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 Th

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 ofgetting fresh water from icebergs that are moved to populated areas or placeswas once treated as a joke．Recently, scientists have warned that the human race will outgrowits fresh water supply faster than it runs out of food．1.

Glaciers are apossible source of fresh water that has been overlooked until recently． 2.It contains fresh water so much that it could sustain all the riversof the world for 1,000 years．

Huge glaciersthat stretch over the shallow continental shelf give birth to icebergsthroughout the year． 3.However, theyare formed entirely on land, breaking off when glaciers spread over the sea．As they drift away from thepolar region, icebergs sometimes move mysteriously in a direction opposite tothe wind．Becausethey melt more slowly than smaller pieces of ice, icebergs have been known todrift as far north as 35 degrees south of the equator in the Atlantic Ocean． 4.The difficulty exists such as its rapid melting in warmer climates．5.

       A．Icebergs are not like sea ice, which is formed whenthe sea itself freezes．

       B．Now it is being considered quite serious by manynations．

       C．7,659 trillion metric tons of ice are floating onthe sea every year．

       D．But the water they could provide would be farcheaper than that produced．

       E．To move them to try parts of the world would notbe too difficult．

       F．It is not a dream to get water from Icebergs．

       G．Three-quarters of the Earth’s fresh water supplyis still tied up in glacial ice．

试题答案

【答案】

1.B

2.G

3.A

4.E

5.D