In AD 79, the ancient Roman city of Pompeii, in southern Italy,
Researchers, Danilo Campanaro and Giacomo Landeschi, from Lund University in Sweden, used data that were collected by drones to create
On the north bank of Fuxian Lake in Chengjiang County, Yunnan Province sits a straw-hat-shaped mountain
Scientists have obtained a large number of research results on Chengjiang Fossil Site. The reason why Chengjiang fauna (动物群) is
Up to now, more than 20 phyla and more than 280 species
The UNESCO evaluation says the Chengjiang Fossil Site is one of the
3 . In 1879, an 8-year-old girl made a discovery that would rock our understanding of human history. On the walls of Altamira cave in northern Spain, she spotted amazing drawings of wild cows, painted in vivid red and black. More striking even than the images was their age: they were made thousands of years ago by modern humans’ supposedly primitive ancestors. Today, nearly 400 caves across Europe have been found decorated with hand stencils (模板), strange symbols and beautiful images of animals created by these skillful artists.
The discoveries led to the view that artistic talent arose after modern humans arrived in the region some 40,000 years ago, as part of a “cultural explosion” reflecting a flowering of the human mind. But more recent evidence has blown this idea out of the water. For a start, modern humans might not have been the first artists in Europe. What’s more, a collection of cave paintings emerging in Indonesia has dismissed the idea that Europe was the centre of creativity.
Local people have long known that the caves of the island of Sulawesi, Indonesia, contain many painted images. Modern humans are thought to have reached the region some 65,000 years ago, but nobody imagined the art could be very old because ancient paintings seem unlikely to survive in the environment of high temperatures. A team of researchers led by Maxime Aubert, now at Griffith University in Australia, upended this idea using a technique that is shifting our understanding of cave art. Using this technique in seven caves, they found a hand stencil was at least 39,900 years old, making it the oldest known hand stencil at that time.
This opened a floodgate to new discoveries in Indonesia. These included a hunting scene created at least 43,900 years ago, and by far the oldest descriptive artwork. “When we found that image, we were absolutely delighted, but when it turned out to be that old, we were almost jumping with joy,” says Adam Brumm, also at Griffith University.
1. What did the girl find in the cave?| A．Wild animals. | B．Ancient images. |
| C．Painting techniques. | D．Recording artists. |
| A．It can be traced back to Europe. |
| B．It reflected the flowering of human minds. |
| C．Modern humans led to its rise in Indonesia. |
| D．Modern humans might not have been real artists. |
| A．Proved. | B．Strengthened. | C．Overturned. | D．Overemphasized. |
| A．The amazing discoveries. | B．The researchers’ expectations. |
| C．The benefits of the technique. | D．The description of the cave art. |
4 . No one is sure how the ancient Egyptians built the pyramids near Cairo. But a new study suggests they used a little rock ‘n’ roll. Long-ago builders could have attached wooden poles to the stones and rolled them across the sand, the scientists say.
“Technically, I think what they're proposing is possible,” physicist Daniel Bonn said.
People have long puzzled over how the Egyptians moved such huge rocks. And there's no obvious answer. On average, each of the two million big stones weighed about as much as a large pickup truck. The Egyptians somehow moved the stone blocks to the pyramid site from about one kilometer away.
The most popular view is that Egyptian workers slid the blocks along smooth paths. Many scientists suspect workers first would have put the blocks on sleds(滑板). Then they would have dragged them along paths. To make the work easier, workers may have lubricated the paths either with wet clay or with the fat from cattle. Bonn has now tested this idea by building small sleds and dragging heavy objects over sand. .
Evidence from the sand supports this idea. Researchers found small amounts of fat, as well as a large amount of stone and the remains of paths.
However, physicist Joseph West, who led the new study, thinks there might have been a simpler way. West said, “I was inspired while watching a television program showing how sleds might have helped with pyramid construction. I thought, ‘Why don't they just try rolling the things?’” A square could be turned into a rough sort of wheel by attaching wooden poles to its sides, he realized. That, he noted, should make a block of stone “a lot easier to roll than a square”.
So he tried it. He and his students tied some poles to each of four sides of a 30-kilogram stone block. That action turned the block into somewhat a wheel. Then they placed the block on the ground.
They wrapped one end of a rope around the block and pulled. The researchers found they could easily roll the block along different kinds of paths. They calculated that rolling the block required about as much force as moving it along a slippery(滑的) path.
West hasn't tested his idea on larger blocks, but he thinks rolling has clear advantages over sliding. At least, workers wouldn't have needed to carry cattle fat or water to smooth the paths.
1. It's widely believed that the stone blocks were moved to the pyramid site by _________.| A．rolling them on roads | B．pushing them over the sand |
| C．sliding them on smooth paths | D．dragging them on some poles |
| A．Made the paths wet. | B．Made the paths hard. |
| C．Made the paths wide. | D．Made the paths slippery. |
| A．Because more force is needed for sliding. |
| B．Because rolling work can be done by fewer cattle. |
| C．Because sliding on smooth roads is more dangerous. |
| D．Because less preparation on paths is needed for rolling. |
| A．An experiment on ways of moving blocks to the pyramid site. |
| B．An application of the method of moving blocks to the pyramid site. |
| C．An argument about different methods of moving blocks to the pyramid site. |
| D．An introduction to a possible new way of moving blocks to the pyramid site. |
| 出生年月 | 1938年7月 |
| 主要贡献 | 1. 建立“数字敦煌”； 2. 编写了许多与敦煌莫高窟相关的书籍。 |
| 评价 | 2019年9月，被授予“文物保护杰出贡献者”国家荣誉称号。 |
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