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.
Since 1960, the lake’s population of fish has become more biologically fragile.
The amount of water that the lake loses to evaporation each year will increase over the next two decades.
There are multiple sources of water besides the Gray River that feed into Lake Mudfish.
The town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.
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Passage Five
The Northern Pike is a very bad fish. It is a big, hungry fish, and swallows little fish such as trout and perch. Many Northern Pikes live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike are a serious threat to the lake because they eat all the smaller fish. Soon, all other species of fish in the lake will be killed off. This is not healthy for the environment.
Experts are afraid that the Northern Pike will swim out of Lake Davis through many smaller rivers that feed into the lake. They could spread all over the country and damage many other water environments. If that happens, it would be too late to stop the Northern Pike.
For ten years, officials have been trying to remove the Northern Pike from Lake Davis. They haw. tried using nets, explosives and poisons. However, the Northern Pike population is still doing well in Lake Davis. Many people do not like the idea of using poison to kill the fish. They worry that the poi- sons are bad for humans who use the water. No trace of the poisons has ever been found in local wells, however.
Scientists are going to try the poison again. This time, they will drain the lake before they add the poison to the water. A public hearing will be held to talk about the problem.
52. Why are some people against the use of poisons to kill Northern Pike?
A. Fishermen will be poisoned too.
B. The poisons are expensive.
C. They think that wells will be polluted.
D. The lake will become unsafe.
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It is used by the residents of Toronto.
It is returned to a place deep in the lake.
It is cooled down before being used again.
It is added to the water inside air-conditioning systems.
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The chemicals they use sometimes pollute the water supply.
They often damage the buildings that they are trying to cool.
There are not enough CFCs in the world to cool all the buildings.
The method they use to cool water is thought to harm the ozone layer.
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It keeps buildings much cooler than other methods.
It can be used by large cities anywhere in the world.
It is much more energy-efficient than traditional systems.
It keeps water from being used for more than one purpose.
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Although a town reduces its public services in order to avoid a tax increase, the town’s tax rate exceeds that of other towns in the surrounding area.
Although a state.passes strict laws to limit the type of toxic material that can be disposed of in public landfills, illegal dumping continues to increase.
Although a town’s citizens reduce their individual use of water, the town’s water supplies continue to dwindle, because of a steady increase in the total populating of the town.
Although a country attempts to increase the sale of domestic goods by adding a tax to the price of imported goods, the sate of imported goods within the country continues to increase.
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what
who
that
whoever
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Enwave's system is said to work only in cities located near the Great Lakes.
The water deep in Lake Ontario always remains at the same temperature.
Experts warn that the use of CFCs in Enwave' s system will add to global warming.
Toronto is now searching for new natural sources of water to use in its water supply.
第23题:
They pump the air continuously to the units in each room.
They lower the temperature of the water in the system.
They help the water cool down naturally on the roof .
They gradually clean the water as it flows through the building.