Question

The concept of obtaining fresh water from icebergs that are moved to populated areas and barren regions of the world was once treated as a joke more appropriate to cartoons than real life. 1,especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.

Glaciers (冰河) 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,2 that it could maintain all the rivers of the world for 1 ,000 years. Floating on the oceans every year are 7 ,659 trillion metric tons of ice stored 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,3 ，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,4 Because they melt more slowly than smaller pieces of ice,icebergs have been known to drift as far north as 35degrees south of the equator in the Atlantic Ocean. To move them to parts of the world where they are needed would not be too difficult.

5,such as the prevention of rapid melting in warmer climates and the storing of fresh water in great volume. But even if the icebergs lost half of their volume in moving,the water they could provide would be far cheaper than that produced by removing salt from sea water.

   A. which is formed when the sea itself freezes

   B. Difficulties arise in other technical matters

   C. But now it is being considered quite seriously by many nations

   D. Icebergs are not too much influenced by the temperature.

   E. pulled by subsurface currents

   F. a reservoir (蓄水池) of untapped fresh water so large

   G. People often get fresh water by removing the salt from sea water.

 1.                  2.                  3.         4.          5.         

Answer 1

從冰山獲得淡水并運送到人口密集地區(qū)和貧瘠地區(qū)曾一度被認為是一個笑話，但是現(xiàn)在它正在被許多國家視為可以操作的現(xiàn)實問題。

1. C考查上下文的銜接和邏輯關聯(lián)。前文說這一概念曾是一個笑話，后文表明淡水供應跟不上人口增長，只得考慮其方法，前后明顯是對比

和轉折關系。

2. F這里是對前文"glacial ice"的注釋和說明：冰河是如此巨大的未被開發(fā)的"蓄水池"，且下文還有that引起的結果狀語從句："that it could maintain all the rivers of the world for   1.000 years."

3. A如上文是對冰川的注釋，這里是非限制性定語從句，對"sea ice"作出注釋和說明。

4. E冰川的移動，仿佛是被次表層洋流推動著。

5. B這里是對第一段的呼應和回歸。第一段說的是現(xiàn)在人們在考慮開發(fā)冰川，這里說到開發(fā)時可能會有的問題及與利用海水相比的優(yōu)勢。