导航:首页 > 英语六级 > 优美四六级英语文段

优美四六级英语文段

发布时间:2021-01-05 15:59:16

『壹』 英语四六级常用作文优美句带中文

With time goes by, it becomes a bit hard for me to remember everything about myself at the first day of my college life. However, there was one thing for sure that I did feel quite excited and curious about my university. There is no doubt that students like me have struggled for a long time so that can be permitted to enter the university.

『贰』 英语四六级的高分作文范文有哪些 高分作文推荐

那可多了不如学习方法
拿一篇以前练习的作文来举例,按六级作文满分107分算,写的水平应该在73-83分之间。对于过分数线来说绰绰有余。你们看一下内容和语法,很普通。所以只要下一周功夫背点作文常用词汇常用句式,谁都能得个差不多的分。
关键在于,
1.单词拼写要正确。形容词动词名词,搞清楚。
2.语法正确。英语不像中文可以没有主语,英语句子必须有主语!
3.连接词使用,如本文recently conversely however what is more 等
4.句式使用。比如同一篇文章里分别有被动句,从句,虚拟语气,强调句。
英语多用被动句式,中文多用主动句式。
5.字迹工整,分段明确(3段或4段)
6.字数190-200字。我知道卷面要求150字就行,但是想多得点分的相信我,尽量写到190。(本文写了211词,有点冒)
7.用陈述句,不要像小学生一样用疑问句。
8.词汇能变化多样最好,比如think 可以换成believe hold reckon maintain argue claim 等等。
9.每段第一句话不要有错误!!

好啦,初等水平六级作文一篇如下:
最常考作文有两种 对立观点 和解决问题。
这篇是对立观点。问我们应不应该去扶跌倒老人。

『叁』 英语关于四季的优美句段

1... the spring, the summer,
The chilling autumn, angry winter, change
Their wonted liveries; and the mazed world
By their increase, now knows not which is which.
- William Shakespeare, A Midsummer Night's Dream

2.No matter how long the winter, spring is sure to follow.
- Proverb from Guinea

3.Spring passes and one remembers one's innocence
Summer passes and one remembers one's exuberance
Autumn passes and one remembers one's reverence
Winter passes and one remembers one's perseverance.
- Yoko Ono, Season of Glass

4.Winter is an etching, spring a watercolor, summer an oil painting
and autumn a mosaic of them all.
- Stanley Horowitz

5.For man, autumn is a time of harvest, of gathering together.
For nature, it is a time of sowing, of scattering abroad.
- Edwin Way Teale

6.There is a harmony
In autumn, and a lustre in its sky,
Which through the summer is not heard or seen,
As if it could not be, as if it had not been!
- Percy Bysshe Shelley

7.Delicious autumn! My very soul is wedded to it,
and if I were a bird I would fly about the earth
seeking the successive autumns.
- George Eliot

8.Winter is cold-hearted.
Spring is yea and nay,
Autumn is a weather-cock,
Blown every way.
Summer days for me.
When every leaf is on its tree.

- Christina Rossetti

9.Then summer fades and passes and October comes. We'll smell smoke then,
and feel an unexpected sharpness, a thrill of nervousness, swift elation, a
sense of sadness and departure.
- Thomas Wolfe

10. autumn is leaving
tugging each others' branches
two pine trees

- Shiki's Autumn Poem

『肆』 急求英语作文一篇.(四六级水平)

英语作文 英语作文的基本要求:
首先,一个段落必须有一个中心即主题思想,该中心由主题句特别是其中的题旨来表达。整个段落必须紧扣这个主题(stick or hold to the topic),这就是段落的统一性(unity)。其次,一个段落必须有若干推展句,使主题思想得到充分展开,从而给读者一个完整的感觉,这就是完整性(completeness or adequateness)。再者,一个段落不是杂乱无章的,而是有机的组合,句子的排列顺序必须合乎逻辑,从一个句子到另一个句子的过渡必须流畅(smooth),这就是连贯性(coherence)。下面我们就对这三个标准分别加以说明。
1、统一性
一个段落内的各个句子必须从属于一个中心,任何游离于中心思想之外的句子都是不可取的。请看下例:
Joe and I decided to take the long trip we'd always wanted across the country. We were like young kids buying our camper and stocking it with all the necessities of life. Bella bakes the best rhubarb pie. We started out in early spring from Minneapolis and headed west across the northern part of the country. We both enjoyed those people we met at the trailer park. Joe received a watch at his retirement dinner. To our surprise, we found that we liked the warm southern regions very much, and so we decided to stay here in New Mexico.
本段的主题句是段首句,controlling idea(中心思想)是take the long trip across the country。文中出现两个irrelevant sentences,一个是Bella bakes the best rhubarb pie,这一段是讲的是Joe and I ,中间出现一个Bella是不合适的。还有,Joe received a watch at his retirement dinner这一句更是与主题句不相关。再看一个例子:
My name is Roseanna, and I like to keep physically fit. I used to weigh two hundred pounds, but I joined the YMCA for an exercise class and diet program. In one year I lost eighty pounds. I feel much better and never want to have that much weight on my five-feet frame again. I bought two new suitcases last week. Everyday I practice jogging three miles, swimming fifteen laps, lifting twenty-pound weights and playing tennis for one hour. My mother was a premature baby.
本段的controlling idea 是like to deep physically fit,但段中有两个irrelevant sentences,一个是I bought two new suitcases last week,另一个是My mother was a premature baby。
从上面两个例子可以看出,native speakers同样会造出来irrelevant sentences。卷面上如果这种句子多了,造成偏题或离题,那问题就更严重了。
2、完整性
正象我们前面说得那样,一个段落的主题思想靠推展句来实现,如果只有主题句而没有推展句来进一步交待和充实,就不能构成一个完整的段落。同样,虽然有推展句,但主题思想没有得到相对圆满的交待,给读者一种意犹未尽的感觉。这样的段落也不能完成其交际功能。例如:
Physical work can be a useful form of therapy for a mind in turmoil. Work concentrates your thoughts on a concrete task. Besides, it is more useful to work —— you proce something rather than more anxiety or depression.
本段的主题句是段首句。本段的两个推展句均不能回答主题句中提出的问题。什么是“a mind in turmoil”(心境不平静)Physical work又如何能改变这种情况?为什么它能起therapy的作用?读者得不到明确的答案。因此,要达到完整就必须尽可能地简明。例如:
It is not always true that a good picture is worth a thousand words. Often writing is much clearer than a picture. It is sometimes difficult to figure out what a picture means, but a careful writer can almost always explain it.
段首句所表达的主题思想是一种看法,必须有具体事例加以验证。上述两个推展句只是在文字上对主题作些解释,整个段落内容空洞,简而不明。如果用一两个具体的例子的话,就可以把主题解释清楚了。比如下段:
It is not always true that a picture is worth a thousand words. Sometimes, pictures are pretty useless things. If you can't swim and fall in the river and start gulping water, will you be better off to hold up a picture of yourself drowning, or start screaming "Help"?
3、连贯性(coherence)
连贯性包括意连和形连两个方面,前者指的是内在的逻辑性,后者指的是使用转换词语。当然这两者常常是不可分割的。只有形连而没有意连,句子之间就没有内在的有机的联系;反之,只有意连而没有形连,有时行文就不够流畅。
1)、意连
段落中句子的排列应遵循一定的次序,不能想到什么就写什么。如果在下笔之前没有构思,边写边想,写写停停,那就写不出一气呵成的好文章来。下面介绍几种常见的排列方式。
A.按时间先后排列(chronological arrangement)
We had a number of close calls that day. When we rose, it was obviously late and we had to hurry so as not to miss breakfast; we knew the dining room staff was strict about closing at nine o'clock. Then, when we had been driving in the desert for nearly two hours —— it must have been close to noon —— the heat nearly hid us in; the radiator boiled over and we had to use most of our drinking water to cool it down. By the time we reached the mountain, it was our o'clock and we were exhausted. Here, judgement ran out of us and we started the tough climb to the summit, not realizing that darkness came suddenly in the desert. Sure enough, by six we were struggling and Andrew very nearly went down a steep cliff, dragging Mohammed and me along with him. By nine, when the wind howled across the flat ledge of the summit, we knew as we shivered together for warmth that it had not been our lucky day.
本段从“rose”(起床)写起,然后是吃早餐(“not to miss breakfast”, “closing at nine o'clock”),然后是“close to noon”,一直写到这一天结束(“By nine——”)。
B. 按位置远近排列(spatial arrangement)。例如:
From a distance, it looked like a skinny tube, but as we got closer, we could see it flesh out before our eyes. It was tubular, all right, but fatter than we could see from far away. Furthermore, we were also astonished to notice that the building was really in two parts: a pagoda sitting on top of a tubular one-story structure. Standing ten feet away, we could marvel at how much of the pagoda was made up of glass windows. Almost everything under the wonderful Chinese roof was made of glass, unlike the tube that it was sitting on, which only had four. Inside, the tube was gloomy, because of the lack of light. Then a steep, narrow staircase took us up inside the pagoda and the light changed dramatically. All those windows let in a flood of sunshine and we could see out for miles across the flat land.
本段的写法是由远及近,从远处(“from a distance”)写起,然后“get closer”,再到(“ten feet away”),最后是“inside the pagoda”……当然,按位置远近来写不等于都是由远及近。根据需要,也可以由近及远,由表及里等等。
C. 按逻辑关系排列(logical arrangement)
a. 按重要性顺序排列(arrangement in order of importance)
If you work as a soda jerker, you will, of course, not need much skill in expressing yourself to be effective. If you work on a machine, your ability to express yourself will be of little importance. But as soon as you move one step up from the bottom, your effectiveness depends on your ability to reach others through the spoken or the written word. And the further away your job is from manual work, the larger the organization of which you are an employee, the more important it will be that you know how to convey your thoughts in writing or speaking. In the very large business organization, whether it is the government, the large corporation, or the Army, this ability to express oneself is perhaps the most important of all the skills a man can possess.
这一段谈的是表达能力,它的重要性与职业,身份有关,从“not need much skill”或“of little importance”到“more important”,最后是“most important”。
b.由一般到特殊排列(general-to-specific arrangement)
If a reader is lost, it is generally because the writer has not been careful enough to keep him on the path. This carelessness can take any number of forms. Perhaps a sentence is so excessively cluttered that the reader, hacking his way through the verbiage, simply doesn't know what it means. Perhaps a sentence has been so shoddily constructed that the reader could read it in any of several ways. Perhaps the writer has switched tenses, or has switched pronouns in mid-sentence, so the reader loses track of when the action took place or who is talking. Perhaps sentence B is not logical sequel to sentence A —— the writer, in whose head the connection is clear, has not bothered to provide the missing link. Perhaps the writer has used an important word incorrectly by not taking the trouble to look it up. He may think that "sanguine" and "sanguinary" mean the same thing, but the difference is a bloody big one. The reader can only infer what the writer is trying to imply.
这一段谈的是a writer's carelessness,先给出一个general statement作为主题句,然后通过5个 ”perhaps”加以例证。
c. 由特殊到一般排列(specific-to-general arrangement)
I do not understand why people confuse my Siamese cat, Prissy, with the one I had several years ago, Henry. The two cats are only alike in breed. Prissy, a quiet, feminine feline, loves me dearly but not possessively. She likes to keep her distance from people, exert her independence and is never so rude as to beg, lick, or sniff unceremoniously. Her usual posture is sitting upright, eyes closed, perfectly still. Prissy is a very proper cat. Henry, on the other hand, loved me dearly but possessively. He was my shadow from morning till night. He expected me to constantly entertain him. Henry never cared who saw him do anything, whether it was decorous or not, and he usually offended my friends in some way. The cat made himself quite comfortable, on the top of the television, across stranger's feet or laps, in beds, drawers, sacks, closets, or nooks. The difference between them is imperceptible to strangers.
本段的主题句是段首句,它仅提出一个问题:为什么两只猫会被搞混。然后对两者进行比较,末句才下结论。
2)、形连
行文的逻辑性常常要靠适当的转换词语及其他手段来实现。请读下面这一段文字并找出文中用以承上启下的词语:
Walter's goal in life was to become a successful surgeon. First, though, he had to get through high school, so he concentrated all his efforts on his studies —— in particular, biology, chemistry, and math. Because he worked constantly on these subjects, Walter became proficient in them; however, Walter forgot that he needed to master other subjects besides those he had chosen. As a result, ring his junior year of high school, Walter failed both English and Latin. Consequently, he had to repeat these subjects and he was almost unable to graate on schele. Finally, on June 6, Walter achieved the first step toward realizing his goal.
本文中起承上启下的词语有两种,一种是转换词语(transitional words or phrases),另一种是起转换作用的其他连接手段(linking devices)。前者依次有:first, though, so, in particular, and, because, however, besides, as a result, both…and, consequently, and, finally.后者依次是:he, he, his, his, he, these, them, he, those, his, he, these, his. 本段中共有词汇105个,所使用的转换词语及其他连接用语共26个词,约占该段总词汇量的四分之一。由此可见,掌握好transitions不仅对行文的流(smoothness)有益,而且对于学生在半个小时内写120个词也是不无好处的。
一个段落里如果没有transitions也就很难有coherence了.我们看下面一个例子:
Speaking and writing are different in many ways. Speech depends on sounds. Writing uses written symbols. Speech developed about 500 000 years ago. Written language is a recent development. It was invented only about six thousand years ago. Speech is usually informal. The word choice of writing is often relatively formal. Pronunciation and accent often tell where the speaker is from. Pronunciation and accent are ignored in writing. A standard diction and spelling system prevails in the written language of most countries. Speech relies on gesture, loudness, and rise and fall of the voice. Writing lacks gesture, loudness and the rise and fall of the voice. Careful speakers and writers are aware of the differences.
本段中除了第6句开头出现一个起过渡作用的”it”之外,没有使用其他的过渡词语.这样,文中出现许多重复的词语,全段读起来也显得生硬而不自然。如果加上必要的过渡词语来修饰的话,这一段就成了下面一个流畅连贯的段落:
Speaking and writing are different in many ways. Speech depends on sounds; writing, on the other hand, uses written symbols. Speech was developed about 500 000 years ago, but written language is a recent development, invented only about six thousand years ago. Speech is usually informal, while the word choice of writing, by contrast, is often relatively formal. Although pronunciation and accent often tell where the speaker is from, they are ignored in wiring because a standard diction and spelling system prevails in most countries. Speech relies on gesture, loudness, and the rise and fall of the voice, but writing lacks these features. Careful speakers and writers are aware of the differences.
4、有损连贯性的几种情况:
考生在写作中经常出现下面几种错误:
1、不必要的改变时态,比如:
In the movie, Robert Redford was a spy. He goes to his office where he found everybody dead. Other spies wanted to kill him, so he takes refuge with Julie Christie. At her house, he had waited for the heat to die down, but they come after him anyway.
2、不必要的改变单复数,比如:
Everybody looks for satisfaction in his life. They want to be happy. But if he seeks only pleasure in the short run, the person will soon run out of pleasure and life will catch up to him. They need to pursue the deeper pleasure of satisfaction in work and in relationships.
3、不必要的改变人称,比如:
Now more than ever, parents need to be in touch with their children's activities because modern life has the tendency to cause cleavages in the family. You need to arrange family like it so that family members will do things together and know one another. You need to give up isolated pleasures of your own and realize that parents have a set of obligations to sponsor togetherness and therefore sponsor knowledge.
因此写作中,一定要注意时态,人称以及数的变化是否正确,要注意保持一致。
英语作文的书写格式
英文书写应符合书写规范,英文字母要写清楚、写整齐、写美观,字母的大小和字母之间的距离要匀称。书写应做到字形秀丽漂亮,通篇匀称和谐。
写英文字母要掌握正确笔顺。如字母i,应该先写下面的部分,然后再打点。有的学生却按写汉字的习惯从上到下写,写快了,就会把点和下面的十笔连在量起,显得十分别扭。字形t应为两笔。不少人却将两笔合成一笔,看上去不像t,倒像l或是e,难以辨认。另外,把r写成v,把q写成把g,把k写成h等等,都是中学生书写中常见的毛病。
不少人在四线三格的练习纸上书写尚有规矩,能按字母的占格、高低和大小要求书写,但在白纸或横线纸上书写,却显得十分幼稚拙劣。字母或跳上跳下,或一律写成同一高度,占上中两格的字母与占中下两格的字母完全没有高低之别。这些现象都要防止。
另外,书写时还要注意词与词之间要保持一定的距离,不能紧靠在一起。字母之间的连写也应该按照习惯,不能随意乱来。
在一篇字数有限的作文里,我们还要注意尽量不把一个单词拆开移行。万一要移行,则必须以音节为单位进行,如revolution这个词,依照音节移行的原则可以按re-,revo-, revolu-这几种方法移行。在移行时,我们还应特别注意以下几点:
1. 单音节词不能移行,即使是字母较多的单音节词,如through等也不能例外。
2.缩略词如Mr.,Dr.等不能和后面的名字拆开移行。
缩略的专用名词如U.K.,U.S.A等也不能拆开移行。
3.时间、量度及货币单位应视为一个整体;不能分开移行。如;
11:00P.M.应写在一行内,不能将11:00和P.M.分开移行;写38℃时,不能将38和℃分开移行。
4.由“年、月、日”表示的日期,如果必须分开移行只能将“月、日”与“年”分开。如January 6,1980不能将January和6分开移行,但可以把January 6,和1980分成两行。
5.含双写辅音字母的单词,在移行时要将辅音字母拆开。如better可拆成better,necessary可拆成necessary。
但如果双写辅音字母属于词根,后面又加了后缀,就不能将两个辅音字母拆开。如drill加上-ing后构成了drilling,就不可以将它拆成成dril-ling,而只能拆为drilling。
例文:
1.宠物:
A Talkative Parrot
A lady worked in a company. There were a lot of shops on her way to work. One morning, when she was walking to work, she passed by a new pet shop. She was so excited when she saw a parrot sitting beside the door. She really loved birds.
When she stopped to look at the handsome bird, it said to her, "Hey, lady, you are really ugly.”
This made the lady very angry. She quickly left the shop and went to work. On her way home, she passed the same pet shop again. This time the parrot saw her again, it said immediately:
"Hey lady, you are really ugly!"
The lady tried to control herself. She walked to the shopkeeper and told him that if the parrot said it again, she would have the police come and take it away. "I'm so sorry, madam. I promise it won't happen again," the shopkeeper said.
The next morning, when the lady walked past the pet shop, she pretended that she didn’t see it. But the parrot saw her at once and said to her quickly, "Hey lady."
She stopped and looked at the bird coldly. "Yes?" she answered in an angry voice.
The bird, sitting up straight and smiling at her, said, "You know."
2.人物:
Elizabeth Bennet (伊丽莎白)
The second daughter in the Bennet family, and the most intelligent and quick-witted, Elizabeth is the protagonist of Pride and Prejudice and one of the most well-known female characters in English literature. Her admirable qualities are numerous—she is lovely, clever, and, in a novel defined by dialogue, she converses as brilliantly as anyone. Her honesty, virtue, and lively wit enable her to rise above the nonsense and bad behavior that pervade her class-bound and often spiteful society. Nevertheless, her sharp tongue and tendency to make hasty judgments often lead her astray; Pride and Prejudice is essentially the story of how she (and her true love, Darcy) overcome all obstacles—including their own personal failings—to find romantic happiness. Elizabeth must not only cope with a hopeless mother, a distant father, two badly behaved younger siblings, and several snobbish, antagonizing females, she must also overcome her own mistaken impressions of Darcy, which initially lead her to reject his proposals of marriage. Her charms are sufficient to keep him interested, fortunately, while she navigates familial and social turmoil. As she graally comes to recognize the nobility of Darcy’s character, she realizes the error of her initial prejudice against him.
Bennet家庭的第二个女儿和最聪明和机智,伊丽莎白是自豪感和偏见的主演和其中一个在英国文学的最知名的女性角色。 她令人敬佩的质量是numerous—she是可爱的,聪明,并且,在对话定义的小说,她一样精采地交谈象任何人。 她的诚实、美德和活泼的机智使她在胡话之上起来,并且弥漫她的坏行为类跳起和经常恶意的社会。 然而,她的伶俐的口舌和倾向经常做仓促评断带领她迷路; 自豪感和偏见本质上是故事她(和她真实的爱, Darcy)怎样克服他们自己的个人failings—to发现浪漫幸福的所有obstacles—including。 伊丽莎白必须不仅应付一个绝望的母亲,一个遥远的父亲,二非常表现的更加年轻的兄弟姐妹,并且几位势利,对抗的女性,她必须也克服Darcy她自己的错误印象,最初带领她拒绝他的求婚。 而她驾驶家族和社会动乱,她魅力是充足保持他感兴趣,幸运地。 当她逐渐来认可Darcy’s字符的贵族,她体会她对他的最初的偏见错误。

『伍』 有没有关于英语四、六级的精品短文,并附带翻译的,谢谢!!!

01 The Language of Music

A painter hangs his or her finished pictures on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed. Professional singers and players have great responsibilities, for the composer is utterly dependent on them. A student of music needs as long and as arous a training to become a performer as a medical student needs to become a doctor. Most training is concerned with technique, for musicians have to have the muscular proficiency of an athlete or a ballet dancer. Singers practice breathing every day, as their vocal chords would be inadequate without controlled muscular support. String players practice moving the fingers of the left hand up and down, while drawing the bow to and fro with the right arm-two entirely different movements.

Singers and instruments have to be able to get every note perfectly in tune. Pianists are spared this particular anxiety, for the notes are already there, waiting for them, and it is the piano tuner’s responsibility to tune the instrument for them. But they have their own difficulties; the hammers that hit the string have to be coaxed not to sound like percussion, and each overlapping tone has to sound clear.

This problem of getting clear texture is one that confronts student conctors: they have to learn to know every note of the music and how it should sound, and they have to aim at controlling these sounds with fanatical but selfless authority.

Technique is of no use unless it is combined with musical knowledge and understanding. Great artists are those who are so thoroughly at home in the language of music that they can enjoy performing works written in any century.
01 的语言音乐 一位画家挂在墙上,他或她完成的图片和每个人都可以看到它。作曲家写工作,但是没有人能听到它,直到它执行。专业歌手和球员有很大的责任,作曲家是完全依赖于它们。音乐的学生需要长时间和作为艰苦训练,成为一个表演者,作为一个医学学生需要成为一名医生。大多数培训与技术,为音乐家必须有一名运动员或芭蕾舞演员的肌肉水平有关。呼吸每一天,作为其声带的歌手实践,将没有控制肌肉的支持不足。字符串球员练习移动的左手手指向上和向下,同时吸取弓来来回回的右手臂-两个完全不同的运动。
歌手和文书必须能够获取每个音符完全合拍。钢琴家被姑息这种特定的焦虑,注意到已经存在,等待对他们来说,和钢琴调谐器有责任为他们调整该文书。但他们有自己的困难 ;命中该字符串的锤子要哄不到像打击乐,声音,每个重叠的语气听起来清晰。
这问题越来越清楚了解纹理是面对学生导体: 他们学习了解音乐和它应如何健全的每一个音符,都旨在控制这些声音与狂热但无私的权力机构。
技术是没有用的除非结合音乐的认识和了解。伟大的艺术家是那些这样彻底的家中,他们可以享受音乐的语言执行任何世纪的作品。
02 Schooling and Ecation

It is commonly believed in United States that school is where people go to get an ecation. Nevertheless, it has been said that today children interrupt their ecation to go to school. The distinction between schooling and ecation implied by this remark is important.

Ecation is much more open-ended and all-inclusive than schooling. Ecation knows no bounds. It can take place anywhere, whether in the shower or in the job, whether in a kitchen or on a tractor. It includes both the formal learning that takes place in schools and the whole universe of informal learning. The agents of ecation can range from a revered grandparent to the people debating politics on the radio, from a child to a distinguished scientist. Whereas schooling has a certain predictability, ecation quite often proces surprises. A chance conversation with a stranger may lead a person to discover how little is known of other religions. People are engaged in ecation from infancy on. Ecation, then, is a very broad, inclusive term. It is a lifelong process, a process that starts long before the start of school, and one that should be an integral part of one’s entire life.

Schooling, on the other hand, is a specific, formalized process, whose general pattern varies little from one setting to the next. Throughout a country, children arrive at school at approximately the same time, take assigned seats, are taught by an alt, use similar textbooks, do homework, take exams, and so on. The slices of reality that are to be learned, whether they are the alphabet or an understanding of the working of government, have usually been limited by the boundaries of the subject being taught. For example, high school students know that they are not likely to find out in their classes the truth about political problems in their communities or what the newest filmmakers are experimenting with. There are definite conditions surrounding the formalized process of schooling.
02 学校教育和教育 它通常认为在美国学校是人们到哪里去获得教育。不过,它说今天的儿童打断他们去学校的教育。学校教育和隐含的这句话的教育之间的区别很重要。
教育是不限成员名额和包容比上学得多。教育毫无止境。它可以在任何地方,无论是在淋浴或在工作时,是否在厨房或拖拉机上。它包括两个正规教育,在学校和非正式学习了整个宇宙。教育的代理人是德高望重范围可到进行的电台节目,从子到一个杰出的科学家的政治辩论的人。而教育也有一定的可预测性,教育往往会产生的惊喜。一个陌生人的机会谈话可能让人发现很少知道的其他宗教。人们正在从对婴儿的教育。那么,教育是一个非常广泛的、 包容性的术语。它是学校的一个终身过程,很久以前,开始启动一个进程,应该是学校的整个生活的一个组成部分的一个。
学校教育,另一方面,是一个具体的、 正式的过程,其一般模式变化少从到下一个设置。全国儿童在大约在同一时间到达学校,以分配的席位,教的成人、 使用类似教科书、 做作业、 采取考试,等等。由边界正在教的主题,是需要学习,无论他们是字母表或对政府的工作的理解现实的切片通常都会受限于。例如,高中学生知道他们不可能找出它们的类在他们的社区或最新的电影工作者正在试验的政治问题的真相。有明确条件周围形式化学校教育的过程。
03 The Definition of “Price”

Prices determine how resources are to be used. They are also the means by which procts and services that are in limited supply are rationed among buyers. The price system of the United States is a complex network composed of the prices of all the procts bought and sold in the economy as well as those of a myriad of services, including labor, professional, transportation, and public-utility services. The interrelationships of all these prices make up the “system” of prices. The price of any particular proct or service is linked to a broad, complicated system of prices in which everything seems to depend more or less upon everything else.

If one were to ask a group of randomly selected indivials to define “price”, many would reply that price is an amount of money paid by the buyer to the seller of a proct or service or, in other words that price is the money values of a proct or service as agreed upon in a market transaction. This definition is, of course, valid as far as it goes. For a complete understanding of a price in any particular transaction, much more than the amount of money involved must be known. Both the buyer and the seller should be familiar with not only the money amount, but with the amount and quality of the proct or service to be exchanged, the time and place at which the exchange will take place and payment will be made, the form of money to be used, the credit terms and discounts that apply to the transaction, guarantees on the proct or service, delivery terms(交货期限), return privileges, and other factors. In other words, both buyer and seller should be fully aware of all the factors that comprise the total “package” being exchanged for the asked-for amount of money in order that they may evaluate a given price(计算价,特定价).
03 的"价格"的定义
价格确定如何使用资源。他们也是其中的产品和服务在供应有限的配给买家之间的手段。美国的价格体系是一个复杂的网络组成的购买和出售的经济以及那些无数的服务,包括劳动、 专业、 运输和公共事业服务的所有产品的价格。所有这些价格之间的相互关系构成了价格的"系统"。任何特定的产品或服务的价格挂钩,一切似乎更多或更少依赖其他一切的价格广泛、 复杂的系统。
如果一个问一组随机选定的个人来定义"价格",许多人将答复价格是金额由买方支付给卖方的产品或服务,或者换句话说,价格是货币值的产品或服务在市场交易中商定。当然,这个定义是有效一样不言而喻。对于任何特定的交易价格的全面理解,必须知道远不止涉及的金额。买方和卖方应熟悉不仅钱数额,但数量和质量的产品或服务必须在交换,时间和地点的交流将采取地方和付款将提出,钱要使用的窗体的信贷条件和适用于该交易的折扣保证对产品或服务,交付 terms(交货期限) 返回权限和其他因素。换句话说,买方和卖方应充分认识到包括"包",以便他们可以评价一个给定的价格换的要求的金额总数的所有因素

『陆』 历年四六级英语美文

科学调查表明,一颗钮扣电池弃入大自然后,可以污染60万升水,相当于一个人一生的用水量。而中国每年要消耗这样的电池70亿只……

目前我国电池生产企业有1400多家,1999年产量已达到150亿节。我国约有3.66亿个家庭每年大约需要电池近44亿节。而且多数在国内消耗。与世界不少国家相比,我国废电池回收率极低。据了解,我国生产的电池有96%为锌锰电池和碱锰电池,其主要成分为锰、汞、锌、铬等重金属。废电池无论埋在大气中还是深埋在地下,其重金属成分都会随渗液溢出,造成地下水和土壤的污染,日积月累,会严重危害人类健康。

1、 废旧电池污染环境的途径

这些电池的组成物质在使用过程中,被封存在电池壳内部,并不会对环境造成影响。但经过长期机械磨损和腐蚀,使得内部的重金属和酸碱等泄露出来,进入土壤或水源,就会通过各种途进入人的食物链。全过程简述如下:电池进入土壤或水源——微生物——动物——循环粉尘——农作物——食物——人体——神经——沉积并发病。
其它水源植物食品消化生物从环境中摄取的重金属可以经过食物链的生物放大作用,逐级在较高级的生物中成千上万地富积,然后经过食物进入人的身体,在某些器官中积蓄造成慢性中毒。日本的水俣病就是汞中毒的典型案例。

2、 废旧电池对人的危害性

1998年《国家危险废物名录》上定出汞、镉、锌、铅、铬危险废弃物:

汞:汞即水银,是一种液体金属。比重13.6,熔点-39.3摄氏度、沸点357摄氏度。汞在常温下即可蒸发,其蒸气无色无味,比空气重七倍。汞及其化合物毒性都很大,特别是汞的有机化合物毒性更大。鱼在含汞量0.01-0.02毫克/升的水中生活就会中毒;人若食用0.1克汞就会中毒致死。汞及其化合物可通过呼吸道、皮肤或消化道等不同途径侵入人体。当汞进入人体后,即集聚于肝、肾、大脑、心脏和骨髓等部位,造成神经性中毒和深部组织病变,引起疲倦,头晕、颤抖、牙龈出血、秃发、手脚麻痹、神经衰弱等症状,甚至会出现精神混乱,进而疯狂痉挛致死。有机汞还能进入胎盘,使胎儿先天性汞中毒,或畸形,或痴呆。汞的毒性是积累性的,往往要几年或十几年才能反应出来。食物链对汞有相当大的富集能力。如淡水鱼和浮游植物对汞的富集倍数为一千,淡水无脊椎动物为十万,海洋植物为一百,海洋动物为二十万。食用被汞污染的水产品,产生甲基汞中毒,关.头晕,四肢末梢麻木,记忆力减退,神经错乱,甚至死亡,还影响孕妇胎儿畸形。 家庭中常用的水银体温计,就很危险!

铅:铅的分子量是278,是一个重金属元素,重金属元素进入人体内会使体内的蛋白质发生变性,也就是使蛋白质正常功能受到损坏,从而使人体不能发挥正常的功能。食用含铅食物,会影响酶及正常血红素合成,影响神系统,铅在骨骼及肾脏中积累,有潜在的长期影响。

3、 废旧电池危害其它表现

一粒钮扣电池可污染60万升水,等于一个人一生饮水量。一节一号电池烂在地里,能使一平方米的土地失去利用价值。目前世界上生活垃圾处理主要是卫生填埋、再利用、堆肥和焚烧这四种方式,混入生活垃圾的废旧电池在这四个过程中的污染作用体现如下:

填埋:废旧电池的重金属通过渗滤作用污染水体和土壤。

焚烧:废旧电池在高温下,腐蚀设备,某些得金属在焚烧炉中挥发在飞灰中,造成大气污染

堆肥:主要原料是生活垃圾,垃圾和旧电池堆肥后成为有机肥料,被农民施入大田土壤,重金属被农作物吸收,进入我们的食物链。 回答者: 热心网友 | 2010-5-23 12:42
一颗钮扣电池弃入大自然后,可以污染60万升水,相当于一个人一生的用水量。而中国每年要消耗这样的电池70亿只…… 电池中含有汞,汞:汞即水银,是一种液体金属。比重13.6,熔点-39.3℃、沸点357℃。汞在常温下即可蒸发,其蒸气无色无味,比空气重七倍。汞及其化合物毒性都很大,特别是汞的有机化合物毒性更大。鱼在含汞量0.01-0.02毫克/升的水中生活就会中毒;人若食用0.1克汞就会中毒致死。
电池中还有镉:镉是一种毒性很大的重金属,其化合物也大都属毒性物质。震惊世界的日本“痛痛痛”就是因镉污染而致。……

废电池是危害我们生存环境的一大杀手!一粒小小的钮扣电池可污染600立方米水,相当于一个人一生的饮水量;一节一号电池烂在地里,能使一平方米的土地失去利用价值,并造成永久性公害。

在对自然环境威胁最大的几种物质中,电池里就包含了汞、铅、镉等多种,汞具有强烈的毒性,对人体中枢神经的破坏力很大,上世纪五十年代发生在日本的震惊中外的水俣病就是由于汞污染造成的;铅能造成神经紊乱、肾炎等;镉在人体内极易引起慢性中毒,主要病症是肺气肿、骨质软化、贫血,很可能使人体瘫痪;而铅进入人体后最难排泄,它干扰肾功能、生殖功能。若把废电池混入生活垃圾中一起填埋,久而久之,惨出的重金属可能污染地下水和土壤,进而进入鱼类、农作物中,破坏人类的生存环境,间接威胁到人类的健康。

电池在我们生活中的使用量正在迅速增加,已深入到我们生活和工作的每一个角落。我国是电池生产和消费大国,目前年产量达140亿枚,占世界产量1/3。如果以全国约3.6亿个家庭,每户每年用10枚计,消费量已是36亿。若加上集团消费,每年"涌现"上百亿枚废旧电池当不在话下。这些电池若未得到妥善处理,将直接或间接地危害人们的身体健康。实施并倡导废旧电池分类收集活动为越来越多的人们所认识,并得到越来越多的重视、支持和参与。

从我做起,从身边每一件小事做起,是我们的座右铭。关爱身边环境、参与废旧电池的分类回收利用是我们每一个人的责任和义务。个人的行为也许微不足道,但把我们每个人的力量联合起来,便足以托起一种文明,一种与自然共生的文明,一种可持续发展的文明

废旧电池的危害主要集中在其中所含的少量的重金属上,如铅、汞、镉等。这些有毒物质通过各种途径进入人体内,长期积蓄难以排除,损害神经系统、造血功能和骨骼,甚至可以致癌。铅:神经系统(神经衰弱、手足麻木)、消化系统(消化不良、腹部绞痛)、血液中毒和其他的病变。汞:精神状态改变是汞中毒的一大症状。脉搏加快,肌肉颤动,口腔和消化系统病变。电池报废后若处理不当,汞会慢慢溢出进入土壤水体,将通过农作物进入食物链,给人体健康造成很大威胁。一节一号电他就可使一平方米土地失去农用价值。而人们食用了被汞污染的水、食物后,就会发生汞中毒,轻则出现怕羞、孤独、烦躁、抑郁、自觉口中有金属味等现象,重则出现手指、舌、眼、脑袋震颤等“汞毒性震颤”现象。镉、锰:主要危害神经系统。
以下列举几种电池的危害性:
1 钮扣电池 钮扣电池含有汞,当其废弃在自然界里,外层金属锈蚀后,汞就会慢慢从电池中溢出来,进入土壤或在下雨之后进入地下水,再通过农作物进入人体,损伤人的内 脏。在微生物的作用下,无机汞可以转变成甲基汞,聚积在鱼类的身体里,人食用了这种鱼后,甲基汞会进入人的大脑细胞,使人的神经系统受到严重破坏,重者会发疯致死。日本水俣病就是甲基汞所致。
2 充电电池 充电电池一般都含有有害重金属镉,在自然界中渗出后,污染土地和水流,最终进入人体。镉会使骨质疏松,并造成骨骼变形、骨痛,并引起肝和肾受损等等严重后果。
3 普通电池 普通干电池也含有汞,还含有铅和酸碱,对环境也很有害。因此,在发达国家,废旧电池被列为危险有毒废物,必须单独投放和回收处理,绝不能随便丢弃在自然界中。在德国,废旧电池可以送到每个卖电池的商店,这一点是值得我们借鉴的。

==

有关资料显示,一节一号电池烂在地里,能使1平方米的土壤永久失去利用价值;一粒纽扣电池可使600吨水受到污染,相当于一个人一生的饮水量。若将废旧电池(浑混)入生活垃圾一起填埋,或者随手丢弃,渗出的汞及重金属物质就会渗透于土壤、污染地下水,进而进入鱼类、农作物中,破坏人类的生存环境。

废电池的危害有多大

你知道废电池的危害有多大吗?你查过了吗?如果没查过,我告诉你:

据专家测定:一节钮扣电池如不经过很好的处理。扔进河里可以污染60万升水,相当于人一生中的饮水量。一节一号电池扔在泥土里能使一平方米的土地永远失去利用价值。如果植物吸收了土里的有害物质。人吃了已吸收有害物质的植物,就可能导致贫血等直接危害人体健康的病症。

一节一号电池如果已经失去了作用,可以送到回收部门。这样可以再利用60%的电量。

你看,废电池的危害有多大,从现在开始,从小事开始,让我们一起行动吧! 参考资料:http://..com/question/28749680.html 回答者: 905937825 | 一级 | 2010-5-24 20:47
废旧电池的危害性

一粒纽扣电池可污染60万升水,等于一个人一生的饮水量。一节电池烂在地里,能够使一平方米的土地失去利用价值,所以把一节节的废旧电池说成是“污染小炸弹”一点也不过分。

我们日常所用的普通干电池,主要有酸性锌锰电池和碱性锌锰电池两类,它们都含有汞、锰、镉、铅、锌等各种金属物质,废旧电池被遗弃后,电池的外壳会慢慢腐蚀,其中的重金属物质会逐渐渗入水体和土壤,造成污染。重金属污染的最大特点是它在自然界是不能降解,只能通过净化作用,将污染消除。

废旧电池的危害主要集中在其中所含的少量的重金属上

金属种类危害的表现


过量的锰蓄积于体内引起神经性功能障碍,早期表现为综合性功能紊乱。较重者出现两腿发沉,语言单调,表情呆板,感情冷漠,常伴有精神症状。


锌的盐类能使蛋白质沉淀,对皮膜粘膜有刺激作用。当在水中浓度超过10-50毫史/升时有致癌危险,可能引起化学性肺炎。铅:铅主要作用于神经系统、活血系统、消化系统和肝、肾等器官能抑制血红蛋白的合成代谢过程,还能直接作用于成熟红细胞,对婴幼儿影响甚大,它将导致儿童体格发育迟缓,慢性铅中毒可导致儿童的智力低下。


镍粉溶解于血液,参加体内循环,有较强的毒性,能损害中枢神经,引起血管变异,严重者导致癌症。


它在这些重金属污染物中是最值得一提的,这种重金属,对人类的危害,确实不浅,长期以来,我国在生产干电池时,要加入一种有毒的物质——汞或汞的化合物,我国的碱性干电池中的汞的含量达到1-5%,中性干电池为0.025%,全国每年用于生产干电池的汞具有明显的神经毒性,此外对内分泌系统、免疫系统等也有不良影响,1953年,发生在日本九州岛的震惊世界的水俣病事件,给人类敲响了汞污染的警钟。

重金属污染,威胁着人类的健康,人类如果忽视对重金属污染的控制,最终将吞下自酿的苦果,因此,加强废旧电池的回收就日显重要了。 参考资料:我 回答者: 32889991230000 | 二级 | 2010-6-3 20:08
废电池的危害:废弃在自然界电池中的汞会慢慢从电池中溢出来,进入土壤或水源,再通过农作物进入人体,损伤人的肾脏。在微生物的作用下,无机汞可以转化成甲基汞,聚集在鱼类的身体里,人食用了这种鱼后,甲基汞会进入人的大脑细胞,使人的神经系统受到严重破坏,重者会发疯致死。著名的日本水俣病就是甲基汞所致。镉渗出污染土地和水体,最终进入人体使人的肝和肾受损,也会引起骨质松软,重者造成骨骼变形。汽车废电池中含有酸和重金属铅泄漏到自然界可引起土壤和水源污染,最终对人造成危害。 回答者: 热心网友 | 2010-6-5 08:50
废电池的危害:废弃在自然界电池中的汞会慢慢从电池中溢出来,进入土壤或水源,再通过农作物进入人体,损伤人的肾脏。在微生物的作用下,无机汞可以转化成甲基汞,聚集在鱼类的身体里,人食用了这种鱼后,甲基汞会进入人的大脑细胞,使人的神经系统受到严重破坏,重者会发疯致死。著名的日本水俣病就是甲基汞所致。镉渗出污染土地和水体,最终进入人体使人的肝和肾受损,也会引起骨质松软,重者造成骨骼变形。汽车废电池中含有酸和重金属铅泄漏到自然界可引起土壤和水源污染,最终对人造成危害。

回收废电池:家用电器的普及和种类的增加,使得电池的使用量随之剧增。废电池混在垃圾中,不仅污染环境,而且也是浪费。全国电池年消耗量为30亿只,因无回收而丢失铜740吨、锌1.6万吨、锰粉9.7万吨。我们应该把废旧电池与其它垃圾分开,集中起来送去回收。许多国家都很重视废电池的回收。德国的很多商店要求顾客在购买电池时,同时要把废旧电池交回给商店;日本专有分类箱收集不同的废电池 科学调查表明,一颗钮扣电池弃入大自然后,可以污染60万升水,相当于一个人一生的用水量。而中国每年要消耗这样的电池70亿只……

目前我国电池生产企业有1400多家,1999年产量已达到150亿节。我国约有3.66亿个家庭每年大约需要电池近44亿节。而且多数在国内消耗。与世界不少国家相比,我国废电池回收率极低。据了解,我国生产的电池有96%为锌锰电池和碱锰电池,其主要成分为锰、汞、锌、铬等重金属。废电池无论埋在大气中还是深埋在地下,其重金属成分都会随渗液溢出,造成地下水和土壤的污染,日积月累,会严重危害人类健康。

1、 废旧电池污染环境的途径

这些电池的组成物质在使用过程中,被封存在电池壳内部,并不会对环境造成影响。但经过长期机械磨损和腐蚀,使得内部的重金属和酸碱等泄露出来,进入土壤或水源,就会通过各种途进入人的食物链。全过程简述如下:电池进入土壤或水源——微生物——动物——循环粉尘——农作物——食物——人体——神经——沉积并发病。
其它水源植物食品消化生物从环境中摄取的重金属可以经过食物链的生物放大作用,逐级在较高级的生物中成千上万地富积,然后经过食物进入人的身体,在某些器官中积蓄造成慢性中毒。日本的水俣病就是汞中毒的典型案例。

2、 废旧电池对人的危害性

1998年《国家危险废物名录》上定出汞、镉、锌、铅、铬危险废弃物:

汞:汞即水银,是一种液体金属。比重13.6,熔点-39.3摄氏度、沸点357摄氏度。汞在常温下即可蒸发,其蒸气无色无味,比空气重七倍。汞及其化合物毒性都很大,特别是汞的有机化合物毒性更大。鱼在含汞量0.01-0.02毫克/升的水中生活就会中毒;人若食用0.1克汞就会中毒致死。汞及其化合物可通过呼吸道、皮肤或消化道等不同途径侵入人体。当汞进入人体后,即集聚于肝、肾、大脑、心脏和骨髓等部位,造成神经性中毒和深部组织病变,引起疲倦,头晕、颤抖、牙龈出血、秃发、手脚麻痹、神经衰弱等症状,甚至会出现精神混乱,进而疯狂痉挛致死。有机汞还能进入胎盘,使胎儿先天性汞中毒,或畸形,或痴呆。汞的毒性是积累性的,往往要几年或十几年才能反应出来。食物链对汞有相当大的富集能力。如淡水鱼和浮游植物对汞的富集倍数为一千,淡水无脊椎动物为十万,海洋植物为一百,海洋动物为二十万。食用被汞污染的水产品,产生甲基汞中毒,关.头晕,四肢末梢麻木,记忆力减退,神经错乱,甚至死亡,还影响孕妇胎儿畸形。 家庭中常用的水银体温计,就很危险!

铅:铅的分子量是278,是一个重金属元素,重金属元素进入人体内会使体内的蛋白质发生变性,也就是使蛋白质正常功能受到损坏,从而使人体不能发挥正常的功能。食用含铅食物,会影响酶及正常血红素合成,影响神系统,铅在骨骼及肾脏中积累,有潜在的长期影响。

3、 废旧电池危害其它表现

一粒钮扣电池可污染60万升水,等于一个人一生饮水量。一节一号电池烂在地里,能使一平方米的土地失去利用价值。目前世界上生活垃圾处理主要是卫生填埋、再利用、堆肥和焚烧这四种方式,混入生活垃圾的废旧电池在这四个过程中的污染作用体现如下:

填埋:废旧电池的重金属通过渗滤作用污染水体和土壤。

焚烧:废旧电池在高温下,腐蚀设备,某些得金属在焚烧炉中挥发在飞灰中,造成大气污染

堆肥:主要原料是生活垃圾,垃圾和旧电池堆肥后成为有机肥料,被农民施入大田土壤,重金属被农作物吸收,进入我们的食物链。 回答者: piccjiangy | 一级 | 2010-6-5 10:38
废电池的危害:废弃在自然界电池中的汞会慢慢从电池中溢出来,进入土壤或水源,再通过农作物进入人体,损伤人的肾脏。在微生物的作用下,无机汞可以转化成甲基汞,聚集在鱼类的身体里,人食用了这种鱼后,甲基汞会进入人的大脑细胞,使人的神经系统受到严重破坏,重者会发疯致死。著名的日本水俣病就是甲基汞所致。镉渗出污染土地和水体,最终进入人体使人的肝和肾受损,也会引起骨质松软,重者造成骨骼变形。汽车废电池中含有酸和重金属铅泄漏到自然界可引起土壤和水源污染,最终对人造成危害。

回收废电池:家用电器的普及和种类的增加,使得电池的使用量随之剧增。废电池混在垃圾中,不仅污染环境,而且也是浪费。全国电池年消耗量为30亿只,因无回收而丢失铜740吨、锌1.6万吨、锰粉9.7万吨。我们应该把废旧电池与其它垃圾分开,集中起来送去回收。许多国家都很重视废电池的回收。德国的很多商店要求顾客在购买电池时,同时要把废旧电池交回给商店;日本专有分类箱收集不同的废电池 回答者: 热心网友 | 2010-6-5 16:58
电池的危害:废弃在自然界电池中的汞会慢慢从电池中溢出来,进入土壤或水源,再通过农作物进入人体,损伤人的肾脏。在微生物的作用下,无机汞可以转化成甲基汞,聚集在鱼类的身体里,人食用了这种鱼后,甲基汞会进入人的大脑细胞,使人的神经系统受到严重破坏,重者会发疯致死。著名的日本水俣病就是甲基汞所致。镉渗出污染土地和水体,最终进入人体使人的肝和肾受损,也会引起骨质松软,重者造成骨骼变形。汽车废电池中含有酸和重金属铅泄漏到自然界可引起土壤和水源污染,最终对人造成危害。

回收废电池:使得电池的使用量随之剧增。废电池混在垃圾中,不仅污染环境,而且也是浪费。全国电池年消耗量为30亿只,因无回收而丢失铜740吨、锌1.6万吨、锰粉9.7万吨。我们应该把废旧电池与其它垃圾分开,集中起来送去回收。许多国家都很重视废电池的回收。德国的很多商店要求顾客在购买电池时,同时要把废旧电池交回给商店;日本专有分类箱收集不同的废电池 回答者: t555666789 | 一级 | 2010-6-5 17:08
有的人认为,废电池没什么大危害,随便乱扔,其实,废电池对环境的危害是非常大的。
科学调查表明,一颗钮扣电池弃入大自然后,可以污染60万升水,相当于一个人一生的用水量。而中国每年要消耗这样的电池70亿只……
这是多么惊人得数字啊!!废电池的其主要成分为锰、汞、锌、铬等重金属。废电池无论埋在大气中还是深埋在地下,其重金属成分都会随渗液溢出,造成地下水和土壤的污染,日积月累,会严重危害人类健康。 回答者: 热心网友 | 2010-6-6 14:43
危险非常大

有的人认为,废电池没什么大危害,随便乱扔,其实,废电池对环境的危害是非常大的。
科学调查表明,一颗钮扣电池弃入大自然后,可以污染60万升水,相当于一个人一生的用水量。而中国每年要消耗这样的电池70亿只……
这是多么惊人得数字啊!!废电池的其主要成分为锰、汞、锌、铬等重金属。废电池无论埋在大气中还是深埋在地下,其重金属成分都会随渗液溢出,造成地下水和土壤的污染,日积月累,会严重危害人类健康。
一、电池的组成:干电池、充电电池的组成成分:锌皮(铁皮)、碳棒、汞、硫酸化物、铜帽;蓄电池以铅的化合物为主。举例:1号废旧锌锰电池的组成,重量70克左右,其中碳棒5.2克,锌皮7.0克,锰粉25克,铜帽0.5克,其他32克。
二、废旧电池的危害性:废旧电池的危害主要集中在其中所含的少量的重金属上,如铅、汞、镉等。这些有毒物质通过各种途径进入人体内,长期积蓄难以排除,损害神经系统、造血功能和骨骼,甚至可以致癌。铅:神经系统(神经衰弱、手足麻木)、消化系统(消化不良、腹部绞痛)、血液中毒和其他的病变。汞:精神状态改变是汞中毒的一大症状。脉搏加快,肌肉颤动,口腔和消化系统病变。镉、锰:主要危害神经系统。三、废旧电池污染环境的途径:这些电池的组成物质在使用过程中,被封存在电池壳内部,并不会对环境造成影响。但经过长期机械磨损和腐蚀,使得内部的重金属和酸碱等泄露出来,进入土壤或水源,就会通过各种途径进入人的食物链。过程简述如下:池土壤微生物动物循环粉尘农作物食物人体神经沉积发病

其他水源植物食品消化生物从环境中摄取的重金属可以经过食物链的生物放大作用,逐级在较高级的生物中成千上万地富积,然后经过食物进入人的身体,在某些器官中积蓄造成慢性中毒。日本的水(人加吴)病就是汞中毒的典型案例。四、废旧电池危害的其它表现:目前世界上生活垃圾处理主要是卫生填埋、堆肥和焚烧三种方式,混入生活垃圾的废旧电池在这三个过程中的污染作用体现在:填埋:废旧电池的重金属通过渗滤作用污染水体和土壤。焚烧:废旧电池在高温下,腐蚀设备,某些重金属在焚烧炉中挥发在飞灰中,造成大气污染;焚烧炉底重金属堆积,给产生的灰渣造成污染。堆肥:废旧电池的重金属含量较高,造成堆肥的质量下降。再利用:一般采用反射炉火冶金法,工艺虽然容易掌握但是回收率只有82%,其余的铅以气体和粉尘的形态出现,同时冶炼过程中的二氧化硫会进入空气中,造成二次污染,直接危害操作工人的健康。所以不要扔废电池!

2888

阅读全文

与优美四六级英语文段相关的资料

热点内容
老公的家教老师女演员 浏览:788
圆明园题材电影有哪些 浏览:806
欧洲出轨类型的电影 浏览:587
看电影可以提前在网上买票么 浏览:288
有没有什么可以在b站看的电影 浏览:280
今晚他要去看电影吗?翻译英文。 浏览:951
林默烧衣服的那个电影叫什么 浏览:133
哈莉奎茵与小丑电影免费观看 浏览:509
维卡克里克斯演过哪些电影 浏览:961
什么算一下观看的网站 浏览:710
大地影院今日上映表 浏览:296
朱罗纪世界1免费观看 浏览:311
影院容纳量 浏览:746
韩国最大尺度电影 浏览:130
八百电影 浏览:844
手机影院排行榜在哪看 浏览:182
韩国有真做的电影么 浏览:237
欧美爱情电影网 浏览:515
一个女的去美国的电影 浏览:9
金希贞的妻子的朋友 浏览:610