anything relating to English such as listening to English songs, watching English movies or TV programs, or even attending the activities held by some English clubs or institutes. I used to go abroad for a short- term English study. During that time, I learned a lot of daily life English and saw a lot of different things.

I think language is very interesting. I could express one substance by using different sounds. So I wish I could study and read more English literatures and enlarge my knowledge.

[大学开学英语自我介绍

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篇17:高中英语作文:动物园一日游

全文共 982 字

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There has been a long time for my family not to go out for the activity, because my father is busy all the time. But last week, my father finally finished his project, so that he could take a rest for some time.

My father advised us to go to the zoo, I was so excited, because I hadn’t seen many animals in my life.

In the zoo, there were so many people, it was so lively.

I saw the monkey, the giraffe and so on.

I saw these animals in the TV usually, but I saw them in front of me that day. The peacock impressed me so much, it looked homely when it laid down the ground, but when it stood up and opened the wings, it was so gorgeous. People said peacock was proud, indeed, it would not please people. I had a good time in the zoo.

对于我的家人来说,我们已经有很长一段时间没有外出活动了,因为爸爸总是很忙。

但是上周,我的爸爸终于完成了他的项目,所以他能休息一段时间。爸爸建议我们去动物园,我很兴奋,因为我目前还没有看到过很多动物。在动物园里,有很多人,非常热闹。我看到了猴子,长颈鹿等等。我平常在电视上看到这些动物,但是那天我亲眼看到了。

孔雀给我的印象很深刻,在它躺在地上的时候,看起来很普通,但是当它站起来,打开翅膀,是那么的美丽。人们说孔雀是傲慢的,确实,它不会取悦人们。在动物园里我度过了一段美好的时光。

[高中英语作文:动物园一日

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篇18:有关圣诞节英语作文高中

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Most westerners always celebrate Christmas Day as their major festival, in

order to memorialize Jesus. During that time, they always have several days off,

so they can enjoy this festival with all their hearts. The children often get

together with their friends. The adults are busy with decorating their houses.

They also send the postcards with their best wishes to each other. In the

streets, there are so many Fathers Christmas sending presents to the passers-by.

And everything is on a discount in the supermarkets. Thus the supermarkets are

the busiest places.

In the evening, the families usually have pudding, sandwiches, apple pies

and some other desserts for dinner. After supper, the families always sing and

dance around the Christmas tree. Sometimes, they also go to church. Before going

to bed, the children often hang up their stockings beside their bed, so that

Father Christmas will fill them with presents. It is said that Father Christmas

always drives a deer to the human world and entering into each house from the

chimney. Now the children no longer believe in Father Christmas, but they still

hang up their stockings, because their parents will fill them with presents.

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篇19:高中开学自我介绍范本

全文共 452 字

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各位同学:

大家好,我叫XX,我是个XX岁的男孩。为什么叫男孩呢,因为我的心还是很弱小的,没有经过岁月的磨练。我也快是个要成年的男人了,因为我有男人所有的优点,呵呵。

向大家自我介绍,其实我也很为难。因为我自己都不是很了解自己。在别人严重我可能永远是快乐的,乐观的。可是我的内心深处却经常为一些事伤心,焦虑,烦恼,甚至死心!我认为正式因为有痛苦才会有快乐,人生好比两杯酒,一杯苦酒,一杯甜酒。只是看你先喝哪一杯。

人生可以分为七个阶段,幼年、童年少年、青年、成年、中年、老年。我们处于青年,是塑造我们人生价值关和目标的时候,我们以后将要成为一个怎样的人,主要的决定因素都会在接下来的高中三年中发生,所以我很期待以后的高中生活。

2014开学自我介绍范文精选2014开学自我介绍范文精选我喜欢回忆我的少年,回忆我的少年带给我的无数的快乐;而我更向往早点变成一个成年人,因为成年了就能做自己喜欢的事,不再受别人的牵制和约束。

我的自我介绍比较简短,大家是否想和我叫朋友呢?那就来认识认识我吧,我也很希望能和大家交朋友。

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篇20:保护海洋高中英语作文

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Oceans becoming more acidicThe worlds oceans are slowly getting more acidic, say scientists.The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere.The lowering of the waters pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn.Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature.Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater.

Once in the water, it reacts to form carbonic acid.Scientists believe that the oceans have already become slightly more acidic over the last century.But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change."This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira."And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts."If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn.It is not absolutely clear what that means for marine life, however.

Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes.Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH.In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming.But Dr Caldeira said that such a strategy should now be re-considered."Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing - because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.

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