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发布时间:2023-10-14 07:05:12

[简答题]Text C 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 have 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 li
A. A.The movement of glaciers
B.Icebergs as a source of fresh water
C.Future water shortages
D.The future of the world’s rivers

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[简答题]Text C 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 have 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 li
A. A.an iceberg that is towed
B.obtaining fresh water from icebergs
C.the population of arid areas
D.real life

[单项选择]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 10000 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
A. The movement of glaciers.
B. Icebergs as a source of water.
C. Future water shortages.
D. The future of the world’s rivers.
[填空题]Where does the fresh water come from
It comes from rivers, lakes and ().
[单项选择]Passage 6
Even in fresh water sharks hunt and kill. The Thresher shark, capable of lifting a small boat out of the water, has been sighted a mile inland on the Fowey River in Corn-wall. Killer sharks swim rivers to reach Lake Nicaragua in Central America; they average one human victim each year.
Sewage and garbage attract sharks inland. When floods carry garbage to the rivers they provide a rich diet which sometimes stimulates an epidemic of shark attacks. Warm water generally provides shark food, and a rich diet inflames the shark’s aggression.
In British waters sharks usually swim peacefully between ten and twenty miles off- shore where warm water currents fatten mackerel and pilchards for their food. But the shark is terrifyingly unpredictable. One seaman was severely mauled as far north as Wick in Scotland. Small boats have been att
A. salt water
B. fresh water
C. warm water
D. deep water
[填空题]What percentage does the fresh water account for
Only () percent.
[单项选择]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 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 Antarctic
A. How much fresh water is tied up in glacial ice 75 % of the Earth’s fresh water supply.B. 90% of the Earth’s fresh water supply.C. Enough to support human beings for 1,000 years.D. As much as the water from 10,000 trillion metric tons of ic
[填空题]One solution to fresh water shortage is to to use drip irrigation.
[填空题]Why people can’t use all of the fresh water
Because some of it is().

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