水是一切有机体的主要组成部分,全球动植物和40亿人体内含有约11200亿吨水。人类社会依赖水而生存发展。古代,人类对水取利避害,适应水而生存;近代,人类对水兴利除害,兴建工程,开发水利,控制水害;现代,随着社会和生产的发展,地球上可资利用的水日趋短缺,水体受到污染,严重影响人类生存的环境,人类逐渐认识到水是一种重要资源和环境因素,从而在更高的水平上开始对水开展了新的兴利避害活动。
世界气象组织1996年初指出:缺水是全世界城市面临的首要问题,估计到2050年,世界2/3以上的人口将生活在城市,而全球有46%的城市人口缺水,必须平衡社会经济发展和城市淡水供应管理二者之间的关系,进行水资源的储存、输送和管理的大规模工程建设。
相关文章:
the importance of water(一
水的重要性(一)
the importance of water(一)
it is well-known that water is indispensable in existing, in producing and in living. and we should
not waste of a drop of water.
众所周知,在生产和生活中水是必不可少的。我们不应该浪费一滴水。
first, water is definitely important for life. as is known to us all, water is necessary to sup
port life. without water, human beings, animals and plants cannot exist at all.
首先,水对生命是非常重要的。众所周知,水是维持生命所必需的。没有水,人类,动物和植物都不复存在。 second, water is also significant for producing. for one thing, industrial production needs a lot of water, such as using water to generate electricity. for another, agricultural production is also in need of water, especially in irrigation.
as we know , water is very important to man, we can’t live without water. the amount of water which is suitable to drink is less and less. but some people don’t care about it .they waste a lot of water in their daily life. even worse, they pour dirty water in to rivers. they throw rubbish into rivers , too. many rivers and lakes are seriously polluted.something must be done to stop the pollution. only in this way can we live happily. if we don’t save water, the last drop of water will be a tear-drop of us.
we know that despite the fact that seventy percent of the earth's surface is covered with water, only a little part of it is fresh water. yet the demand for fresh water in our daily life and in industry seems great. moreover, with the expansion of the population and development of industry, the amount of the fresh water needed will increase even rapidly. it is estimated that if such a trend continues, the fresh water on earth will be exhausted very soon. what is worse, more and more water resources are being polluted, making the water unfit to use.
in addition,we must warn the people of the importance of water and the danger we are facing.for example, in most asian societies where rice is the staple food, the water used after cleaning rice contains various nutrients for plant growth and is an excellent detergent to flush the toilet. furthermore, the intriguing idea of converting the inexhaustible sea water to fresh water supplies will be the ultimate solution.
因为航天飞机跟火箭不一样,能去能回,所以他非常自豪。
(1) 小方很高兴,因为她这次得了第一名。
(2) 小爱感到十分遗憾,因为她不能参加这次歌咏比赛。
(3) 文艺会推迟到下个月举行,因为新剧院还未装修好。
(4) 洁白的雪其实不能吃,因为雪中有许多尘埃。
游戏开始了,第一组是张生德猜、涂言超演。张生德集中注意力努力猜着,当猜到第二个词时,他一下子愣住了,着急地捏紧了拳头,旁边的同学急得大叫,特别是方哲,不假思索地说出了答案,又马上捂住了自己的嘴巴——也许他觉得有点不好意思了吧!
最有意思的一组是我和陈思瑜了。我们俩推来挡去,都不愿意去猜词,结果还是我上去了。开始很顺利,连着猜准了好几个,可到了后来我却愣住了,因为我不懂陈思瑜在说什么、装什么,急得涨红了脸。同学们指手画脚地围着我转,方哲更是急得像小猴子似地上蹿下跳。
当黑板上出现了“跑鞋”时,陈思瑜抓耳挠腮不知道该怎么表达,就不小心说出了一个“跑”字,被判犯规,我们俩只好垂头丧气地败下阵来。
散落在地的苹果被人们捡了起来。
(1) 老师把陈红同学送回了家。
(2) 罗盛教把崔莹救出来了。
(3) 春风把大江南北染得一片碧绿。
© 2022 xuexicn.net,All Rights Reserved.