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  3. The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once trea

The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once trea

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问题     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【C1】________quite seriously by many nations, especially since scientists have warned that the human race will【C2】________its fresh water supply faster than it runs out of food.
    Glaciers are a possible【C3】________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【C4】________fresh water so immense that it could【C5】________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【C6】________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【C7】________ 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【C8】________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 control them and【C9】________them to parts of the world where they are needed would not be too difficult. 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 (脱盐), or【C10】________salt from water.
    A) removing  E) untapped  I) approximately  M) ensured
    B) stretch   F) resource  J) considered     N) sustain
    C) deriving  G) outgrow   K) similar        O) steer
    D) entirely  H) opposite  L) source
【C5】
选项
答案N
解析 此处需要及物动词原形作谓语。词库中符合条件的动词有stretch，sustain和steer，而根据前面的so immense可知此句意为“冰川的水量极大，足以维持地球上所有河流”，因此sustain符合句意，
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