1 . Million-year-old mammoth genomes push the limits of a revolutionary technique
In the 1966 science-fiction movie “One Million Years B.C. ”, Raquel Welch and John Richardson traverse a primitive landscape inhabited by dinosaurs and early humans. The film was low on science and high on
A more
The team’s work represents a new
The trouble with DNA is that it breaks down after death. The more brokendown it is, the
Samples were sent to Dr Dalen’s laboratory in 2017 and strands of DNA were extracted, sequenced, and dated. Whereas DNA samples from a living animal can run to several hundreds of thousands of letters, the timeworn mammoth samples
To date a specimen, fragments of its DNA are compared to corresponding chunks from
The teeth held other
A.novel | B.fiction | C.drama | D.research |
A.urgent | B.descriptive | C.particular | D.accurate |
A.record | B.term | C.admission | D.pioneer |
A.Revealed | B.Extracted | C.Enrolled | D.Injected |
A.popular | B.punctual | C.invaluable | D.realistic |
A.related | B.concerned | C.critical | D.silent |
A.harder | B.quicker | C.stronger | D.lower |
A.equivalent | B.comparison | C.variation | D.messenger |
A.moreover | B.therefore | C.however | D.meanwhile |
A.mined | B.yielded | C.overestimated | D.recited |
A.destination | B.location | C.limit | D.permit |
A.precious | B.lost | C.rotten | D.known |
A.manual | B.just | C.imperial | D.previous |
A.surprises | B.miracles | C.imaginations | D.alternatives |
A.suddenly | B.permanently | C.slowly | D.accidentally |
2 . When Mexican scientist of the evolution of animal behavior, Laura Cuaya, moved to Hungary for her postdoctoral studies in Budapest, she brought her pet dog, Kun-kun, along for the ride. Cuaya couldn't help noticing how locals warmed to dogs. This prompted her naturally curious scientific mind to start asking questions. “Here people are talking all the time to Kun-kun, but I always wonder if Kun-kun can recognize that people in Budapest speak Hungarian, not Spanish?” So she set out to find an answer through a scientific study.
Cuaya and her colleagues decided to use brain images from MRI scanning to shed light on her hunch. They worked with dogs of various ages that had, until the experiment, only heard their owners speak just one of the two languages, Spanish or Hungarian. Not surprisingly, getting the dogs to happily take part in the experiment took some creative coaxing and animal training! The researchers first needed to teach Kun-kun and her 17 fellow participating dogs including a labradoodle, a golden retriever and Australian shepherds, to lie still in a brain scanner. Their pet parents were always present, and they could leave the scanner at any point.
The research team played children's book classic The Little Prince in both Spanish and Hungarian while scanning the dogs' brains with an MRI machine. They were looking for evidence that their brains reacted differently to a familiar and unfamiliar language. The researchers also played scrambled versions of the story to find out if dogs could distinguish between speech and non-speech.
The images reveal that dogs' brains show different patterns of activity for an unfamiliar language than for a familiar one — the first time anyone has proved, researchers say, that a non-human brain can distinguish between two languages. This means that the sounds and rhythms of a familiar language are accessible to non-humans.
Interestingly, the team also found that the brains of older dogs were more skilled at detecting speech “suggesting a role for the amount of language exposure”. They suggest that dogs have refined their ability to distinguish between human languages over the long process of domestication.
1. What is paragraph 1 mainly about?A.The background of the study. | B.The significance of the study. |
C.The concern of the researcher. | D.The introduction to the researcher. |
A.Age limits. | B.Brain patterns. | C.Language exposure. | D.Owners' commands. |
A.practical | B.contradictory | C.compromising | D.groundbreaking |
A.Dogs Can Tell Foreign Languages | B.Dog Brains Have Different Patterns |
C.Old Dogs Know More About Human Speech | D.Dogs Can Differ Speech From Non-Speech |
3 . Last week came solid evidence that living in toxic Britain can seriously harm your health. Cardiologists at Queen Mary University of London found that even "safe" levels of air pollution are linked to heart abnormalities similar to those seen during the early stages of heart failure. Their study of almost 4,000 people was backed up by a major US study which showed that higher exposure to fine particles and nitrogen oxides is linked to an acceleration in the hardening of the arteries (动脉).
We have long known that air pollution leads to coughing, shortness of breath and irritation in the eyes, nose and throat. It is also clearly linked to respiratory diseases such as asthma and bronchitis, as well as diabetes and some cancers. It is now beyond doubt that children's health is greatly affected, and links have been made between it and Parkinson's, Alzheimer's, dementia and congenital birth defects.
The statistics are alarming. In the UK, more than 2 million people suffer from cardiovascular (心血管的) diseases, and nearly one in seven men and one in 12 women will go on to die from them. Heart disease costs the UK economy nearly £30 bn a year to treat, as much as the state spends on secondary education. It is one of the greatest single drains on the public purse. Britain, however, rejects common sense, and shows little sign that it wants to seriously address pollution any time soon.
Despite the mounting evidence of air pollution's costs and health impact, Britain has had to be dragged screaming through the courts to make it comply with minimal clean air guidelines and laws. Successive governments have continually tried to evade their legal responsibilities, spending millions of pounds fighting in the courts and lobbying the EU to be allowed to continue to pollute.
The government now has a new draft clean air strategy our for consultation until 14 August and claims to be acting faster to tackle air pollution than almost every other major developed economy. It pledges to halve the number of people living in places that do not meet World Health Organization pollution guidelines, and it propose to end the sale of new diesel and petrol cars and vans by 2040.
But intending to cut the air pollution bill by around 12.5% in 12 years and waiting 20 years to be rid of the worst vehicles seems criminally weak. Meanwhile, government is knowingly forging ahead with infrastructure plans that will inevitably increase air pollution. The effect will inevitably be to massively increase air pollution and health costs for millions of Britons.
So could the car-clogged streets of Sunder-land, Birmingham and London, where I lived for many years, have contributed to my disease and those of millions of others? Probably. Could the oil companies be responsible for far more than climate change? Certainly. Could Britain's monstrous and mounting bill for heart disease be partly due to the highly polluting diesel cars that governments so scandalously encouraged us to drive? Quite possibly.
What is certain is that air pollution is now an international scandal, and the cause of a health emergency that governments and industry have failed to address. It undoubtedly threatens life more than any war or disaster. When there are clear alternatives to burning fossil fuels then politicians who do not act to prevent it must stand accused not just of failing to act, but of condoning the mass poisoning of their people.
1. According to the study, ________ is probably unrelated to air pollution.A.diabetes | B.stomachaches | C.Alzheimer | D.artery hardening |
A.British government has been screaming for help in court |
B.EU has dissuaded British government for help in court |
C.British government has tried to have EU's permission for more pollution |
D.The government firmly refused to act in accordance with the clean air guideline. |
A.Britain will implement it faster than other major developed economies. |
B.It presents a practical way to end pollution from vehicles. |
C.Its goal will be achieved at the price of massive health cost. |
D.It's aiming too low when more pollution is expected. |
A.Government officials should feel disgraced for non-action as leaders. |
B.The government should cover the bills for air pollution and related diseases. |
C.Oil companies should not be held accountable for the international scandal. |
D.British government is an irresponsible one for encouraging people to use vehicles. |
A. stem B. dot C. attributable D. exceeded E. overlook F. exposed G. drainage H. emerging I. sinking J. access K. established |
The Mega-City Environment
Mega-cities suffer from a catalog of environmental ills. A World Health Organization(WHO)/United Nations Environment Program(UNEP)study found that seven of the cities-Mexico City, Beijing, Cairo, Jakarta, Los Angeles, Sao Paulo and Moscow-had three or more pollutants that
According to the World Resources Institute, “Millions of children living in the world’s largest cities, particularly in developing countries, are
Almost all of the mega-cities face major fresh water challenges. Johannesburg, South Africa, is forced to draw water from highlands 370 miles away. In Bangkok, saltwater is invading aquifers(地下蓄水层). Mexico City has a serious
More than a billion people, 20 percent of the world’s population, live without regular
Mega-city residents, crowded into unsanitary slums, are also subject to serious disease outbreaks. Lima, Peru(with population estimated at 9.4 million by 2015)suffered a cholera outbreak in the late 1990s partly because, as the New York Times reported, ”rural people new to Lima...live in houses without running water and use the outhouses(屋外厕所)that
It’s worth looking at some of these
请根据下图用英语写一篇短文。你的短文应包括下列要点:
1.简要描写图画内容;
2.这一现象产生的原因;
3.发表你对解决此类问题的看法。
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6 . The UN this week launched a report urging companies to stop issuing false net-zero targets that amount to greenwashing.
Greenwashing is a term used to describe situations where companies mislead consumers by claiming to be eco-friendly or sustainable as a marketing plan rather than as a core principle of their business model. Often, these industries spend more money making themselves appear sustainable than they do taking actual sustainable measures into their company.
Cities, financial institutions, and scores of companies have announced plans to reduce their emissions to zero, which, in principle, should help the fight against climate change.
“The problem is that the criteria for these net-zero commitments have varying levels of precision and loopholes (漏洞),” said UN Secretary-General Antonio Guterres during the launch of the report.
Many net-zero plans contain far-away or unclear targets and often call for the use of unproved technologies like carbon capture and tree planting, which effectively allow companies to continue polluting the atmosphere. Studies show that most of these net-zero plans will do little to stop temperatures from rising. For example, many oil majors have announced plans to reduce emissions from their operations to zero by 2050 that do not take into account the carbon emitted by the fossil fuels they sell, which would allow them to increase production. Far from decreasing, fossil fuel production is going strong.
To close these net-zero loopholes, the UN this week released a report that includes 10 recommendations to ensure that companies, cities, regions, and other non-state actors issue credible and accountable net zero commitments. “Their plans cannot rely on cheap carbon credits instead of immediately cutting their own emissions,” Guterres said.
Financial institutions need to cut down emissions from all their investments and businesses need to bring down the carbon footprint of their supply chain, the report said. The report’s lead author, Catherine McKenna, urged companies to release new net-zero targets within a year. The updated targets must contain concrete actionable details.
1. What does “greenwashing” refer to?A.A green technology. | B.A misleading statement. |
C.A business model. | D.A spending target. |
A.To prove oil majors are really responsible. |
B.To set some good examples for other companies. |
C.To show some net- zero commitments make no sense. |
D.To indicate the benefit of net zero plans to climate change. |
A.Dissatisfied. | B.Guilty. | C.Shocked. | D.Confused. |
A.Plant more trees. | B.Share more supply chains. |
C.Depend on cheap carbon credits. | D.Make concrete actionable targets. |
7 . The part of the environmental movement that draws my firm’s attention is the design of buildings. Today, thousands of people come to
Home builders can now use materials, such as green paints, that release significantly
Look at it this way: no one
A.commercial | B.green | C.traditional | D.simple |
A.efficient | B.changeable | C.influential | D.effective |
A.relevant | B.indoor | C.flexible | D.forward |
A.revealed | B.displayed | C.exhibited | D.discovered |
A.careful | B.comfortable | C.stable | D.safe |
A.reduced | B.revised | C.delayed | D.defined |
A.destroy | B.deny | C.dissolve | D.depress |
A.Anyway | B.Besides | C.Anyhow | D.However |
A.exactly | B.completely | C.partially | D.superficially |
A.restored | B.regain | C.reused | D.retain |
A.developed | B.stretched | C.researched | D.constructed |
A.sets off | B.sets about | C.sets out | D.sets up |
A.instead | B.because | C.out | D.regardless |
A.adjusting | B.adopting | C.adapting | D.admitting |
A.functional | B.sensible | C.beneficial | D.precious |
8 . Many people learn at an early age to associate the color red with danger. So might it make sense to print medication
“People are not
The researchers found that when the screen was red, subjects performed better on detail-oriented tasks. In one test,
In other tests, creative abilities seemed to be
Researchers concluded from the tests that seeing red causes people to take the extra time to think
A.instructions | B.symptoms | C.warnings | D.treatments |
A.create | B.relax | C.decorate | D.design |
A.skies | B.medication | C.colors | D.paint |
A.danger | B.detail | C.emotions | D.vigor |
A.distracted by | B.aware of | C.content with | D.curious about |
A.cognitive | B.intelligence | C.mental | D.memory |
A.on one hand | B.at the same time | C.for example | D.that is |
A.grey | B.blue | C.green | D.white |
A.proven | B.acquired | C.recognized | D.enhanced |
A.more abstract | B.more positive | C.more innovative | D.more valuable |
A.practical | B.academic | C.economical | D.profitable |
A.critically | B.logically | C.carefully | D.independently |
A.painting | B.memorizing | C.designing | D.brainstorming |
A.Unless | B.When | C.Since | D.Though |
A.turn up | B.stir up | C.set off | D.give off |
9 . More than a score of Australian rare mammals have been killed by wild cats. These predators, which arrived with European settlers, still threaten native wildlife — and are too plentiful on the mainland to eliminate, as has been achieved on some small islands which were previously filled with them. But Alexandra Ross of the University of New South Wales thinks she has come up with a different way to deal with the problem. As she writes in a paper in the Journal of Applied Ecology, she is giving feline (猫科的) — awareness lessons to wild animals involved in re-introduction programs, in order to try to make them cat-conscious.
Many Australian mammals, though not actually extinct, are restricted to fragments of cat-free habitat. This will, however, put the forced migrants back in the sights of the cats that caused the problem in the first place. Training the migrants while they are in captivity, using stuffed models and the sorts of sounds made by cats, has proved expensive and ineffective. Ms Ross therefore wondered whether putting them in large natural enclosures with a scattering of predators might serve as a form of training camp to prepare them for introduction into their new, cat-ridden homes.
She tested this idea on a type of bandicoot (袋狸) that superficially resembles a rabbit. She and her colleagues raised two hundred bandicoots in a huge enclosure that also contained five wild cats. As a control, she raised a nearly identical population in a similar enclosure without the cats. She left the animals to get on with life for two years, which, given that bandicoots breed four times a year and live for around eight years, was a considerable period for them. After some predation (扑食) and probably some learning, she abstracted 21 bandicoots from each enclosure, attached radio transmitters to them and released them into a third enclosure that had ten hungry cats in it. She then monitored what happened next. The outcome was that the training worked. Over the subsequent 40 days, ten of the untrained animals were eaten by cats, but only four of the trained ones. One particular behavioral difference she noticed was that bandicoots brought up in a predator-free environment were much more likely to sleep alone than were those brought up around cats. And when cats are around, sleeping alone is dangerous. How well bandicoots that have undergone this extreme training will survive in the wild remains to be seen. But Ms Ross has at least provided reason for hope.
1. What can be learned from the first paragraph?A.The feline-awareness lessons have proved ineffective. |
B.There are too many wild cats to be killed in Australia. |
C.Different ways have been tried to hunt and kill wildlife. |
D.Native wildlife has been threatened by a growing population of wild cats. |
A.Australian mammals restricted to certain areas |
B.The wild cats tracking down the mammals |
C.Wild animals involved in the program |
D.The predators captured by the animal trainers |
A.They were both closely monitored. | B.They had 200 bandicoots in total. |
C.They had similar natural environment. | D.They both had wild cats in them. |
A.Untrained bandicoots failed to identify cats. |
B.Training bandicoots prepared them to fight cats. |
C.Sleeping alone in the wild was dangerous. |
D.Bandicoots could be trained to avoid predators. |
10 . The world is wasting the opportunity to “build back better” from the Covid-19 pandemic, and faces disastrous temperature rises of at least 2.7°C if countries fail to strengthen their climate commitments, according to a report from the UN.
Tuesday’s publication warns that countries’ current commitments would reduce carbon by only about 7.5% by 2030, far less than the 45% cut, which scientists say is needed to limit global temperature rises to 1.5℃, the aim of the Cop26summit that opens in Glasgow this Sunday.
António Guterres, the UN secretary-general, described the findings as a “thundering wake-up call“ to world leaders. while experts called for action against fossil fuel companies.
Although more than 100 countries have promised to reach net zero emissions around mid-century, this would not be enough to avoid climate disasters, according to the UN emissions report, which examines the shortfall between countries’ intentions and actions needed on the climate. Many of the net zero commitments were found to be unclear, and unless accompanied by strict cuts in emissions this decade would allow global heating of a potentially disastrous extent.
Guterres said: “The heat is on, and as the contents of the report show, the leadership we need is off. Far off. Countries are wasting a massive opportunity to invest Covid-19 finance and recovery resources in sustainable, cost-saving, planet-saving ways. As world leaders prepare for Cop26, this report is another thundering wake-up call. How many do we need?”
Inger Andersen, the director of the UN Environment Programme (UNEP) said: “Climate change is no longer a future problem. It is a now problem. To stand a chance of limiting global warming to 1.5℃, we have 8 years to almost halve greenhouse gas emissions: 8 years to make the plans, put in place the policies, carry them out and deliver the cuts.The clock is ticking loudly.”
Emissions fell by about 5.4% last year during Covid lockdowns, the report found, but only about one-fifth of the economic recovery spending goes towards reducing carbon emissions. This failure to ”build back better“ despite promises by governments around the world cast doubt on the world’s willingness to make the economic shift necessary to settle the climate crisis, the UN said.
In the run-up to Cop26, countries were supposed to submit national plans to cut emissions - called nationally determined contributions (NDCs) - for the next decade, a requirement under the 2015 Paris climate agreement. But the UNEP report found only half of countries had submitted new NDCs, and some governments had presented weak plans.
1. Why were the findings described as a “thundering wake-up call” in Para. 3?A.Because the world has failed to deliver on its current promises. |
B.Because the serious problems were brought about by global fossil fuels. |
C.Because a global temperature rise of at least 2.7°C would be a disaster. |
D.Because the opportunities presented by covid-19 have been wasted. |
A.New plans will be made to protect the environment. |
B.Measures will be taken to reduce emissions in the coming ten years. |
C.Transitions will be made in response to the global climate crisis. |
D.Global sustainable environmental resources will be greatly developed. |
A.To show the number of alarm clocks required. |
B.To inquire the number of the countries attending the meeting. |
C.To explain the reason for the world’s wasting chances. |
D.To stress the need to save energy and reduce emissions. |
A.Few countries have submitted plans to reduce the emissions. |
B.Most of the countries work under the Paris Climate Agreement. |
C.Plans to cut emissions of many countries are far from satisfactory. |
D.Much progress in reducing emissions has been made these years. |