题目内容
（请给出正确答案）
The supply of groundwater is getting low because of ______.
A．conservation
B．toxic waste
C．pollution
D．population increase
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更多“The supply of groundwater is g…”相关的问题
A．clear ground units.ready to pushback（tow off）aircraft, please.
B．clear air （power） supply unit.
C．brakes released. pushback（tow off）
D．chocks inserted.landing gear safety pins inserted,ground power unit on,release brakes, please
A．the Romans could build them more cheaply
B．these channels could follow uneven ground more easily
C．the Romans could not build large pipes
D．these channels avoided rapid changes of pressure
The resaults are more serious: for where there are trees their roots break the soil allowing the rain to sink and also hold the soil, thus preventing it from being washed away easily, but where there are no trees, the soil becomes hard and poor.
The rain falls on hard ground and flows away on the surface, causing floods, and carry away with it the rich top soil in which crops grow so well. When all the top soil is gone, nothing remains but worthless desert.
The purpose that the writer wrote this article for is ______.
A．to tell people that trees are very useful to man
B．to warn people not to cut down trees any more
C．to warn that man mustn't destroy forests any more
D．to explain how trees help to prevent drought and floods
根据材料请回答 41～45 题
Public Health in Rome
The Romans built great "aqueducts" to carry fresh water from the mountains to the cities.Many of these aqueducts are still standing today.The Romans also built great pipes under the ground to carry away the sewage(污水).In Rome, these sewage pipes (sewers)are still used today; it is 2,000 years old.The Roman Emperors even set up a government health service.They built the first great public hospitals in Europe, and they paid doctors to look after poor people.When the Roman Empire fell to pieces, these civilized methods of treatment disappeared from most of Europe, for more than a thousand years.People went back to the old ways.They lived in dirty conditions which helped to cause diseases; and they asked God to cure the diseases.They shut up mentally sick people in prisons.Or they burnt them alive because they were supposed to have magic power.And the work of the Greek and Roman doctors was lost.
Over a thousand years ago, the Arabs moved into many of the Mediterranean coun-tries.They took big parts of the old Roman lands.They translated the Greek and Roman medical books into Arabic.Arab, doctors themselves made many new discoveries.When civilization at last came back to Europe, men once again translated the Greek and Roman works on medicine into Latin.Slowly European doctors discovered again the things that the Greeks and Romans had known so long ago.They found out more about the way the body works, the way our blood goes round our bodies, the way our nerves send messages from our brains to our muscles, the way these muscles move our bodies.
第 41 题 The word "aqueduct" probably means__________
A．something which was built long ago.
B．something invented by a Roman Emperor.
C．a big pipe under the ground,
D．something built to supply clean water for the citizens.
Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire (帝国). It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home country found itself threatened by flood and starvation.
Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. So, unless the government has a good system of control, or can educate the people, the forests will slowly disappear.
This does not only mean that the villagers' children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up, allowing the rain to sink in, and also bind the soil, thus preventing its being washed a-way easily. But where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
What is the most important function of trees？
A．Providing fuel.
B．Offering shade.
C．Preventing natural disaster.
D．Providing wood.
听力原文： Shanghai plans to build a vast underground network of malls, restaurants and parking lots to make up for a lack of space above the ground, according to a recent government report. The development will cover 600,000 square meters, the equivalent of 120 soccer fields, spread across four underground floors, the city government reported on its website. The city is accepting bids from builders. Shanghai has about 20 million people, plus factories, office towers, and high-rise apartments, crowded into a small triangular territory near the mouth of Yangtze River. The plans call for the project, due to be finished by 2006, to expand existing facilities scattered along shanghai subway system. The project will need advanced technology to supply fresh air and ensure safety. But the biggest concern is the stability of the soil under the city. Shanghai is sinking by 1.5 centimeters a year land-subsiding has been aggravated by over-pumping of underground water and the construction of thousands of high-rise buildings. "Shanghai" foundations are built on soft soil, so building multi-storied spaces underground would be like digging holes in a piece of bean curd, "the government report said. "The difficulties are easy to see."
The news is mainly about the city government's plan to ______.
A．expand and improve the existing subway system.
B．build underground malls and parking lots.
C．prevent further land subsidence.
D．promote advanced technology.
Brick and stone drains were constructed in various parts of Rome. The oldest existing one is the Cloaca Maxima which follows the course of an old stream. It dates back at least to the third century B.C. Later the drains were used for sewage, flushed by water from the public baths and fountains, as well as street storm run-off.
The truly surprising aspect of the achievements of all the ancient hydraulic artisans is the lack of theoretical knowledge behind their designs. Apart from the hydrostatics of Archimedes, there was no sound understanding of the most elementary principles of fluid behaviour. Sextus Frontinus, Rome's water commissioner around A.D. 100, did not fully realize that in order to calculate the volume rate of flow in a channel it is necessary to allow for the speed of the flow as well as the area of cross-section. The Romans' flow standard was the rate at which water would flow through a bronze pipe roughly 4/3 inch in diameter and 9 inches long. When this pipe was connected to the side of a water-supply pipe or channel as a delivery outlet, it was assumed that the outflow was at the standard rate. In fact, the amount of water delivered depended not only on the cross-sectional area of the outlet pipe but also on the speed of water flowing through it and this speed depended on the pressure in the supply pipe.
The Romansused all of the following to make water pipes EXCEPT ______
A．earth
B．wood
C．copper
D．stone
We can infer from the passage that ______.
A．English people like most people in other countries, dislike living in flats
B．people in most countries of the world today are not opposed to living in flats
C．people in Britain are forced to move into high blocks of flats
D．modem flats still fail to provide the necessary facilities for living
Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire(帝国). It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home country found itself faced by flood and starvation.
(77)(Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. )The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. (78)(So, unless the govemment has a good system of control, or can educate the people, the forests will slowly disappear.)
This does not only mean that the villagers' children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up allowing the rain to sink in - and also bind the soil, thus preventing its being washed away easily but where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
第6题：What is the most important function of trees？
A. Providing fuel. B. Offering shade.
C. Preventing natural disaster. D. Providing wood.
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