公共英語五級(jí)閱讀文章《從冰山獲取淡水資源》
我們知道人類的生存發(fā)展離不開淡水資源，但是淡水資源是有限的，現(xiàn)在有人提議可以從冰山中得到淡水資源，你認(rèn)為呢?下面，我們一起來看這篇公共英語五級(jí)閱讀文章。
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 10,000 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.
附：公共英語五級(jí)的閱讀技巧
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回答這類問題時(shí)，往往需要利用常識(shí)、經(jīng)驗(yàn)及文章中的觀點(diǎn)和內(nèi)容進(jìn)行邏輯推理。關(guān)聯(lián)詞、帶有感情色彩的形容詞或副詞常常是一些有助于考生進(jìn)行推理的語境線索。
(3)目的.問題與主題問題關(guān)系密切。但應(yīng)試時(shí)，回答目的類問題的難度更大一些。原因在于考生必須選取一個(gè)通常在文章中找不到的答案。
作者的寫作目的多種多樣，常見的有提供信息、描述事件、陳述問題、講述故事、進(jìn)行規(guī)勸等。
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