水,这种地球上的基本物资是多么的值得我们赞美啊!是她,孕育了大千世界,芸芸世生;是她,为生命提供能量,让生命能够存活;还是她,使生命继续发展,越来越兴旺,越来越发达。所以说,"水,是生命之源"毫不夸张。但,水是取舍不尽,用之不竭的吗?我们可以肯定的回答:不是的。虽然地球70、80%的面积被水覆盖,但97.55%的水是海水,既不能直接饮用也不能灌溉。在余下的2.5%的淡水中,人类真正能利用的水还不到世界淡水总量的1%。
从以上数据可以看出地球上可供饮用的水资源并不多。在中东所有资源中,最容易引起危机的是水,中东的水比石油贵。在我们中国水资源也十分匮乏。西部地区有许多地方,每人只有一杯水可供使用。
你们看到这些数字,是不是很惊讶!是啊,节约水资源迫在眉睫。那么,我来教给大家一些在日常生活中节约用水的方法:淘米的水可以用来浇花或浇草;洗衣服的水可以用来冲马桶;洗脸的水可以用来洗脚;洗头的水可以用来冲自行车……
我们在刷盘子的时候,要把水龙头拧小一点儿,刷完以后要把水龙头拧紧。
我相信大家也有一些节约用水的方法,我听大人们说,水资源还可以循环利用,比如:将排放的生活用水净化后可以浇灌城市道路两旁的花和树,还可以冲洗车辆等。
节约水资源,靠大家一起努力。
昨天,我跟妈妈去她单位玩,看见一位叔叔正拿着大毛笔,挥洒自如地在水池旁写了“请节约用水“五个大字,随后,那位叔叔将水龙头开到最大开始洗笔。洗着洗着,水就淹没了池子,像发大水一样,向四面八方流去,,叔叔还是视而不见,仍然我行我素。他为了不让水溅到自己的身上,躲得远远的。
水依然在“哗哗”地流着,仿佛在悲哀地说:“唉,有些人真的不知道我们的可贵之处,也不知道我们的贡献有多大,如果植物没有了水,它们就会渴,要知道我国的淡水资源日益紧张。“唉”,我听到后叹了一口气,想:那位叔叔自己写下了几个大字“请节约用水”,可他自己却在浪费水资源,他说的和做的一点都不一致啊!于是我走过去,诚恳地对叔叔说:“叔叔,水是生命之源,你不节约用水,等到水枯竭的那天,后悔就来不及了,植物会全渴,人类就会不复存在,水对人类是何其珍贵啊!”
叔叔听了我的话,先愣了一下,吃惊地看看我,脸红到了耳朵根,说:“了不起,你真是我的‘小老师’。”然后迅速地关上了水龙头。
经历了这样的事,我决定从自身做起,爱惜水资源:
1、可以把洗过菜的水用来浇花、浇菜。
2、及进关紧未关好的水龙头。
3、把家中抽水马桶的水量调小。
我相信全人类如果每人都能节约一点水,地球妈妈会笑得更灿烂,万物会更加生机勃勃。
(1 模版1
Different people have different views on_____.Some people think that_____,whereas others aegue that __________.
As far as I am concerned, I agree with the opinion that ___________.For one thing,I firmly believe that ___________.For another,_____________.Just think of________,who/which_______.
Taking all these factors into consideration,we may safely come to the conclusion that______.Only if_______can we _______,just as the saying goes,________________.
(2模版2
In recent years there have been many reports of ________.It turns a new chapter of _________in China,and will have far-reaching effects in the forthcoming years.
The biggest benefit,in my eyes,is that_______.In addition,_______.Finally,______________.
Apart from the benefits mentioned above,we should also face several unavoidable challenges.In the first place,_____________.In the second place,________.What’s more,_______________.In summary,we should_______________.
(3模版3
Nowadays more and more ______are commonly and widely used in everyday life,ranging from __________to_____________.
The popularity of _______will have a great influence on ______.On the one hand,_________.On the other hand,__________.
To conclude,____________are just like a double-edged sword.With them we may________.However,one point should be kept in mind that we should make sensible use,always being a master instead of slaving of them.
yesterday i read a book the name of the book is《dr bethune》.
dr bethune was a famous doctor from canada. in 1938 he came to china. at that time china was at war with japan. he worked as a doctor in the chinese army and saved many soldiers’ lives. he worked very hard and became sick. dr bethune died in 1939. he was only 49 years old. he was a good man and we remember him today.
i think the book is very very good!
written by wu qingxiang
mar. 31
how to do research
——reading after a science paper
these days i am busy preparing my dissertation which is about web usage mining . i read some english papers and learnt much from them . and now i want to say something about a paper titled “web usage mining:discovery and applications of usage patterns from web data”.
this is the first english paper i read about dissertation and gave me great help .
this paper is a review about web usage mining. it introduced web usage mining in detail . although it is a little old for it was published in its contents are very useful today . it is organized according to the sequence of web usage mining and the six main parts are introduction which tells me what is web usage mining the sources and abstraction of web data the three steps of web usage mining taxonomy and project survey websift overview privacy issues . the third and fourth parts are most important . it had a list of existing project about web usage mining which i saw many times in other papers but this paper is the one creating this list . besides it has been referred for more then twenty times . as we all know that the higher the referred number is the more important the paper is so i consider this paper to be an important and successful one in this region.
in my opinion the success of this paper dues to three reasons . the first reason is the profound computer knowledge owned by the authors . web usage mining relates to many subjects such as artificial intelligence ontology semantic analysis but the most basic knowledge is computer science . the four authors are all professors of department of computer science and engineering in university of minnesota . for myself i am not major in computer science and i am not very good at computers so i feel a little difficult to understand technologies used in this region.
second they had read a large number of papers before they wrote this paper . there are fifty nine references listed after main contents . “stand on the shoulders of giants” this sentence tell us a truth : one can never successful all by oneself . and what’s more learn from others can save a lot of time and energy especially for us new learner . how to learn from others is a skill all of us should master but learning doesn’t mean copy or plagiary . other people’s knowledge and production is just our foundation upon this foundation we must have our own thoughts and creation. there are many remarks in this paper where referred other’s production.
third the authors had the experience of developing a web usage mining project . they don’t just engage in idle theorizing so their comprehension on this issue is greatly profound. they know what we may meet in a real project development and they know how to resolve them . after reading this paper i also read some other papers written in chinese . some of them are not based on real project and can not give useful resolution . websift is the name of system they developed which can be used to data mining and analysis .
i wrote this article not only because it gave me much help in preparing my dissertation but also because it tells me how to study and how to do research . honesty and preciseness are two essential making a researcher must have . hard-working is the necessary condition leading to success . this is just the beginning of my dissertation i should learn from these four authors both their knowledge and their attitude to study.
水是生命之源,人类的健康离不开水,人可以几天不进食,但是不可以几天不喝水。
你们知道吗?世界水日是哪一天?是每年的3月22日,为什么会有这个节日,是因为世界上能饮用的水资源正在慢慢的减少。而且水是一切生命赖以生存,社会经济发展不可缺少和不可替代的重要自然资源和环境要素。但是现在随着世界人口的增长,工农业生产污染和城市的发展,对有限的水资源及水的生存环境产生了巨大的影响。在全球的范围内,水质的污染、需水量的迅速增加和人们对水的不合理应用,使水资源进一步短缺。
为了唤起人们对保护水资源的意识,建立一种更为全面的,可持续利用的水资源。1993年1月18日,第47届联合国会议根据联合国环境与发展大会制定的《21世纪行动议程》中提出的建议,确定自1993年起,把每年的3月22日定为世界水日。
其实水质的问题在我们的生活中十分常见,举一个例子:我家住在下沙天元公寓,家门口以前是一条富有生机的小河,通往钱塘江。但是自从人们搬进了这片开发区,就无节制的向小河里乱扔垃圾、排放污水。小河不再是以前的小河了,它变得黑了,而且还有一种气味。这就是人们污染水资源的证据。如果我们不曾污染它,现在依旧可以在小河里嬉戏……但现在一切都变得不可能了。
节约如同燕衔泥,浪费就像河决堤。节约点点滴滴的水是我们点点滴滴的责任。同学们,保护水资源,让我们一起行动吧!我的演讲结束了,谢谢大家!
水是生命的源泉!水的用处可大了,刷牙、洗脸需要水,洗衣、做饭需要水,养花、种树需要水,灌溉农田需要水……总之,水给我们的生活带来了不少的方便。
世界上的淡水资源是有限的。我们乐清就是个缺水的地方,如果长时间不下雨,这里就会干旱,生活用水也难以保证。有一次,我们家停水了。早晨,我拿起水杯,打开水龙头,咦?怎么没水了?我奇怪了。我去问妈妈,才知道停水了。停水了,牙当然不能刷了。我一个上午都没喝水,到了中午,我渴得受不了了,妈妈叫我去买两瓶矿泉水。我带了两块钱下楼,没想到矿泉水要一块五一瓶。我又得回家再拿一块钱下楼,终于买了两瓶矿泉水回家,唉,可真麻烦!
尽管这样,有些人却不珍惜水。在学校里,我就看见有些同学浪费水。有一天,我来到盥洗室里接水,只见一个同学拿着一个瓶子,瓶盖上有一个小洞眼。他接了满满一瓶水,捏住塑料瓶往别人身上射水,我们制止他,他却不听。这样,他一直玩到上课才回到教室。看到这种浪费水的现象,我真气愤。
水是万物之源。如果没有了水,土地会干裂;如果没有了水,花、草、树木将会枯萎;如果没有了水,人类将会渴;如果没有了水,就看不到这个美丽可爱的世界。
水看似很普通,但万物都离不开水。假如世界上的水用完了,那我们的眼泪将会成为人们争夺的最后一滴水。保护水资源,是每一个地球公民的责任。
在正文下面的一、二行处,从信纸的中间偏右处开始,第一个词开头要大写,句末用逗号。不同的对象,结束语的写法也不同。
(1写给家人、亲戚,用your loving grandfather,lovingly yours,lovingly等;
(2写给熟人、朋友,用yours cordially,yours affectionately等;
(3写业务信函用truely yours(yours truely,faithfully yours(yours faithfully等;
(4对上级、长辈用yours obediently(obediently yours,yours respectfully(respectfully yours等。
在我们的地球上有许多的资源在慢慢的逐渐减少,特别是土和水的资源。
工业的发展,在生产过程当中大量排出的废水、废气、废渣等物质通过大气、水、固体废渣的形式进入土壤;同时,耕地被人为施化肥、农药并进行污水灌溉,是大量的有害物质进入并在其中积累,从而造成土壤的污染,不再适合耕作。每形成1厘米厚表土需要100年到400年的时间;即使在人为参与、管理极好的情况下,也需要20年。全世界每年有500万公顷的土地不再适合耕作。德国、日本、硬度以及我国的人均耕地减少了一半以上。由于滥伐森林,滥垦草地,英气土壤破坏和土地流失,世界耕地表土地流失约为270亿吨一年。
与空气一样,地球上的水似乎是取之不尽的,用之不竭的。而只有淡水中的一小部分被人所实际利用。如果把全球的水看成一缸,淡水只有一汤勺,而能够被人利用的淡水只有一滴。当世界上10亿人空时,拥有水资源900亿立方米;到21世纪中期,世界人口达90多亿时,全人类也能分享在规模相当的水资源,而且水资源正在被人污染,工业服了、农药、生活行水都流向河流和浅层水。1立方米污水将造成8至10立方米的水无法使用。
看吧!现在的土和水资源真是太少了,我们应该极力节约资源。让我们共同向一个目标点——节约资源努力吧!
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