题目内容
（请给出正确答案）
In China, some rivers are so polluted that fish can' t grow in them.
A．Y
B．N
C．NG
如果结果不匹配，请 联系老师 获取答案
更多“In China, some rivers are so p…”相关的问题
Water Warnings
Urgent Tasks for China
Water has long been considered an inexhaustible resource. But China is facing an unmistakable water crisis, and recently, because of increasingly hard-to-miss symptoms of the shortage, people in all parts of society are beginning to realize just how precious commodity water really is.
At first glance, it seems like there should be enough: China's total supply of freshwater resources ranks sixth in the world, after Brazil, Russia, Canada, the United States and Indonesia. But despite this apparent advantage, China's per capita water resources fall far below the world average of 7,600 cubic meters per-capita due to the country's enormous population size. China's per-capita amount of 2,200 cubic meters is expected to decrease further as the country continues its rapid economic growth and population expansion.
"Without excessively exploiting underground water, China has a water gap of nearly 40 billion cubic meters. The country's 320 million rural people aren't able to drink safe water and over 400 cities don't have sufficient water supply, 110 of which face a serious shortage," Wang Shucheng, Minister of Water Resources, said recently.
Some water resources experts warn that the current shortage is no more than a warning signal, with a greater crisis yet to come. The Ministry of Water Resources issued a water crisis warning as early as November 2001. At the time it said that when the Chinese population peaks at 1.6 billion in 2030, China's per-capita water resources could fall to 1,700 cubic meters, the internationally acknowledged level below which an area is said to be experiencing "water stress".
Poor Natural Conditions
Scant water resources to slake the thirsts of a population of 1.3 billion, and the uneven geographical distribution of these resources, form. the basis of water conditions in China.
Affected by monsoons (季候风), China's precipitation (降水量) varies considerably among different
seasons. The time of precipitation overlaps (交迭) with the hottest seasons, mostly in summer and autumn and scarcely in winter and spring. Generally, regions with the lowest precipitation levels receive it concentratedly only at certain times of the year, which easily gives rise to drought in spring and flooding in summer. Meanwhile, two thirds of China's water resources is comprised of runoff flooding, which means rivers often flood in the rainy season and dry up at other times.
China's water resources are also distributed geographically unevenly, inconsistent with the distribution of land, mineral resources and productivity. Generally, water resources are concentrated in the southern and eastern parts of the country, and in mountainous areas. Annual precipitation amounts vary from more than 3,000 millimeters in the southeast to less than 50 millimeters in the northwest.
China is prone to floods and droughts, such-as the severe drought that hit Chongqing and Sichuan in southwest China this summer, the country's worst in 50 years. While per capita water resources in some areas of the north approach the level of the driest countries in the world, the water-rich south often suffers from seasonal droughts, which adversely affects rice, the major crop reliant on watering, as well as other cash crops. The last two decades have seen a nominal change in the country's surface water resources and total water resources. Yet clue to factors such as global climate change and river drainage, and total water resources in south China are rising while water resources in the north are falling significantly.
A Series of Measures Adopted by Chinese Government
Against these difficult conditions, the Chinese Government has taken a series of measures to try and guarantee the basic water demands necessary for daily life and social and economic development. Since the founding of t
A．Y
B．N
C．NG
A．The ice was cut and handled with the help of some special tools.
B．The ice was taken from the flowing river with hooks and carried by sleds to icehouses.
C．The ice was carried on the frozen, surface of the pond or river.
D．The ice was sawed into even blocks by workers.
Water Problems
Where' s the water？
Water. If you've got it, you probably take it for granted. But a quick look at the globe -- and a chat with the tiny group of researchers who are worrying about fresh water --- both indicate that water shortages are very serious.
And they aren't necessarily in the future, either. Here' s what we' ve read in the past week or so.
... Mexico City (home to 20 million people) is sinking because the city sucks out underground water faster than the aquifer can be refilled.
... Florida wants to refill its overpumped aquifer (蓄水层) with untreated surface water, despite federal regulations to the contrary.
... Texas is moving toward private, for-profit water sales. The water will be "mined" from aquifers that are disappearing fast. No word on what the private suppliers, including corporate raider T. Boone Pickens, will do once the aquifers run dry.
... Aquifers around the world are being overtapped for irrigated agriculture, which fills about 40 percent of the global larder.
... The Bush Administration has withdrawn a proposed tightening of the arsenic standard for drinking water. Critics say the old rule, dating to 1942, could allow thousands of cases of cancer and other diseases. Meanwhile, in Bangladesh, what' s been called the "largest poisoning of a population in history" has 35 to 77 million people drinking arsenic-laced water.
... A showdown is looming over the Tigris(底格里斯河) and Euphrates Rivers （幼发拉底河）, which originate in Turkey, theft water both Syria and Iraq. If Turkey goes 'ahead with a series of dams, the downriver nations could starve.
You don' t miss your water, an old blues sage wisely said, until your well runs dry. Down here on planet Earth, the well is starting to run dry. We've seen projections that three billion people --half of today's population -- will be short of water in 2025.
Places short of water
Seen from a global water map, water is shortest in equatorial countries, often where populations are rising. Here are some examples of countries facing water shortage problem.
China, with 1.26 billion people, is "the one area worrying most people most of the time," says Marq de: Villiers, author of the recently published "Water ". In dry Northern China, he says, "the water tame is dropping one meter per year due to overpumping, and the Chinese admit that 300 cities are running short. They are diverting water from agriculture and farmers are going out of business." Some Chinese rivers are so polluted with heavy metals that they can' t be used for irrigation, he adds.
"They' re disgraceful, unusable, industrial sewers," says de Villiers. As farmers go out of business, China will have to import more food.
In India, home to 1.002 billion people, key aquifers are being overpumped, and the soil is growing saltier through contamination with irrigation water. Irrigation was a key to increasing food production in India during the green revolution, and as the population surges toward a projected 1.363 billion in 2025, its crops will continue to depend on clean water and clean soil.
Israel (population 6.2 million), invented many water-conserving technologies, but water withdrawals still exceed resupply. Overpumping of aquifers along the coast is allowing seawater to pollute drinking water. Like neighboring Jordan, Israel is largely dependent on the Jordan River for fresh water.
Water Fight
Egypt, whose population of 68 million may reach 97 million by 2025, gets essentially no rainfall. All agriculture is irrigated by seasonal floods from the Nile River, and from water stored behind the Aswan High Dam. Any interference with water flow by Sudan or Ethiopia could starve Egypt.
"The Nile is one I worry about," says Sandra Poste
A．Y
B．N
C．NG
M: There is the Yukon in Alaska，and also the Colorado River．They are 3,168 kilometers and 2,186 kilometers respectively．
Q: What do we learn from the conversation？
(13)
A．Mississippi River is 6,040 kilometers.
B．Yukon River is 3,186 kilometers.
C．Alaska River is 3,168 kilometers.
D．Colorado River is 2,186 kilometers.
A high negative ion count is likely to be found ______.
A．near a pond with a water pump
B．close to a slowly flowing river
C．high on some barren mountains
D．near a fountain
A high negative inn count is likely to be found ______.
A．near a pond with a water pump
B．close to a slow-flowing river
C．high in some barren mountains
D．by a rotation water sprinkler
China has sent several pandas to some foreign governments as gifts.
A．Y
B．N
C．NG
听力原文： The ordinary raindrop is a mighty earthmover with sufficient strength to cut rock. When rainwater collects on the surface of the ground, some of it evaporates and some of it sinks into the earth. The remainder begins to flow downhill, commencing its lengthy journey from brook to stream to lake, or to a river that will carry it to the sea.
As water flows along the ground, it picks up sand, pebbles, even boulders. It uses them to gnaw at the sides and bottoms of its channel, gradually loosening more earth.
By this process enormous amounts of mud and rock are moved from the land to the sea. Each year the Mississippi River carries 730 million tons of solid matter into the Gulf of Mexico.
This constant hauling of land into the sea is lowering the United States' average height above sea level at a rate of about one foot every 9,000 years. If erosion continues at the same rate, the United States will be worn completely down to sea level in about 23 million years.
What does erosion by water result in？
(30)
A．Wearing down the soil.
B．Building up land.
C．Enriching the soil.
D．Loosening more earth.
