In 2016, the first phase of the Digital Huang resource database went online. People from all over the world could enjoy high-quality
2 . These days, Fred’s huge skeleton (骨架) was exhibited in the Indiana State Museum. His tusks (长牙) were recently the subject of a research study tracing the life 13,000 years ago of mastodons, distant relatives of modern elephants.
By analyzing the chemicals in Fred’s tusks, a team of researchers was able to construct a detailed account of his seasonal migration patterns. Josh Miller, a paleoecologist (古生态学家) at the University of Cincinnati, is one of the researchers studying Fred. “He has beautifully preserved bones and tusks, which provides a great opportunity for our research,” Miller said.
Mastodons’ tusks generally grow in distinct layers, similar to the tree rings. As a result, the nutrients that build the layers of their tusks can tell us a lot about what they experienced. The team particularly focused their analysis on the variations in two elements in the layers: strontium (锶) and oxygen. The former is the key to understanding where Fred spent his life, while the latter tells us the season he was in any particular region. Then, with some statistical modeling, Miller and his team gained insight into the daily record of Fred’s behavior over ten thousand years ago.
The result indicated that when Fred was young, he would have grown a lot. But there’s a year when his growth is reduced — that’s when Miller’s analysis starts. “Probably like the modern male elephant, a male mastodon is just really obnoxious when growing up to be a bother and often arouses family members’ anger. At that point, the mom and aunts will essentially kick him out of the family”, Miller predicted.
After Fred set off to attend to himself, his tusks reflected where he traveled around. Based on analysis, every summer, Fred would return to mate in Northeastern Indiana, because around this time, his tusks started to show signs of injuries. When competing for mates, mastodons got into huge battles with their own natural weapons, sharp tusks. And that was exactly what brought the story of Fred to an untimely end.
1. What does Miller’s study mainly focus on?| A．Inner structure of Fred’s skeleton. | B．Possible tracks of Fred’s migration. |
| C．Research value of mastodon fossils. | D．Effective ways of tusk preservation. |
| A．By modeling data of special chemical elements. | B．By comparing his layers of tusks with rings of trees. |
| C．By conducting field researches in various regions. | D．By reviewing statistical records of previous studies. |
| A．Mature. | B．Greedy. | C．Ambitious. | D．Annoying. |
| A．He failed to live independently. | B．He reunited with his family later. |
| C．He got killed by opponents’ tusks. | D．He survived some natural disasters. |
1. What did British scientists find about Stonehenge?
| A．Why people built it. |
| B．Where some stones were from. |
| C．How people moved the stones. |
| A．They kept it secret. |
| B．They used it to build structures. |
| C．They performed chemical testing. |
| A．A research on Stonehenge. |
| B．The secrets of Stonehenge. |
| C．The process of building Stonehenge. |
Many people around the world may know that paper is one of the Four Great Inventions of ancient Chinese civilization,
Xuan paper was first made in ancient Xuan Prefecture, now
Xuan paper is highly water absorbent, making it a perfect medium for conveying artistic effect in both Chinese calligraphy and ink wash painting. In addition, Xuan paper
Today in Jingxian County, there
5 . While DNA from animal bones or teeth can cast light on an individual species, environmental DNA enabled scientists to build a picture of a whole ecosystem.
A core of ice age sediment (沉积物) from northern Greenland has yielded the world’s oldest sequences of DNA. The 2 million-year-old DNA samples revealed the now largely lifeless polar region was once home to rich plant and animal life — including elephant-like mammals known as mastodons (乳齿象), reindeer, hares, lemmings, geese, birch trees and poplars, according to new research published in the journal Nature on Wednesday.
The finding is the work of scientists in Denmark who were able to detect and restore environmental DNA — genetic material drop into the environment by all living organisms — in tiny amounts of sediment taken from the Copenhagen Formation, in the mouth of a strait in the Arctic Ocean in Greenland’s northernmost point, during a 2006 expedition.
They then compared the DNA pieces with libraries of DNA collected from both extinct and living animals, plants and microorganisms. The genetic material revealed dozens of other plants and creatures that had not been previously detected at the site based on what’s known from fossils and pollen records.
“The first thing that blew our mind when we’re looking at this data is obviously this mastodon and the presence of it that far north, which is quite far north of what we knew as its natural range,” said study co-author Mikkel Pedersen.
The mix of temperate (温带) and Arctic trees and animals suggested a previously unknown type of ecosystem that has no modern equivalent — one that could act as a genetic road map for how different species might adapt to a warmer climate, the researchers found.
Love Dalen, a professor at the Centre for Palaeogenetics at Stockholm University, said the finding “pushed the envelope” for the field of ancient DNA. “Also, the findings that several temperate species (such as relatives of spruce and mastodon) lived at such high latitudes are exceptionally interesting,” he added.
Further study of environmental DNA from this time period could help scientists understand how various organisms might adapt to climate change. “It’s a climate that we expect to face on Earth due to global warming and it gives us some idea of how nature will respond to increasing temperatures,” he explained.
1. What can we know about environmental DNA from the passage?| A．It makes it easier to understand individual species. |
| B．It is a collection of DNA from all kinds of living things. |
| C．It includes DNA of mammals living 2 million years ago. |
| D．It was first discovered in sediment from northern Greenland. |
| A．By looking at the data of mastodon. |
| B．By detecting DNA samples at the site. |
| C．By analyzing fossils and pollen records. |
| D．By comparing the newly-found DNA with existing ones. |
| A．broke the limit | B．laid a foundation |
| C．raised a new question | D．attracted wide attention |
| A．Northern Greenland faces species extinction |
| B．Oldest DNA reveals a solution to global warming |
| C．Northern Greenland faces increasing temperatures |
| D．Oldest DNA reveals a 2 million-year-old ecosystem |
6 . Four Historic American Theatres
Today, theatres remain a key part of a city’s lifeblood. The following are four historic theatres in America.
Pantages Theatre, Minneapolis, MN
The Pantages Theatre, which now seats 1,014, opened in 1916 as part of Alexander Pantages’s well-known group of theatres. It was designed by the local firm Kees and Colburn. In 1922, the theatres was rebuilt by Scottish theatres architect Benjamin Marcus Priteca. After going through several owners, in 1984, it was closed and remained unopened until 1996. Some theatre supporters had it repaired and improved, resulting in its reopening in 2002.
Saenger Theatre, New Orleans, LA
New Orleans’s Saenger Theatre was built two years before the Great Depression, in 1927, and cost a then unheard-of $ 2.5 million. It was designed by Emile Weil, featuring a 15th-century Florentine courtyard and gardens, and Greek and Roman statues. Although the theatre was destroyed by Hurricane Katrina in 2005, after a $ 53 million renovation (修葺), it reopened in 2013.
Thalian Hall, Wilmington, NC
Thalian Hall has been in almost continuous use since its opening in 1858. It is the only surviving theatre designed by John Montague Trimble, one of America’s foremost 19th-century theatre architects, and originally housed the town government, a library, as well as an “Opera House”, seating 1, 000 people. Some repairs in 1909 led to the removal of the side balconies and the installation of electric stage lights.
Providence Performing Arts Center, Providence, RI
It was originally opened as a movie palace in 1928, and the silent movies it showed were accompanied by a $ 90, 000 Robert Morton organ. After several decades, the theatre suffered from the increased popularity of television, as well as damage by two hurricanes. Over the past decade and a half, it has undergone extensive renovations and modernization.
1. What can we know about the Pantages Theatre?| A．It has a seating capacity of 1, 916. | B．It will be turned into a movie house. |
| C．It was designed by Alexander Pantages. | D．It was once shut down for over a decade. |
| A．Pantages Theatre. | B．Saenger Theatre. | C．Thalian Hall. | D．Providence Performing Arts Center |
| A．They went through major renovations. |
| B．They were hit by terrible natural disasters. |
| C．They were built by American theatre architects. |
| D．They belong o Alexander Pantages’s group of theatres. |
7 . Sometimes shipwrecks（沉船）contain sunken treasure, loads of gold or jewelry. Other shipwrecks are themselves the treasure—the stories of their ill-fated voyages creating a legend that makes them sparkle far more than any gold or precious stones.
The wreck of HMS Endurance, which has finally been located deep beneath the icy seas of Antarctica after being lost 107 years ago, was arguably the most valuable shipwreck ever sought. That’s because its discovery adds another thrilling new chapter to an already fascinating tale of perseverance and survival that has echoed down the decades and still inspires today.
Incredibly well preserved at a depth of almost two miles, the ship is little changed from the day in November 1914 when it finally sank beneath the ice. Endurance became embedded in ice while crossing Antarctica’s Weddell Sea. The video shot by underwater search vehicles shows painted timbers, an undamaged guardrail（护栏）and the name “Endurance” written above the five-pointed symbol of a polar star.
“I tell you, you would have to be made of stone not to feel a bit soft at the sight of that star and the name above,” Mensun Bound, the mission’s marine archaeologist, told the BBC. “You can see a porthole（舷窗）that is in Shackleton’s cabin. At that moment, you really do feel the breath of the great man upon the back of your neck.” Shackleton’s leadership was crucial to getting his men out alive. The reason why Shackleton is still applauded as a great man becomes obvious when you consider what he achieved in the face of disasters and hardships during his 1914-16 expedition. The practicality and humanity he showed in the face of severe situations was arguably praised.
1. What makes Endurance the most valuable shipwreck?| A．The treasure aboard. | B．Its inspiring stories. |
| C．Its undamaged guardrail. | D．The symbol of a polar star. |
| A．The floating ice is as hard as stones. |
| B．The well-preserved shipwreck is amazing. |
| C．The heroic deeds of Shackleton are touching. |
| D．The discovery of Endurance is challenging. |
| A．A book review. | B．A news report. |
| C．A biography. | D．A travel journal. |
