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题型:阅读理解-阅读单选 难度:0.65 引用次数:132 题号:21657821

Scientists have successfully recovered RNA, a form of genetic material, from the remains of the Tasmanian tiger, an extinct Australian animal. The discovery could help scientists learn more about these creatures before they disappeared from Earth.

The researchers extracted the recovered RNA from the skin and muscle of a Tasmanian tiger specimen (标本) stored in a Swedish museum since 1891. This is the first time RNA has been successfully recovered from an extinct animal. The Tasmanian tiger was once a top predator, known for hunting kangaroos and other animals. The last known Tasmanian tiger is believed to have died in a Tasmanian zoo in 1936. Emilio Mármol Sánchez, from the Centre for Palaeogenetics, led the study describing these research results. Sánchez believes that the recovered RNA material provides a glimpse into the true biology of the Tasmanian tiger, offering insights into the cells and tissues of these extinct creatures.

While Scientists have in recent years taken RNA from different ancient animals and plants, how long RNA could survive at room temperature has been a subject of debate among researchers. The well-preserved condition of the Tasmanian tiger remains, which were in a state of semi-mummification (半木乃伊化), suggests that RNA can survive for longer periods under certain conditions.

The Tasmanian tiger looked similar to a wolf, except for the tiger-like lines appearing on its back. When people arrived in Australia about 50,000 years ago, large animal population losses followed. The arrival of European colonizers in the 18th century destroyed the remaining populations around the island of Tasmania.

Private “de-extinction” programs have been launched with the aim of bringing back some extinct animals. These include the Tasmanian tiger, flightless dodo bird and wooly mammoth.

However, many researchers have warned about the difficulties of using genetic processes to actually recreate an extinct species. While Sánchez said he too has concerns about such processes, he noted that he does “advocate for more research on the biology of these extinct animals.”

1. What can be gained about Tasmanian tigers from the recovered RNA material?
A.The genetic makeup.B.The social behavior.
C.The preferred habitats.D.The migration patterns.
2. What may scientists strongly argue about regarding RNA?
A.Its close relationship to DNA.
B.Its recovery from an extinct animal.
C.Its survival time at room temperature.
D.Its life process under certain conditions.
3. What is Sánchez’s opinion on de-extinction programs?
A.He considers it impossible to recreate extinct species.
B.He opposes them and sees difficulties in the research.
C.He thinks they are promising but need more research.
D.He takes genetic preservation measures more seriously.
4. What is the best title for the passage?
A.The Challenges of Biological Research of Extinct Animals
B.The Potential Benefits from Tasmanian Tiger Remains
C.The Biological Secrets of the Extinct Tasmanian Tiger
D.The Recovery of RNA from Tasmanian Tiger Remains

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【推荐1】The Scientific Reason Why Your Dog Is Helping You Live Longer

Are you one of the 44 percent of Americans with a dog? You have a lot of things to thank your dog for, including getting a great night’s sleep. But as it turns out, man’s best friend isn’t just a great life companion; he (or she) can also help you live longer, according to new research.

A study published in the journal Scientific Reports gathered data on 3.4 million subjects aged 40 to 80, comparing them to Swedish registers of dog owners over an 11-year period. Overall, owners of dogs (especially hunting breeds) have a lower risk of death from cardiovascular(心血管) disease or other causes, the researchers found.

That even goes for people who live alone, which a previous study has found could shorten your life. Single dog owners were 33 percent less likely to die and 11 percent less likely to have a heart attack during the study period, compared to single non-owners.

According to the researchers, the benefits can go both ways: While dog ownership can encourage people to be more physically active, active people may also be more likely to own dogs. Owning a dog might also increase peoples’ social interaction and overall well-being, leading to a longer life. What’s more, a family dog could change the owner’s bacterial microbiome(细菌微生物群) by exposing them to foreign bacteria, which boosts their immune systems against disease. Find out more secrets your pet won’t tell you.

“Dog ownership has many benefits, and we may now be able to count better heart health as one of them,” Dr. Mike Knapton of the British Heart Foundation told the BBC. “However, as many dog owners may agree, the main reason for owning a dog is the sheer joy.”

1. What will probably allow people to enjoy a longer life?
A.Living alone without a dog.
B.Owning a dog.
C.Following the dog’s living ways.
D.Being single.
2. What does the underlined word boost mean?
A.influenceB.break
C.weakenD.strengthen
3. Which is NOT the benefit of owning a dog in the research?
A.Healthier immune system.
B.Longer life of the dogs and their owners.
C.More social interaction and well-being.
D.Lower risk of heart diseases.
4. In Dr. Mike Knapton’s opinion, many Americans raise dogs because the dogs can ______.
A.change their life style
B.better their heart condition
C.bring them a lot of fun
D.help them to live longer
2020-11-25更新 | 321次组卷
阅读理解-阅读单选(约320词) | 适中 (0.65)
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【推荐2】The endangered pandas in the Qinling Mountains might face a new threat: the loss of their food—bamboo, which makes up 99% of their meals.

Adult pandas spend most part of the day eating bamboo and have to take in at least 40 pounds a day to stay healthy. However, a new study published in Nature Climate Change warned that they may soon find their food gone because most of the bamboo in the Qinling Mountains might disappear by the end of the century as a result of the rising temperature worldwide.

A team made up of researchers from Michigan State University and the Chinese Academy of Sciences has studied the effects of climate change on the bamboo in the Qinling Mountains. They have found that bamboo is very sensitive to climate change. “80% to 100% of the bamboo would be gone if the average temperature increases 3.5 degrees worldwide by the end of the century,” said Liu Jianguo, one of the report’s authors.

He added, “This is how much the temperature would rise by 2100 even if all countries will keep their promises in The Paris Agreement. But you know what is happening around the world.”

In recent years, China has been trying its best to protect the endangered pandas by setting up more and bigger nature reserves.

“But it is far from being enough and the endangered pandas need cooperation from the rest of the world, because their future is not just in the hands of the Chinese,” said Shirley Martin from the World Wildlife Fund but not a member of the team.

There are about 260 pandas in the Qinling Mountains. That is about 13% of the China’s wild panda population. In addition, about 375 are living in research centers and zoos in China.

1. What can we learn from the first paragraph?
A.The Qinling Mountains can provide enough bamboo for the pandas.
B.Pandas in the Qinling Mountains are only threatened by the loss of food.
C.Lots of the bamboo in the Qinling Mountains will probably disappear.
D.Pandas have already eaten 99% of the bamboo in the Qinling Mountains.
2. What does Liu Jianguo mean?
A.China needs more help from the World Wildlife Fund.
B.It is difficult to control the temperature rise within 3.5℃.
C.Bamboo is sensitive to changes in temperature.
D.China is making great efforts to protect the pandas.
3. How many wild pandas are there in China?
A.About 260.B.About 635.
C.About 2, 635.D.About 2, 000.
4. Which can be the best title for the text?
A.The Disappearance of Bamboo
B.Necessity to Change Pandas’ Food
C.A New Threat Faced by the Pandas
D.Efforts Made to Save Pandas
2023-09-03更新 | 52次组卷
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文章大意:这是一篇说明文。文章主要介绍了历史上鸽子的作用和发展情况以及后来产生的问题。

【推荐3】In the 16th century, it was not unusual to see armed men standing guard outside Britain’s dovecotes (鸽舍). They were not there to protect the pigeons living inside, but rather to prevent thieves from breaking in and stealing something far more valuable—the birds’ waste.

Chemists in mid-1500s Nuremburg had discovered that the birds’ waste was a rich source of saltpetre, a vital ingredient in the making of gunpowder. As a consequence, for several decades pigeon droppings were almost as valuable as silver. Moreover, waste gathered from the dovecotes was a rich fertiliser, particularly sought after by those with vineyards and orchards (果园).

The dovecote was not only a source of food and revenue in medieval times, but also a status symbol. The privilege of building or owning dovecotes was reserved for the upper class. The right was granted by the king. Those who were allowed to build a dovecote usually placed it in some conspicuous places, so that passersby could behold it.

However, the abundance of dovecotes across the British countryside was not universally welcomed. Even a small dovecote had nesting holes for 500 birds. Each day they flew off to stuff themselves on other people’s crops. By the middle of the 17th century, the disaster of pigeons was so great that poet John Milton voiced his fears that the dangerous doves would turn England into a desert.

Later, vast quantities of natural saltpetre were discovered in Chile and California, destroying the value of pigeon waste as a chemical resource. Keeping pigeons was no longer necessary nor profitable, nor even fashionable. During the 18th and 19th centuries, around 95 per cent of Britain’s dovecotes fell into disuse and were demolished.

Now homeless, the tens of thousands pigeons that had once lived in the dovecotes flew off to find somewhere else to live. A species that in the wild had nested on cliffs, the birds discovered that Britain’s rapidly growing towns and cities were full of the sort of rock-faces they liked to root into—humans called them “buildings”. And so these once noble and attractive birds settled there. Over time they’d become the wild urban pigeons that we know today.

1. Which of the following is NOT pigeon’s function in the past?
A.Provide material for gunpowder.B.Improve the level of soil fertility.
C.Increase income by selling meat.D.Promote a man’s social position.
2. What does the underline word “conspicuous” in Paragraph 3 mean?
A.Face-saving.B.Hand-reaching.C.Eye-catching.D.Breath-taking.
3. Why does the author mention John Milton in Paragraph 4?
A.To emphasize the danger of land desertification.
B.To describe the destructive power of the pigeons.
C.To highlight the local’s deep hatred for pigeons.
D.To represent pigeon’s strong ability to reproduce.
4. Which of the following is the best title of the passage?
A.Pigeons: from Prosper to ProblemB.The Origin of Wild Urban Pigeon
C.Pros and Cons of Raising PigeonsD.The Glorious History of Pigeon
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