根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Obtaining Fresh Water from Icebergs
The idea of getting fresh water from icebergs that are moved to populated areas or places was once treated as a joke. Recently, scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food. 【小题1】
Glaciers are a possible source of fresh water that has been overlooked until recently. 【小题2】 It contains fresh water so much that it could sustain(维持) all the rivers of the world for 1,000 years. Huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year. 【小题3】 However, 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. 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(赤道) in the Atlantic Ocean. 【小题4】 The difficulty exists such as its rapid melting in warmer climates. 【小题5】 A．Icebergs are not like sea ice, which is formed when the sea itself freezes.B．Now it is being considered quite serious by many nations.C．7,659 trillion metric tons of ice are floating on the sea every year.D．But the water they could provide would be far cheaper than that produced.E. To move them to dry parts of the world would not be too difficult.
F. It is not a dream to get water from icebergs.
G. Three-quarters of the Earth’s fresh water supply is still tied up in glacial ice.B
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(答案→)B
解析：
【小题1】根据Recently, scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.可知这里想说最近，科学家提醒人类淡水资源的供给的快速增长将会比用完食物的速度要快。故选B。
【小题2】根据Glaciers are a possible source of fresh water that has been overlooked until recently. 72 It contains fresh water so much that it could sustain(维持) all the rivers of the world for 1,000 years.可知这里想说地球上四分之三的淡水资源依然靠冰川。故选G。
【小题3】根据However, they are formed entirely on land, breaking off when glaciers spread over the sea.可知这里想说冰山不像海冰，它是在海水结冰时形成的。故选A。
【小题4】根据As they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind. 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(赤道) in the Atlantic Ocean.可知这里想说把它们移到世界干旱的地方，不会太困难。故选E。
【小题5】根据The difficulty exists such as its rapid melting in warmer climates.可知这里想说但是他们提供的水将比它们所能生产的水更便宜。故选D。