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更多“Rich mineral deposits in this country have relocated manufacturing industry of Southeast A”相关的问题
Little______ that the area was so rich in mineral resources.
A．we expected
B．we expect
C．did we expect
D．expected we
A.Little
B.A little
C.Few
D.A few
We cannot infer from the article that ______．
A．there are abundant mineral reserves in the mountains
B．China's mineral deposits are evenly scattered
C．China is rich in non-metal deposits
D．Research and exploration in the eastern and western parts of China have to be intensified
Nautilus Minerals, based in Vancouver, is the more advanced of the pair. It has an exploratory licence from Papua New Guinea and has already begun drilling operations 1,600 metres below sea level off the east coast of the country. Another company, Neptune Minerals, based in London and Sydney, has completed test drilling in the deep waters near New Zealand.
Nautilus's deep-water exploration relies on a modified deep-sea remotely operated vehicle (ROV) of the kind normally used in the oil anti telecom industries. It has a manipulator hand containing drilling and cutting tools that allow the robot to retrieve samples of rock from the ocean bed. So far the drilling has only been exploratory, but the prospects look good.
The presence of these rich deposits has been known about for years, says Steven Scott, a geologist at the University of Toronto. He has been researching underwater geology since the 1980s, and in the 1990s he co-discovered the deposit that Nautilus is exploring. So why has it taken so long to move towards the commercial exploitation of deep sea massive sulphide deposits？ Mr. Heydon (the boss of Nautilus) says it is because the ROV technology has only recently be come capable enough. He eventually hopes to use rock-cutting ROVs that will drive across the sea floor, grinding ore as they go and sending it to the surface via a tube at a rate of 400 tonnes per hour. It might also be possible to lift large deposits using compressed air.
All of this can be done, Mr. Heydon believes, for about half as much as opening a new land based mine. Nautilus has spent about $12m in the past year on exploration, and Dr Scott says one test drilling found deposits 19 metres deep. Unlike manganese (锰) mines, which are like golf balls scattered across the seabed, these deep-ocean deposits occur in small areas around extinct hydrothermal vents. Such concentrated deposits ought to make underwater mining highly efficient.
Even if the economies stack up. however, Nautilus and Neptune must overcome concerns over environmental damage. Dr Scott argues that underwater mining will be far less disruptive to the environment than terrestrial mining: there will he no piles of waste rock, since the deposits arc directly on the sea floor. And whereas the oil industry lays pipelines underwater, mining would not leave any permanent structures behind. But governments will need to be convinced of the merit of these arguments before mining can begin.
What do we know from the first paragraph？
A．No mineral companies have succeeded in deep-sea mining.
B．Oil and gas have been regarded as the most useful deep-sea wealth.
C．Only oil and gas industry has been interested in deep-sea mining.
D．The deep-sea mineral wealth has recently become the dream of miners.
A．had quite limited business
B．were open to the rich people only
C．had difficulty attracting customers
D．did not offer savings deposit service
China's Mineral Deposits
China's vast territory and complicated geological formations create favorable conditions for mineralization. Rich mineral deposits are found on the plains and in the mountains.
Reserves of over 50 metals and nearly 80 non-metals have been discovered, in addition to rich fuel-bearing deposits. These include rich deposits of nonferrous metal, rare-earth metal, coal and certain non-metals. The proved reserves of a number of minerals are among the richest in the world, including rare earth, coal, iron, copper, tin, lead, zinc and aluminum. The prospects for petroleum and natural gas are also bright. The abundance of minerals provides a solid material basis for the country's modernization.
Nevertheless, there are also some inadequacies. Most of the minerals are unevenly distributed and the prospects of some reserves are not clear. Insufficient reserves have been proved for some minerals: others, such as iron and copper, do not usually occur in rich veins.
The reserves of quite a number of minerals are among the largest in the world, but the per capital amount is smaller than that in many other countries.
Although China has conducted a great many preliminary surveys, the work has to be in tensified in the eastern part of the country, and it has hardly begun in many places in the west. Prospecting and exploitation are still rather backward. China has only just opened the door to its underground treasure house, where the mysteries have by no means been uncovered. With the progress in geological research and exploration, more and better minerals will be found.
Which minerals have been proved to be insufficient？
A．Lead and aluminium.
B．Rare-earth metal and coal.
C．Zinc and tin.
D．Not indicated directly.
The main energy foods are the carbohydrates (碳水化合物). These are sugars and starch (淀粉). Wheat and rice are rich in starch and many fruits and vegetables contain considerable amount of sugar. Sweets, honey and jam are also rich in sugar.
Like carbohydrates, fats are food that provides us with energy. Butter, margarine, certain types of fish, eggs, cooking oils and most red meats are rich in fats. Fats can be stored in various parts of the body as reserves of energy. Because fats in general are slowly digested, they satisfy hunger for long periods.
Proteins (蛋白质) are very complex substances. The body needs proteins for the growth of new cells and for the repair and replacement of old cells. Foods rich in proteins are essential to a balanced diet. Milk, some vegetables, meat, chicken, fish, cheese, grains and nuts are some foods rich in proteins.
A good diet will contain a variety of foods so that the body contains all the minerals it needs for good health.
Vitamins are necessary for the proper working of the body. If we eat a variety of foods, we can be sure of obtaining all the vitamins we need.
Water makes up about 70 per cent of the weight of the human body. The average adult needs about two liters of water daily to replace the water the body loses.
If equal weight of the following substances is “burned” in the body, the largest amount of energy is produced by().
A、carbohydrates
B、fats
C、vitamins
D、mineral salts
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