Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese science.
In ancient times, the region in which Dujiangyan now stands
Once the system was finished, no more floods occurred and the people were able to live
A fan can drive summer heat away and help bring a cool breeze (微风).
The fan first appeared in China about 3,000 years ago, in the Shang and Zhou dynasties. In the early period, the fan was called “the fan of honor”,
After the Qin and Han dynasties, the main
During the Sui and Tang dynasties, the common fans were round fans, feather fans, and some paper fans. The folding fan
Carved in Binyangzhong Cave, an imperial cave excavated in the Northern Wei Dynasty (386-534), the relief sculpture(浮雕)Emperor and Empress Pay Respect for Buddha is a national treasure of great historic and
In
In order to restore the
“Actors started studying materials a month in advance, imitating the looks of the characters from the sculpture, and then rehearsed many times
“The painting shows the development of ancient Chinese painting and sculpture,
When the Library Cave, known as Cave 17 from the Mogao Cave Complex at Dunhuang, China, was opened in 1900, several tons of manuscripts, scrolls, booklets and paintings on silk and paper
Cave 17 is only one of the 735 human-made caves
The Dunhuang Academy was set up in China in
China boasts its brilliant and long history, in
Bi Sheng of the Northern Song Dynasty (AD 960 —1127) invented the movable type printing, using individual blocks. The blocks could each print a single character and then be used
By the Shang Dynasty (around 1600-1046 BCE), these symbols
7 . The Maya city of Tikal is famous for its amazing palaces and temples. But something far more ordinary kept Tikal functioning: its water-purifying(净化) system, the earliest known of its kind.
Researchers recently discovered a volcanic mineral that traps microbes(微生物) and heavy metals in Tikal's largest reservoir(水库). Because the material is not found nearby, the finding suggests the presence of a man-made water-purifying device.
The finding denies the long-standing idea that the ancient worlds technological achievements belonged to the Eastern world, like Egypt, and China. The leading scientist of this research, Kenneth Tankersley says, “When talking about purifying water, the Maya were thousands of years ahead.”
Located in the forests of Central America, Tikal, is thought to have been home to more than 45,000 people. They had to struggle against a dry season lasting from November through April. Storing water in reservoirs was a solution, but that water had to be fit to drink, said Kenneth, “Keeping water clean was of great importance.”
A few years ago, the researchers were surprised to find that the largest reservoir, Corriental, had significantly fewer harmful chemicals than the others. “The water quality at Corriental was much higher.”
Somehow the Maya must have been purifying Corriental’s water, the team assumed. “The Maya used gardens as their bathrooms.” Kenneth said, “The water coming into the reservoir would not have been very clean.”
At the bottom of Corriental, scientists found four separate layers(层), each a few centimeters thick, of millimeter-scale “zeolites(沸石)”. This type of volcanic mineral can purify water and is still in widespread use today, Kenneth says, “Just about everything we drink, from bottled water to wine, runs through a zeolite purifying device.”
The Maya wouldn’t have known about the zeolite in rock, but they would have recognized the purifying effects, the researchers suggest. A zeolite-rich rock formation about 30 kilometers northeast of Tikal is the likely source of the material in Corriental reservoir, the team said last month in Scientific Reports. Water at this site “was clear and tasted good.”
1. What did the researchers find?| A．A new material called zeolites. | B．The purifying effects of zeolites. |
| C．An old water-purifying system. | D．High-quality water in Corriental. |
| A．By building the largest reservoir. | B．By using gardens as their bathrooms. |
| C．By getting rid of heavy metals. | D．By spreading four layers of zeolites. |
| A．The Maya drank bottled water. | B．The ancient Maya were very bright. |
| C．The system was created by accident. | D．The zeolites were found in Corriental. |
| A．the original water in Corriental was not clean enough |
| B．water supply in Tikal lasted from November to April |
| C．all ancient technological achievements belonged to the East |
| D．the Maya had a good understanding of the zeolite in rocks |
Lanzhou, 9 August 2017. A group of researchers and scientists from China and other countries are working together to help increase knowledge and
9 . Skyscraper didn’t always mean a tall building. The earliest reference to the word dates back to 1788, when it was used to describe a really tall horse, according to The Oxford English Dictionary. By the 1790s, a Philadelphia doctor had used the term to describe the triangular sail at the very top of a ship.
After the Great Chicago Fire of 1871, the Home Insurance Company hired architect William Jenney to design a tall, fire-proof head office. Jenney was inspired to design the building’s steel framework (框架)after his wife placed a heavy book on a small birdcage and found that the cage supported the weight. Today, that revolutionary structure is widely considered to be the first skyscraper.
Since then, the competition to build the world’s tallest building has been as sharp as the top of the Empire State Building. In the late 1920s, Walter Chrysler and his architect arranged for the secret construction of a roof that added 125 feet of height to the new Chrysler Building, making it 1,046 feet tall. The plan allowed them to eclipse(使逊色)the 927-foot Bank of Manhattan Trust Building.
However, only 11 months after the Chrysler Building was ranked the world’s tallest, it was surpassed by a new neighbor — the Empire State Building. Yet when it opened in 1931, less than 25 percent of the building was occupied. New York jokers called it the “Empty State Building”.
The largest skyscraper in the world always seems to be under construction. Jeddah Tower in Saudi Arabia is the latest and it’s expected to stretch nearly one kilometer (3, 280 feet) into the sky.
1. What did the word “skyscraper” originally mean？| A．A triangular sail. | B．A high building. |
| C．A fire-proof head office. | D．An extremely tall horse. |
| A．given away | B．left behind | C．put off | D．taken up |
| A．It was ranked the world’s tallest. |
| B．Tourists were not allowed to visit it. |
| C．Its construction lasted eleven months. |
| D．Only a few people lived or worked in it. |
| A．In order of time. | B．In order of space. |
| C．By analyzing causes. | D．By giving definitions. |
Confucius, China’s most famous teacher and philosopher, was born Kongqiu in 551 BCE near Qufu, in eastern China. Confucius showed a great interest
Confucius believed that education and reflection led to virtue. He once worked for the government, but
As stated in The Analects, Confucius believed that social harmony would
Confucius
