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更多“The stone chamber is the most popular dwelling in Tibet and some areas of Inner Mongolia.”相关的问题
A、Wu Chengen
B、Cao Xueqin
C、Shi Naian
D、Luo Guanzhong
As I stood there, I reflected on where I was. Was I in the middle of the tomb of a king, the most powerful ruler the world has ever known？ Or was I at the center of something much more mysterious？ A monument of such mathematical accuracy and advanced architecture that the modern world can only marvel at？ A magical shape built by a civilization whose knowledge and wisdom have been lost today？
I was silent in wonderment. The Great Pyramid at Giza, built for the Pharaoh Cheops, is large, to say the least. It is built from 2300000 blocks of stone, each weighing 15 tons, and as Napoleon's scientists calculated, it contains enough stone to build a huge wall all around France. At the time when it was completed (over 5,000 years ago), it must have been magnificent-covered in white limestone and topped by a cap of solid gold. Yet ever today it is a marvel—and even more than that, a mystery. How did the Egyptians (who still hadn't discovered the wheel) build such a huge monument; each stone put together with such precision that architects today would have difficulty copying？ How were these huge stones cut, carried and lifted into place, when the people only had simple wooden rollers, levers and primitive tools？
But perhaps these are the least of the Great Pyramid's mysteries. For it is quite possible that this pyramid was not used as a tomb at all. In A.D. 800, when the Sultan of Baghdad, Al Mamud, finally managed to reach the central burial chamber of Cheops (after tunelling passed large stones that blocked the entrance), he found nothing! The chamber was empty. Unlike other tombs that possessed the kings' priceless treasures, this one was completely empty. Nothing was there.
Was the Great Pyramid something other than a tomb？ In 1638 an Oxford professor measured the king's chamber and was shocked by its "exact" size. Even Sir Isaac Newton became interested in the pyramid's perfect shape. However, it was John Taylor, the editor of The Observer, whose studies brought about the most amazing discovery. He showed, quite clearly, by the measurements of the pyramid, that the early Egyptians must have known the value of pi. Amazingly, they were 4000 years ahead of their time.
The Pyramid of Cheops now became a great mystical symbol with strange magical powers. It has even been suggested recently that it was built with the help of aliens from outer space. A UFO landed and its occupants taught the Egyptians all their skills.
On a more realistic level, British astronomer Richard Proctor believed that the pyramid was a hut observation room for viewing the stars and calculating the movement of the heavens, Not only are the sides of the pyramid perfectly lined to the tour points the compass, but the passage to the king chamber is precisely in line with it Pole Star. It became, obvious that builders of the pyramid also knew that the World was round. They knew the exact itude of the Earth, the length of the Earth's orbit around the sun, the acceleration of gravity and the speed of light. Another idea is that this shape is a giant clock-its great shadow use for calculations on the sand. The Egyptians could keep a constant record of time and know easily the length each year. In fact the Czech engineer Karel Drbal was so interested in all he heard about the Great Pyramid that he built a small replica of it out of wood. He found a definite relationship between the shape of the space inside the pyramid and the physical, chemical and biological processes going on inside the space. Into his pyramid he
A．nothing
B．it full of treasure
C．the body of the Pharaoh
D．a terrible monster
The【C4】______ of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the【C5】______ boats using it to【C6】______ each other easily. It must be deep enough to leave about two feet of water【C7】______ the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly【C8】______ Canals that are cut through rock can have nearly Vertical sides.【C9】______ , canals with earth banks may【C10】______ if the angle of their sides is too steep. Some canals are lined with brick, stone, or concrete to keep the water【C11】______ soaking into the mud. This also permits ships to go at【C12】______ speeds, since they cannot make the banks fall in by【C13】______ up the water. In small canals with mud banks, ships and barges (大平底船) must【C14】______ their speed.
When the canal goes【C15】______ different levels of water, the ships must be【C16】______ or lowered from one level to the other. This is generally done by【C17】______ of locks. If a ship wants to go Up to higher water, the lower end of the lock opens to let the boat in. Then this gate closes, and the water is let into the lock chamber from the upper level. This raised the level of the water in the lock 【C18】______ it is the same as the upper level of water. Now the upper gates can be opened to【C19】______ the ship into the higher water. Sometimes a canal contains a series of locks when the【C20】______ in levels is very great.
【C1】
A．take
B．save
C．cost
D．waste
The【B4】of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the【B5】boats using it to【B6】each other easily. It must be deep enough to leave about two feet of water【B7】the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly【B8】Canals that are cut through rock can have nearly vertical sides.【B9】, canals with earth banks may【B10】if the angle of their sides is too steep. Some canals are lined with brick, stone, or concrete to keep the water【B11】soaking into the mud. This also permits ships to go at【B12】speeds, since they cannot make the banks fall in by【B13】up the water. In small canals with mud banks, ships and barges(大平底船) must【B14】their speed.
When the canal goes【B15】different levels of water, the ships must be【B16】or lowered from one level to the other. This is generally done by【B17】of locks. If a ship wants to go up to higher water, the lower end of the lock opens to let the boat in. Then this gate closes, and the water is let into the lock chamber from the up- per level. This raised the level of the water in the lock【B18】it is the same as the upper level of water. Now the upper gates can be opened to【B19】the ship into the higher water. Some-times a canal contains a series of locks when the【B20】in levels is very great.
【B1】
A．take
B．save
C．cost
D．waste
The【B4】of a canal depends art the kind of boats going through it. The canal must. be wide enough to permit two of the【B5】boats using it to【B6】each other easily. It must be deep enough to leave about two feet of water【B7】the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly【B8】. Canals that are cut through rock can have nearly vertical sides【B9】, canals with earth banks may【B10】if the angle of their sides is too steep. Some canals are lined with brick, stone, or concrete to keep the water【B11】soaking into the mud. This also permits ships to go at【B12】speeds, since they cannot make the banks fall in by【B13】up the water. In small canals with mud banks, ships and barges(大平底船) must【B14】their speed.
When the canal goes【B15】different levels of water, the ships must be【B16】or lowered from one level to the other. This is generally done by【B17】of locks. If a ship wants to go up to higher water, the lower end of the lock opens to let the boat in. Then this gate closes, and the water is let into the lock chamber from the upper level. This raised the level of the water in the lock【B18】it is the same as the upper level of water. Now the upper gates can be opened to【B19】the ship into the higher water. Sometimes a canal contains a series of locks when the【B20】in levels is very great.
【B1】
A．take
B．save
C．cost
D．waste
At first this did not seem like a particularly hard task. Scientists began to try making synthetic diamonds towards the end of the eighteenth century. It was at this time that a key scientific fact was discovered: diamonds are a form. of carbon, which is a very common element. Graphite, the black mineral that is used for the lead in your pencil, is made of it, too. The only difference, we know today, is that the carbon atoms have been packed together in a slightly different way. The chemists were fired with enthusiasm: Why not change a cheap and plentiful substance, carbon, into a rare and expensive one, diamond？
You have probably heard about the alchemists who for centuries tried to turn plain lead or iron into gold. They failed because gold is completely different from lead or iron. Transforming carbon into diamonds, however, is not illogical at all. This change takes place in nature, so it should be possible to make it happen in the laboratory.
It should be possible, but for one hundred and fifty years efforts failed. During this period, none the less, several people believed that they had solved the diamond riddle. One of these was a French scientist who produced crystals that seemed to be the real thing. After the man's death, however, a curious rumour began to go the rounds. The story told that one of the scientist's assistants had simply put tiny pieces of genuine diamonds into the carbon mixture. He was bored with the work, and he wanted to make the old chemist happy.
The first real success came more than sixty years later in the laboratories of the General Electric Company. Scientists there had been working for a number of years on a process designed to duplicate nature's work. Far below the earth's surface, carbon is subjected to incredibly heavy pressure and extremely high temperature. Under these conditions the carbon turns into diamonds. For a long time the laboratory attempt failed, simply because no suitable machinery existed. What was needed was some sort of pressure chamber in which the carbon could be subjected to between 800,000 and 1,800,000 pounds of pressure to the square inch, at a temperature of between 200°F and 2,200°F.
Building a pressure chamber that would not break under these conditions was a fantastically difficult feat, but eventually it was done. The scientists eagerly set to work again. Imagine their disappointment when, even with this equipment, they produce all sorts of crystals, but no diamonds. They wondered if the fault lay in the carbon they were using, and so they tried a number of difficult forms. They failed again and again but went on working. The idea was then brought forward that perhaps the carbon needed to be dissolved in a melted metal. The metal might act as a catalyst, which means that it helps a chemical reaction to take place more easily.
This time the carbon was mixed with iron before being placed in the pressure chamber. The pressure was brought up to 1,100,000 pounds to the square inch and the temperature to 900℉. At last the chamber was opened. A number of shiny crystals lay within. These crystals scratched glass, and even diamonds. Light waves passed through them in the same way as they do through diamonds. Carbon dioxide was given off when the crystals were burned. Their density was just 3.5 grams per cubic centimeter, as is true of diamonds. The crystals were analyzed chemically. They were finally studied under X-rays, and there was no longer room for doubt. These jewels of the laboratory were not like diamonds; they were diamonds. They even had the same atomic structure.
The main idea of Paragraph 2 is that______.
A．making artificial diamonds didn't seem very difficult at first sight
B．scientists began to try making synthetic diamond in the late 1700s
C．scientists discovered diamonds are a form. of carbon, a common element
D．the discovery of the diamonds' constitute impelled scientists to make a synthetic one
A、Water Margin
B、Journey to the West
C、Dream of the Red Chamber
D、Romance of the Western Chamber
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