In the 1920s, the American economy was very strong, and life was good. World War I
Then, on october 24, 1929, the stock market crashed. Suddenly, life changed for millions of people. Instantly, people lost billions of dollars in stock. Companies went bankrupt.
In 1932, Franklin Roosevelt was elected the new president of the United States. Roosevelt had a plan to end the Great Depression. His plan was called the New Deal. He increased the influence of the government on the economy. He tried to have the government
Originally unearthed in the late 1920s, the Sanxingdui Ruins have been regarded as one of the world’s greatest archaeological
One iconic (标志性的) exhibit is the four-meter-tall bronze sacred tree,
Divided into three themed areas, the exhibition hall makes use of a range of new technologies
The United Kingdom has several names and many people
The four countries
The United Kingdom has a long and interesting history to explore, which can help you learn more about the country and its traditions. Wherever you go in the UK, you are surrounded
The first group, the Romans, came in
A city’s name can often indicate its status in a nation’s history. Nanjing, meaning “southern capital city” literally in Chinese, could claim such an influential
The city, now capital of East China’s Jiangsu Province, was once
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The latest archaeological findings may reshape the city’s history, with
More than 3,000 stone tools have been unearthed during the latest work at the Piluo site, a large-scale Paleolithic site
The Piluo site,
The latest stage, kicking off in July, was the third of its kind and covered about 150 square meters,
According to
The
Named after the ancient city of Xi’an in Shaanxi province, the film Chang’an lasts 168 minutes and brings to life some of the most famous
Since its release on July 8, the movie
Different from many movies and TV shows
Interweaving(交织)the personal fates of these figures, the film shows the scenes of the Tang dynasty. The movie also
As there have been so many different styles of Western art, perhaps the best way
The Olympics play
The 2008 Beijing Olympics appealed
10 . Stonehenge is hiding a secret: the source of one of its stones.
Researchers know that the prehistoric circle’s outer stones come from nearby areas in England. But even after a century of study, the Altar Stone near the center of Stonehenge remains difficult to understand.
The Altar Stone belongs to a group of Stonehenge building blocks known as the bluestones, which came from areas far from Stonehenge. Researchers have found that some of the bluestones come from as far as 225 kilometers away.
“It’s a massive job of transport,” says Richard Bevins, an earth scientist at Aberystwyth University in Wales. His team is looking for the source of the Altar Stone. Uncovering the stone’s origins could suggest which ancient groups of people contributed to the building.
Scientists have been working to find the rock’s origins since 1923. A report about the Altar Stone’s minerals back then suggested it might have come from a set of rocks in Wales near where other bluestones cane from. Bevins’ team decided to revisit the rock’s riddle with modern techniques.
In 2021, the team analyzed (分析) the Altar Stone’s chemical makeup using X-rays. The X-ray method showed that the Altar Stone has high levels of the element barium (钡). But the stone’s makeup didn’t seem to match the rocks in Wales.
In the new study, the team collected 58 samples (样本) from a wider area in England and Wales. Of the 58 sample stones, four had high barium levels similar to the Altar Stone. The team then compared the overall mineral makeup of those four stones with the Altar Stone. But none were a match.
“Maybe we’ve been looking in the wrong area, and maybe we’ve possibly been looking at rocks of the wrong age,” Bevins says, “It’s not clear exactly how old the Altar Stone is.” So scientists may need to consider stone sources that are younger than the ones they have looked at so far.
1. Where do the outer stones of Stonehenge come from?A.Wales, | B.Scotland. | C.Ireland. | D.England. |
A.Its sample. | B.Its finding. | C.Its preparation. | D.Its application. |
A.Date the Altar Stone. | B.Make the 1923 report public. |
C.Sell the sample stones. | D.Move their office to the UK. |
A.It looks pretty young. | B.It was built by the locals,. |
C.Its origin remains unknown. | D.Its makeup is the same as others’. |