The Oxford English Dictionary, or OED for short, is one of the
The sheepskin raft (羊皮筏), the oldest means of transportation along the Yellow River, has
It is said that the largest sheepskin raft in old times
In the early 20th century, before the 1950s,
However, with the rapid development of society, the sheepskin raft has
The Grand Canal is the longest and
The Grand Canal is an essential technological achievement
Chinese book culture has a long history. Its roots can be traced back thousands of years, to the earliest known
The first major development in Chinese book culture was the invention of woodblock printing by Bi Sheng in the 11th century. This revolutionized book production, making it much
In modern times, new genres such as science fiction and fantasy have grown in
With its rich history and diverse genres, Chinese book culture provides a window into Chinese society. From ancient classics to modern bestsellers, Chinese books can open up
1. When was the first real newspaper started?
A.In 1609. | B.In 1665. | C.In 1704. |
A.Germany. | B.England. | C.America. |
A.Strassburg Relation. | B.The New York Sun. | C.The Boston News-Letter. |
A.It only cost a dollar. |
B.It was called The London Gazette. |
C.It was the first one to have advertisements. |
Against a backdrop of misty green forests and with its buildings on stilts (桩) above the River Tuo, Fenghuang is a picturesque place to spend a day or two. Its winding allays, lined
Although the town can get
Fenghuang itself does have a section of rebuilt Ming city walls
The Maritime Silk Road Museum of Guangdong (MSRMG) in Yangjiang, South China’s Guangdong Province, is China’s first museum to focus
“Unlike many other Chinese museums that contain
Ye Daoyang, the deputy director of MSRMG’s Underwater Archaeology and Technology Department, said that the Nanhai I will
Apart from the ship itself, the museum is home to many china
“The entire body of the Nanhai I
8 . 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 |
1. What is the woman interested in seeing?
A.An exhibition of paintings. |
B.A Broadway play. |
C.An opera. |
A.In the early 18th century. |
B.In the early 20th century. |
C.In the late 19th century. |
A.Fascinating. | B.Huge. | C.Popular |
1. What is the date today?
A.October 22nd. | B.October 23rd. | C.October 24th. |
A.80 years old. | B.75 years old. | C.45 years old. |