网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
灌溉水源（water sources for irrigation）
参考答案
更多 “灌溉水源（water sources for irrigation）” 相关考题
考题
The overwhelming flood has polluted the water sources of the city and it is now ____ drinkable water.
A、in needB、in shortC、short ofD、needed
考题
EThe need to feed a growing population is putting much pressure on the world’s supply of water. With 97% of the world’s water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture. Although the idea of a water shortage（短缺）seems strange to someone fortunate enough to live in a high rainfull country, many of the world’s agricultural industries experience constant water shortages.Although dams can be built to store water for agricultural use in dry areas and dry seaons, the costs of water redistribution(重新分配)are very high. Notonly is there the cost of the engineering itself, but there is also an environmental cost to be considered. Where valleys(山谷)are flooded to create dams, houses are lost and wildlife homes destroyed. Besides, water many flow easily through pipes to fields,but it cannot be transported from one side of the world to the other. Each country must therefore rely on the management of its own water to supply its farming requirements.This is particularly troubling ro countries with agricultural industries in areas dependent on irrigation（灌溉）. In Texas, farmers’ overuse of irrigation water be resulted in a 25% redcution of the water stores. In the Central Valley area of south eastern USA, a huge water engineering project provided water for farming in dry vallege, but much of the water use has been poorly managed.Saudi Arabia’s attempts to grow wheat in desert areas have been the pumping of huge quantities of irrigation water from underground reserves. Because there is no rainfall in these areas, such reserves can only decrease, and it is believed that fifty years of pumping will see them run dry.72. From the first two paragraphs we learnt that _______.A.much of the world’s water is available for useB.people in high rainfll countries feel luckyC.the costs of water redistribution should be consideredD.water can be easily carried through pipes across the world
考题
For decades，farmers and environmentalists in California have been entangled in a______over laws that limit the amount of water diverted from rivers and streams for irrigation。
A.dispute
B.register
C.conflict
D.negotiation
考题
单选题Since 1960, the fast-growing town of Hotstone, Arizona, has drawn water from the Gray River, which feeds Lake Mudfish. If the town’s water use continues to grow at its present rate, in about 20 years the water level of Lake Mudfish will inevitably decrease to the point that it can no longer support its biologically fragile population of fish. The prediction above is based on which of the following assumptions?A
As the town’s water requirements grow, it will not be able to meet those requirements by drawing on water sources other than the Gray River.B
Since 1960, the lake’s population of fish has become more biologically fragile.C
The amount of water that the lake loses to evaporation each year will increase over the next two decades.D
There are multiple sources of water besides the Gray River that feed into Lake Mudfish.E
The town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.
考题
单选题According to the passage, which of the following should be considered sources of renewable energy?A
Petroleum, sunlight and wind power.B
Gas, water and fossil fuels.C
Coal, natural gas and hydropower.D
Sunlight, water and wind power.
考题
单选题Large quantities of water ______ for irrigation.A
is neededB
has neededC
are neededD
need
考题
单选题The author says that in some hot and dry areas it is advisable to _____.A
build big lakes to store waterB
construct big pumping stationsC
channel water from nearby rivers to croplandD
build small and cheap irrigation systems
热门标签
最新试卷