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发布时间:2012-07-28 关键词:托福写作文章欣赏(15)
摘要:托福写作文章欣赏(15)
北京新航道致力于为考生提供托福考试的相关讯息。写作是考生的难题。词汇量有了,但是不知道怎么去表达,常常流水账似的文章。其实,写作并不是那么简单的按照语法来造句。首先要明确自己要写什么,其次要分配好文章的架构,然后才理顺思路,最后来遣词造句填内容,还要考虑语法、词汇等问题。所以说拿个写作不是那么容易的事情。那么,怎么样写出一篇好文章来?北京新航道带着大家去看看那些好的文章是怎么做到的。帮助大家积累一些经验技巧为己所用。
Obtaining Fresh water from icebergs
The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life. But now it is being considered quite seriously by many nations, especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.
Glaciers are a possible source of fresh water that has been overlooked until recently. Three-quarters of the Earth's fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all the rivers of the world for 1,000 years. Floating on the oceans every year are 7,659 trillion metric tons of ice encased in 10000 icebergs that break away from the polar ice caps, more than ninety percent of them from Antarctica.
Huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year. Icebergs are not like sea ice, which is formed when the sea itself freezes, rather, they are formed entirely on land, breaking off when glaciers spread over the sea. As they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind, pulled by subsurface currents. Because they melt more slowly than smaller pieces of ice, icebergs have been known to drift as far north as 35 degrees south of the equator in the Atlantic Ocean. To corral them and steer them to parts of the world where they are needed would not be too difficult.
The difficulty arises in other technical matters, such as the prevention of rapid melting in warmer climates and the funneling of fresh water to shore in great volume. But even if the icebergs lost half of their volume in towing, the water they could provide would be far cheaper than that produced by desalinization, or removing salt from water.
上面是一篇的托福写作文章。考生可以看看,分析一下别人是怎么写的,然后运用到自己的文章中来。多看,多想,多练,相信大家都能成为写作能手的。
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