高中英语阅读理解科技类三.doc

高中英语阅读理解科技类三
Imagine，one day，getting out of bed in Beijing and being at your office in Shanghai in only a couple of hours，and then，after a full day of work，going back home to Beijing and having dinner there．
Sounds unusual，doesn't it? But it's not that unrealistic，with the development of China’s high—speed railway system．And that’s not a11． China has an even greater high—speed railway plan—to connect the country with Southeast Asia，and eventually Eastern Europe．
China is negotiating to extend its own high·-speed railway network to up to 17 countries in 1 0 to 15 years，eventually reaching London and Singapore．
China has proposed three such projects．The first would possibly connect Kunming with Singapore via Vietnam and Malaysia．Another could start in Urumqi and go through Kazakhstan and Uzbekistan，and possibly to Germany．The third would start in the northeast and go north through Russia and then into Western Europe．
If China’s plan for the high-speed railway goes forward，people could zip over from London to Beijing in under two days．
The new system would still follow China’s high—speed railway standard．And the trains would be able to go 346 kilometers an hour，almost as fast as some airplanes．
China’s bullet train(高速客车)，the one connecting Wuhan to Guangzhou，already has the
World’s fastest average speed．It covers 1,069 kilometers in about three hours．
Of course，there are some technical challenges to overcome．There are so many issues that need to be settled，such as safety，rail gauge(轨距)，maintenance of railway tracks．So，it’s important to pay attention to every detail．
But the key issue is really money．China is already spending hundreds of billions of yuan on
domestic railway expansion．
China prefers that the other countries pay in natural resources rather than with capital
investment．Resources from those countries could stream into China to sustain development．
It’11 be a win-win project. For other countries，the railway network will definitely create more opportunities for business，tourism and so on，not to mention the better communication among those countries．
For China，such a project would not only connect it with the rest of Asia and bring some much-needed resources，but would also help develop China’s far west．We foresee that in the coming decades，millions of people will migrate to the western regions，where the land is empty and resources unused．With high-speed trains，people will set up factories and business centers in the west once and for a11．And they’11 trade with Central Asian and Eastern European countries．
67．China’s new high-speed railway plan will be a win-win project because ．
A．China will get much-needed resources and develop its western regions
B．China and the countries involved will benefit from the project in various ways
C．China will develop its railway system and communication with other countries
D． the foreign countries involved will develop their railway transportation，business and tourism
68．According to the passage，the greatest challenge to the new high-speed railway plan is ． A．technical issues B．safety of the system
C．financial problems D．maintenance of railway tracks
69．Which of the following words best describes the author’s attitude towards China’s high-speed
railway plan?
A．Critical． B．Reserved． C．Doubtful D. Positive．
70．Which of the following might be the best title for the passage?
A．New Railway Standards B．Big Railway Dreams
C．High—speed Bullet Trains D．International Railway Network

B
Have you ever noticed the color of the water in a river or stream after a heavy rainfall? What do you think caused this change in color? It is soil that has been washed into the river from the riverbank or from the nearby fields．
Components of Soft
Soil is made up of a number of layers(层)，each having its own distinctive color and texture．The upper layer is known as the litter．It acts like a blanket, limiting temperature changes and reducing water loss．The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖质)，which is black and gives the topsoil its dark color．This layer is usually rich in nutrients，oxygen，and water．Below the topsoil is the subsoil，a layer that contains more stones mixed with only small amounts of organic matter．This layer is lighter in colour because of the lack of humus．Beneath the soil lies a layer of bedrock．
Soil forms from the bottom up．Over time bedrock is attacked by rain, wind，frost, and snow．It is gradually broken down into smaller particles in a process called weathering．Plants begin to grow，and rotten materials enrich the topsoil．Most of the soil in Eastern Canada, for example, was formed from weathered rock that was exposed when the ice disappeared l2, 000 years ago．
Water Beneath the Soil
Surface water collects and flows above the ground in lakes, ponds, and rivers．Once in the soil or rock，it is called groundwater．Gravity pulls groundwater through the soil in a process called percolation(渗透)．Eventually the water reaches a layer called the water table．Under this is bedrock through which water cannot percolate．
As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers．This causes a serious problem because plants require these nutrients for growth.
Soil pH
Soil can be acidic, neutral, or basic．The pH of the soil is determined by the nature of the rock
from which it was formed, and by the nature of the plants that grow and rot in it．
The acidity of rain and snow can lower the pH of the groundwater that enters the soil．By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils．When fossil fuels are burned, gases are released into the air and then fall back to earth as acid rain．Acid soil increases the problem of carrying nutrients to lower soil levels．As nutrients are removed，soil is less fertile．Plants grow more slowly in acidic soil，and also become easily attacked by diseases．
67．The layer of soil that provides necessary nutrients for plant growth is called．
A．1itter B．topsoil C．humus D．subsoil
68．According to the text．which of the following is NOT true?
A．Soil forms from weathered rock on the earth surface．
B．The deeper layer of soil is darker in color than the surface soil．
C．Air pollution is partially responsible for acid soil．
D．Groundwater tends to carry away nutrients for plant growth．
69．We can infer from the passage that the water table lies ．
A．between the topsoil layer and the subsoil layer B．in the subsoil layer above bedrock
C．between the subsoil layer and bedrock D．in the bedrock layer beneath the subsoil
70．The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are ．
A．rushed away into the river B．cleaned and purified by water
C．destroyed and carried away by water D．mixed with water and become part of it

67 .B 68 .C 69. D 70 .B
67．B 68．B 69．C 70．D