The tracks found at New Mexico’s White Sands National Park are turning upside down past assumptions on when humans first came into North and South America. They look like they were left behind just moments ago by a barefoot teen visitor to New Mexico’s White Sands National Park, each footprint freshly defined (描出外形) by sand. But this is no tourist track. These footprints are among the oldest evidence of humans in the Americas, marking the latest addition to a growing body of evidence that challenges when and how people first got into this unexplored land.
According to the research team, the footprints were pressed into the mua near an ancient lake at White Sands between 21, 000 and 23, 000 years ago, a time when many scientists think that huge ice sheets walled off human passage into North America.
Exactly when humans populated the Americas has been heatedly debated for nearly a century, and until recently, many scientists insisted that this first occurred no earlier than 13, 000 years ago. A growing number of discoveries suggest people were in North and South America thousands of years before. These include the Monte Verde site in Chile that is as old as 18, 500 years and the Gault site in Texas that is up to 20,000 years old. But each find kicks up a firestorm of controversy among scientists.
While the White Sands discovery doesn’t close the book on these debates, it is stirring excitement. “A discovery like this is very close to finding the Holy Grail (圣杯),” says Ciprian Ardelean, an archacologist at the Chiquihuite Cave in Mexico, where researchers believe they have evidence for human activity in the Americas as early as 30,000 years ago.
If confirmed, the discovery of people in the Americas during the last glacial maximum (末次盛冰期)would require a major change in scientifie thinking about how people arrived in the New Werld.
1. What is the previous conclusion on the first arrivals of Americas?A.Humans came into Americas about 23, 000 years ago. |
B.Humans first appeared in Americas to explore the land. |
C.Humans didn’t arrive in Americas until 13, 000 years ago. |
D.Humans couldn’t enter Americas because of White Sands. |
A.To add evidence. | B.To introduce the background. |
C.To give data. | D.To end the debate. |
A.Excitement. | B.Argument. | C.Disagreement. | D.Interest. |
A.Trustworthy. | B.Questionable. | C.Inspiring. | D.Disappointing. |
A.Humans populated the Americas for nearly one hundred years. |
B.The tracks were found at New Mexico’s White Sands National Park. |
C.The footprints are among the oldest evidence of humans in the Americas. |
D.Surprising footprints push back human arrival in Americas by thousands of years. |
Several large wooden constructions
First discovered in 1978,the site used
Researchers
Researchers believe
3 . It is likely that on American TV shows you at times will be attracted by rubber balls on people’s desks.
Indeed, stress is a big problem for many people.
A.This helped them relax as well. |
B.These gadgets may look like simple toys. |
C.It keeps your hand busy with an easy task. |
D.These balls are known as “stress relief balls”. |
E.Fortunately, we have many ways to deal with it. |
F.This was the perfect way to ease away your tension. |
G.A focused activity helps take your mind off the problems of your day. |
It seems inhuman to care more about a building than about people. That the sight of the Notre Dame's
It is not just the economy that is
However, the emotions are less about the building itself than about
And it will be rebuilt. It will never be the same, but that is as it should be.
5 . Until recently, several lines of evidence — from fossils genetics, and archaeology — suggested that humans first moved from Africa into Eurasia (the land of Europe and Asia) about 60,000 years ago, quickly replacing other early human species, such as Neanderthals and Denisovans, that they may have met along the way.
However, a series of recent discoveries, including 100,000-year-old human teeth found in a cave in China, have clouded this straightforward statement. And the latest find, a prehistoric jawbone at the Misliya Cave in Israel dating back to nearly 200,000 years ago, which is almost twice as old as any Homo sapiens (智人) remains discovered outside Africa, where our species was thought to have originated from, has added new and unexpected twist.
The find suggests that there were multiple waves of migration across Europe and Asia and could also mean that modern humans in the Middle East were interacting, and possibly mating, with other human species for tens of thousands of years. “Misliya breaks the mould (模式) of existing assumptions of the timing of the first known Homo sapiens in these regions,” said Chris Stringer, head of human origins at the Natural History Museum in London. “It’s important in removing long-lasting-constraint (限制) on our thinking.”
Prof. Hershkovitz, who led the work at Tel Aviv University said, “What Misliya tells us is that modern humans left Africa not 100,000 years ago, but 200,000 years ago. This is revolution in the way we understand the evolution of our own species.” He also added that the record now indicates that humans probably travelled beyond the African continent whenever the climate allowed it. “I don’t believe there was one big departure from Africa,” he said. “I think that throughout hundreds of thousands of years humans were coming in and out of Africa all the time.”
The discovery means that modern humans were potentially meeting and interacting during a longer period with other ancient human groups, providing more opportunity for cultural and biological exchanges. It also raises interesting questions about the fate of the earliest modern human pioneers. Genetic data from modern-day populations around the world strongly suggest that everyone outside Africa can trace their ancestors back to a group that left around 60,000 years ago. So, the inhabitants of the Misliya Cave are probably not the ancestors of anyone alive today, and scientists can only guess why their branch of the family tree came to an end.
1. What does the underlined word “they” refer to in Paragraph 1?A.Early human species living in Europe. |
B.Neanderthals and Denisovans. |
C.People first moving from Africa into Eurasia. |
D.Ancient people living in Africa all the time. |
A.Our ancestors were powerful and kind of aggressive. |
B.Our ancestors left Africa much earlier than thought. |
C.The origins of modern humans are from Europe. |
D.Homo sapiens, Neanderthals and Denisovans once lived together. |
A.Climate was a big factor in human migration from Africa. |
B.There was a large-scale human migration from Africa. |
C.Human migration was occasional in Africa 200,000 years ago. |
D.The Misliya find is against our understanding of human evolution. |
A.They were ancestors of people living in China. |
B.They left evidence for their mysterious disappearance in history. |
C.They probably contributed little to present-day people genetically. |
D.They could be traced by their remains left on their travelling route. |
1. Where does Thomas Manning work?
A.In the Guinness Company. |
B.At a radio station. |
C.In a museum. |
A.A bird-shooting trip. |
B.A visit to Europe. |
C.A television talk show. |
A.In 1875. | B.In 1950. | C.In 1955. |
A.More records of unusual facts. |
B.The founder of the company. |
C.The oldest person in the world. |
7 . Lost cities that have been found
The White City
In 2015, a team of explorers to Honduras in search of"the Lost City of the Monke God"led to the discovery of the White City. They found the ruins in the Mosquitia region of the Central American country which is known for poisonous snakes, vicious jaguars and deadly insects. It is believed that local people hid here when the Spanish conquerors(征服者) occupied their homeland in the16th century.
Canopus and Heracleion
Modern researchers were teased by the ancient writings about the Egyptian cities Canopus and Heracleion- where Queen Cleopatra often visited. But the cities weren’t found until 1992, when a search in Alexandria waters found that the two cities had been flooded for centuries. Artifacts(史前器物) showed that the cities once highly developed as a trade network, which helped researchers piece together more about the last queen of Egypt.
Machu Picchu
A Yale professor discovered "the Lost City in the Clouds"in 1911. A combination of palaces, plazas, temples and homes, Machu Picchu displays the Inca Empire at the height of its rule. The city, which was abandoned in the 16th century for unknown reasons,was hidden by the local people from the Spanish conquerors for centuries keeping it so well preserved.
Troy
The ancient city of Troy in homer's The Iliad was considered a fictional setting for his characters to run wild. But in 1871, explorations in northwestern Turkey exposed nine ancient cities layered (层叠) on top of each other, the earliest dating back to about 5,000 years before. It was later determined that the sixth or seventh layer contained the lost city of Troy and that it was actually destroyed by an earthquake, not a wooden horse.
1. Why did people hide in the White City in the 16th century?A.To survive the war |
B.To search for a lost city. |
C.To protect their country. |
D.To avoid dangerous animals |
A.The White City |
B.Canopus and Heracleion |
C.Machu Picchu |
D.Troy |
A.It was built by Homer. |
B.It consisted of nine cities |
C.It had a history of 5,000 years |
D.It was ruined by a natural disaster. |