1 . Endangered polar bears are breeding (繁殖) with grizzly bears (灰熊), creating “pizzly” bears, which is being driven by climate change, scientists say.
As the world warms and Arctic sea ice thins, starving polar bears are being forced ever further south, where they meet grizzlies, whose ranges are expanding northwards. And with that growing contact between the two come increasing hybrids (杂交种).
With characteristics that could give the hybrids an advantage in warming northern habitats, some scientists guess that they could be here to stay. “Usually, hybrids aren’t better suited to their environments than their parents, but these hybrids are able to search for a broader range of food sources,” Larisa DeSantis, an associate professor of biological sciences at Vanderbilt University, told Live Science.
The rise of “pizzly” bears appears with polar bears’ decline: their numbers are estimated to decrease by more than 30% in the next 30 years. This sudden fall is linked partly to “pizzly” bears taking up polar bears’ ranges, where they outcompete them, but also to polar bears’ highly specialized diets.
“Polar bears mainly consumed soft foods even during the Medieval Warm Period, a previous period of rapid warming,” DeSantis said, referring to fat meals such as seals. “Although all of these starving polar bears are trying to find alternative food sources, like seabird eggs, it could be a tipping point for their survival.” Actually, the calories they gain from these sources do not balance out those they burn from searching for them. This could result in a habitat ready for the hybrids to move in and take over, leading to a loss in biodiversity if polar bears are replaced.
“We’re having massive impacts with climate change on species,” DeSantis said. “The polar bear is telling us how bad things are. In some sense, “pizzly” bears could be a sad but necessary compromise given current warming trends.”
1. Why do polar bears move further south?| A．To create hybrids. | B．To expand territory. |
| C．To relieve hunger. | D．To contact grizzlies. |
| A．Broader habitats. | B．More food options. |
| C．Climate preference. | D．Improved breeding ability. |
| A．A rare chance. | B．A critical stage. |
| C．A positive factor. | D．A constant change. |
| A．Polar bears are changing diets for climate change. |
| B．Polar bears have already adjusted to climate change. |
| C．“Pizzly” bears are on the rise because of global warming. |
| D．“Pizzly”bears have replaced polar bears for global warming. |
2 . For people suffering from depression, there’s an all-natural treatment they should use — getting more exercise. It could help fight depression, even if people have a genetic risk, new research shows.
For the study, researchers collected information from nearly 8,000 people and found those with related genes were more likely to have depression over the next two years after examining them. But that was less likely for people who were more active at the study’s start, even if they had a family history of depression. Higher levels of physical activity helped protect even those with the highest genetic risk of depression.
Both high-intensity (高强度) exercise and low-intensity activities were associated with a reduced risk of depression. Adding four hours of exercise a week could lower the risk of a new episode (一段经历) of depression by 17%, according to the study. “Our findings strongly suggest that, when it comes to depression, being physically active has the potential to remove the added risk of future episodes in individuals who are genetically risky,” said lead author Karmel Choi. “On average, about 35 additional minutes of physical activity each day may help people to reduce their risk and protect against future depression episodes.”
Depression is a common mental illness globally, with more than 264 million people affected. “Depression is so ubiquitous, and that underlines the need for effective approaches that can impact as many people as possible,” Choi said. And mental health and primary care providers can use the findings to advise patients that there’s something meaningful they can do to lower their risk of depression.
1. How did the researchers reach their conclusion?| A．By analyzing a mass of data. |
| B．By conducting genetic research. |
| C．By comparing various levels of activity. |
| D．By tracking the subjects for many years. |
| A．Physical activity betters medical treatment. |
| B．Exercise is able to decrease and prevent it. |
| C．Different levels of exercise intensity matter the same. |
| D．Exercising 35 minutes daily is the most effective treatment. |
| A．Harmful. | B．Complex. |
| C．Unusual. | D．Common. |
| A．To discuss a disease. |
| B．To introduce a method. |
| C．To analyze a genetic risk. |
| D．To explain a phenomenon. |
3 . Today, people use the Internet to shop, play games, make friends and read the news. Many young people can’t imagine life without it.
In 1957, the United States was in the middle of the Cold War. The Soviet Union (苏联) had sent up the first satellite (卫星), named Sputnik, into space. This meant the Soviets were ahead of the U. S. in technology. Americans were afraid.
The biggest change in the way that people use the Internet came in 1992. For the first time, the Internet was opened to the general public, creating what is now known as the World Wide Web.
| A．The network took more than ten years to develop. |
| B．Soon, people began finding all kinds of different things they could do on the Internet. |
| C．Most older people, on the other hand, think the Internet is only 10 or 15 years old. |
| D．People began to be fond of the Internet. |
| E．They didn’t know what to do. |
| F．The Internet then became available to colleges all over the United States and to scientists across Europe. |
| G．Scientists in the army of America started developing ideas for protecting the country. |
4 . Atomic shapes are so simple that they can’t be broken down any further. Mathematicians are trying to turn to artificial intelligence (AI) for help to build a periodic table of these shapes, hoping it will assist in finding yet-unknown atomic shapes.
Tom Coates at Imperial College London and his colleagues are working to classify atomic shapes known as Fano varieties, which are so simple that they can’t be broken down into smaller components. Just as chemists arranged element s in the periodic table by their atomic weight and group to reveal new insights, the researchers hope that organizing these atomic shapes by their various properties will help in understanding them.
The team has given each atomic shape a sequence of numbers based on its features such as the number of holes it has or the extent to which it bends around itself. This acts as a bar code (条形码) to identify it. Coates and his colleagues have now created an AI that can predict certain properties of these shapes from their bar code numbers alone, with an accuracy of 98 percent.
The team member Alexander Kasprzyk at the University of Nottingham, UK, says that the AI has let the team organize atomic shapes in a way that begins to follow the periodic table, so that when you read from left to right, or up and down, there seem to be general patterns in the geometry (几何) of the shapes.
Graham Nib lo at the University of Southampton, UK, stresses that humans will still need to understand the results provided by AI and create proofs of these ideas. “AI has definitely got unbelievable abilities. But in the same way that telescopes (望远镜) don’t put astronomers out of work, AI doesn’t put mathematicians out of work,” he says. “It just gives us new backing that allows us to explore parts of the mathematical landscape that are out of reach.”
The team hopes to improve the model to the point where missing spaces in its periodic table could point to the existence of unknown shapes.
1. What is the purpose of building a periodic table of shapes?| A．To gain deeper insights into the atomic shapes. |
| B．To create an AI to predict the unknown shapes. |
| C．To break down atomic shapes into smaller parts. |
| D．To arrange chemical elements in the periodic table. |
| A．Its holes. | B．Its bends. |
| C．Its atomic weight. | D．Its properties. |
| A．Design. | B．Help. | C．Duty. | D．Threat. |
| A．Thanks to AI, new atomic shapes have been discovered. |
| B．Mathematicians turn to AI to create more atomic shapes. |
| C．AI helps build a relationship between chemistry and maths. |
| D．A periodic table of shapes can be built with the help of AI. |
5 . China is one of the world’s ancient civilizations and has the earliest outstanding bronze casting technology. Here we’ve created a list of 4 museums where you can gain an in-depth understanding of Chinese bronze.
Sanxingdui Museum
Address: Sanxingdui Ruin Site, 133 Xian Road, Guanghan, Deyang, Sichuan province
Hours: Comprehensive Gallery (the first exhibition hall): 8:30-18:00; Bronze Gallery (the second exhibition hall): 8:30-18:30. Last tickets sold at 17:00. Closed on the morning of Chinese New Year’s Eve
Ticket booking: 0838-5651526
General admission: Gallery ticket 80 yuan
Note: Children shorter than 1.2m (including 1.2m) can visit the gallery free of charge. The ticket must be used on the day it is sold and authorizes one visit to each gallery.
National Museum of China
Address: East side of Tian’anmen Square, Dongcheng district, Beijing
Hours: 8:30-17:00 (no entry after 16:30)
General admission: Free (passport required for entry), Closed Mondays (except for national holidays)
E-mail: webmaster@chnmuseum.cn
Shanghai Museum
Address: 201 Renmin Avenue, Huangpu district, Shanghai
Hours: 9:00-17:00 (no entry after 16:00), Closed Mondays (except for national holidays)
E-mail: webmaster@shanghai-museum.org
General admission: free (a max of 8, 000 admitted daily)
Hunan Museum
Address: 50 Dongfeng Road, Changsha, Hunan province
Hours: 9:00-17:00 (no entry after 16:00), Closed Mondays (except for national holidays) and the eve of Chinese New Year
Tel: (+86-731) 8415833, 84475933
E-mail: web@hnmuseum.com
General admission: Free (passport required for entry)
1. Which museum should you choose for your family to visit next Monday?| A．Sanxingdui Museum | B．Hunan Museum |
| C．Shanghai Museum | D．National Museum of China |
| A．They are all free of charge. | B．They all set a deadline for entry. |
| C．They all lie in the south of China. | D．They can all be available through E-mail. |
| A．Science | B．Today’s News | C．Entertainment | D．History and Culture |
6 . Walking in the city is very different from walking in the park. A small psychology study suggests urban(城市的) environments can slow your step and possibly increase your mental load. A walk through nature, on the other hand, appears to ease your mind and quicken your pace. The findings show that natural settings may potentially reduce cognitive (认知的)tiredness and improve reaction times straight away. The study, which includes two experiments with two different approaches, was conducted among 65 university students in the lab.
The first of the two experiments in the new study focused on people’s way of walking and cognitive load. During this trial, participants were fitted with sensors and a dozen motion control cameras were set up to watch them repeatedly walk down a 15-metre room at their natural speed. The wall opposite them showed an image of either a nature scene or a city scene. After each walk, participants were asked to rate their feelings of discomfort in the visual environment. On the whole, when walking in city settings, people reported more discomfort and they walked at a slower pace, indicating a higher cognitive load.
The second experiment dug into some of the higher-level cognitive processes that might be at play. In the trial, participants were asked to distinguish between basic visual shapes on the computer while also in the presence of a natural or urban image(the same ones from the first experiment). Measuring reaction times in both natural and urban settings, the team found results to support their idea. In urban environments, participants were slower in distinguishing between simple shapes. The authors think this is because urban environments are more distracting(令人分心的) for our brains and take longer to process, but more research is needed to prove that idea.
1. How were the experiments conducted mainly?| A．By comparing. | B．By giving data. |
| C．By giving examples. | D．By explaining facts. |
| A．It can make us feel relaxed and react quickly. | B．It can activate our thinking and speed up our step. |
| C．It can make us less tired and improve our memory. | D．It can make us become more focused and creative. |
| A．They had a lower cognitive load. | B．They had to slow down their pace. |
| C．They couldn’t concentrate properly. | D．They felt uncomfortable after walking. |
| A．Urban environment makes us more concentrated. | B．People’s feelings are decided by their pace of walking. |
| C．The result of the experiments is widely appreciated. | D．People tend to get tired more easily walking in the city. |
7 . Vehicles on our roads are now mostly petrol and diesel (柴油) cars, but their days cannot continue for much longer. A recent university study found that current electric cars could be used for 87 percent of daily car journeys in the US. That figure could rise to 98 percent by 2020.
One hurdle to the widespread adoption of electric cars has been “range anxiety” — drivers concerns about running out of electricity on a journey. While petrol stations are conveniently located across national road systems, the necessary network of electric charging stations is still being developed. That said, charging points are becoming increasingly common throughout the USA.
Attitudes towards electric vehicles have changed greatly over the last few years. Not that long ago, electric cars were met with distrust, and their high prices drove customers away. Thanks to improvements in battery capacity, recharging times, performance and price, the current generation of electric cars are starting to persuade picky consumers. Plug-in cars will soon give internal combustion engine (内燃机) models a run for their money.
As well as development on the road, electric vehicles are taking to the seas and skies. Electric boats are among the oldest methods of electric travel, having enjoyed several decades of popularity from the late 19th to the early 20th century before petrol-powered outboard motors took over. Now, the global drive for renewable energy sources is bringing electric boats back. Steps towards electric air travel are also being made, with Airbus and NASA among the organizations developing and testing battery-powered planes. The experiments could soon make commercial electric flight a reality.
Electric vehicles do not produce any emissions (排放). If the US could replace 87 percent of its cars with electric vehicles, it would reduce the national demand for petrol by 61 percent. However, because of the production processes and the generation of electricity required to charge these vehicles, they cannot claim (声称) to be completely emission-free. That said, as many countries continue to increase their use of renewable energy sources, electric vehicles will become even cleaner.
1. The underlined word “hurdle” in Paragraph 2 probably means________.| A．aim | B．difficulty | C．result | D．step |
| A．They were very poorly made. | B．They were not widely promoted. |
| C．They were expensive. | D．They couldn’t travel at a high speed. |
| A．To introduce the history of electric travel. |
| B．To explain why the world needs more electric cars. |
| C．To show why more people have interest in electric cars. |
| D．To describe different ways electric vehicles can be used. |
| A．Driving into a Cleaner Future | B．History of Electric Cars |
| C．Problems with Petrol and Diesel Cars | D．Best Means of Transportation |
8 . As newer, more advanced technologies come out, huge amounts of electronics (电子产品) are thrown away, instead of being reused. These goods often end up in landfills, where the chemicals inside them may be a danger to the environment. Electronics can contain harmful materials. If these materials get into the ground or water, the pollution can cause serious problems. Most electronics require metals. These metals must be mined from the Earth. Often the mining process creates serious pollution.
A group known as Waste Electrical and Electronic Equipment (WEEE) Forum is trying to make people more aware of the problems of e-waste. Recently, the WEEE Forum asked researchers from the United Nations (UN) to study a kind of e-waste that’s often not noticed because people don’t consider the goods to be electronics. The WEEE Forum calls this kind “unable-to-be-seen” e-waste.
The UN study shows that about 1/6 of all e-waste is “unable-to-be-seen”. Though it’s “unable-to-be-seen”, it’s certainly not a small amount. The “unable-to-be-seen” e-waste weighs about 9 billion kilograms. The WEEE Forum says that if this e-waste were put into 40-ton trucks and the trucks were then lined up, the line of trucks would be about 5,630 kilometers long.
The surprising kind leading the “unable-to-be-seen” e-waste group was toys. Worldwide, roughly 7.3 billion electronic toys are thrown away each year. These include goods like car racing sets, electric trains, and musical toys. They also include toys with electronic parts, like dolls that speak or games with electronic timers. In all, toys make up about 35% of “unable-to-be-seen” e-waste. But the problem is far larger than just toys. The report also shows that other everyday goods like home alarms, smoke alarms, power tools, and computer cables (电缆) are also big sources of “unable-to-be-seen” e-waste.
The WEEE Forum is hoping that as more people and governments become aware of e-waste, they will make a much greater effort to make sure electronics get reused.
1. What is paragraph 1 mainly about?| A．The amount of electronics. | B．The development of electronics. |
| C．The ways of reusing electronics. | D．The pollution of electronics. |
| A．People’s interest in electronics’ character. |
| B．People’s impression on electronics’ package. |
| C．People’s misunderstanding of electronics. |
| D．People’s struggle to adapt to electronics. |
| A．By showing numbers. | B．By providing examples. |
| C．By making a summary. | D．By making a comparison, |
| A．Designing advanced electronics. | B．Making electronics get reused. |
| C．Stopping giving away electronics. | D．Reducing electronics’ production. |
9 . London and Paris are two of Europe’s biggest tourist destinations, just a few hours away from each other by road or rail and an hour’s distance by air. What about the train-ferry combination that many recall fondly from their childhoods? Well, though it’s budget-saving, this option is too time-consuming today, so better leave it to your memories. Since the UK is not part the Schengen Area, passengers need to go through passport control prior to boarding.
Air trips
Though flying between London and Paris is by no means recommended, there are still a few people traveling between the two dynamic cities by air. A very low one-way fare is possible through advanced booking, but of course it’s rare, and that doesn’t include the taxi and rail fares traveling to and from the airports.
* One-way fares from Paris can be as low as 49;
* From London, Air France flies with fares as low as £39(46), and British Airways as low as £48 (56).
Rail trips
The only direct train between London and Paris is the Eurostar, which travels 15 -17 times per weekday. Eurostar’s 2015 edition trains can make the journey in two hours at speeds of up to 320 km/h. Besides, they offer good seating space.
* Fares begin at a reasonable £58(68), round trip;
* The earlier you book, the more you save.
Bus trips
The bus is by far the least expensive and longest way to travel between Paris and London. Eurolines and OUIBUS are two major bus lines traveling between the two capitals. The journey takes between seven and nine hours. Both lines advertise free Wi-Fi.
* One-way Eurolines fares begin at 15;
* One-way OUIBUS fares begin at 15 too, but early bird sales can even lower the fare.
1. Which way is probably the cheapest for a round trip?| A．By train-ferry. | B．By air. | C．By rail. | D．By bus. |
| A．Free booking. | B．Taxi pickup. |
| C．Good seating space. | D．Free Wi-Fi. |
| A．There are different competing companies. |
| B．They are cheaper if booked ahead of time. |
| C．They are more expensive from the Paris end. |
| D．There are still additional fees to be included. |
10 . From classic films like The Lion King to new Marvel and Star Wars series, the service has a lengthy list of worthy content. Look through the list of movies you can watch on Disney.
Home Alone(1990)As the McCallister family take off for Paris for the holiday season, they accidentally leave their eight-year-old son Kevin at home alone at Christmas. While he’s left behind, the house is targeted by 2 robbers, Harry Lyme and Marv Merchants, who have just come out of prison. Kevin is left to take care of himself and defend his house.
Beauty and the Beast(1997)Following the original Disney classic, the film follows everybody in the castle as they prepared for Christmas back when they were still under the spell(魔咒). Told by Mrs.Potts, we see what happened after Beast saved Belle from the wolves and they celebrated Christmas.
Good Luck Charlie(2011)The Charlies are ready for a great Christmas in Palm Springs. However, Teddy and Amy are separated from the rest of the family and madly try to find a way to Palm Springs in time for Christmas. In the end, the family are reunited and learn a lesson about the true meaning of Christmas.
Olaf’s Frozen Adventure(2017)One of Frozen’s breakout characters Olaf, the snowman, has his very own adventure as he sets out on a mission to create Christmas traditions for Elsa and Anna.
1. What do we know about Kevin in the film Home Alone?| A．He knows the robbery in advance. |
| B．He is left home alone unexpectedly. |
| C．He doesn’t like spending holiday in Paris. |
| D．He is willing to fight against the robbers. |
| A．They’re all comedies. |
| B．They’re all intended for kids only. |
| C．They’re all related to Christmas. |
| D．They’re all adventurous films. |
| A．Entertainment. |
| B．Advertisement. |
| C．News report. |
| D．Economy. |
