1 . After Scott Kelly spent a year in space, his genetic expression changed, according to a NASA study that compared the bodily changes between the astronaut and his identical twin, who stayed on Earth while Kelly was aboard the International Space Station. About 7 percent of Kelly’s gene activity has yet to “return to normal” — almost two years after his yearlong spaceflight mission came to an end. Kelly has since retired from NASA.
The Twins Study，as it’s been called，looked at what happened to Kelly — both physiologically and psychologically :— before，during and after his trip in space，and then compared that data to Kelly’s twin brother，Mark Kelly，also a retired NASA astronaut.
Unlike his brother who spent months at a time in space，Mark’s missions were on the shorter side. His last — and longest — mission，which took place in 2011，lasted 15 days.
“By measuring large numbers of the brother’s metabolites，cytokines (代谢物、细胞活素）and proteins，researchers learned that spaceflight is associated with oxygen deprivation (匮乏）stress， increased inflammation (炎症），and nutrient changes that affect gene expression，” NASA said.
Although most of the biological changes Kelly experienced in space disappeared in the hours and days (and in some cases? weeks) after his return to Earthy, NASA said some changes appear to have continued. While 93 percent of his genetic expression has returned to normal, several hundred “space genes” still have changed activity levels，the data suggests， which, NASA said, could indicate “longer-term changes” in genetic expression caused by the stresses of spaceflight.
NASA said the research could provide important knowledge of the effects of long-term spaceflight on the human body, and that it will influence its planning for a mission to Mars, which would see astronauts spending some three years in space.
Reacting to the news of the study results, Kelly expressed amazement at his body’s changes， and also used the opportunity to make fun of his brother. “This could be good news,” he joked on Twitter. “I no longer have to call Mark my identical twin brother anymore.”
1. What can be learnt about Mark Kelly?| A．He’s still working for NASA. |
| B．He has only been to space once. |
| C．He hasn’t gone on a spaceflight mission yet. |
| D．He never stayed in space for a whole month. |
| A．They’re dangerous to astronauts. |
| B．Most of them won’t last very long. |
| C．They’re mainly caused by psychological stress. |
| D．Some can occur during short-term spaceflight. |
| A．It involved many twin participants. |
| B．It ended soon after Scott Kelly’s last spaceflight. |
| C．It only studied Scott Kelly’s physical changes. |
| D．It will be valuable to NASA’s Mars mission. |
| A．Mark Kelly will lose his twin brother soon. |
| B．Scott Kelly always looks on the bright side. |
| C．Scott Kelly doesn’t like his twin brother. |
| D．Scott Kelly seems to have a sense of humor. |
2 . Several weeks ago, a mysterious Christmas card dropped through our mailbox. The envelope was addressed to a man named Raoul, who, I was relatively certain, did not live with us. The envelope wasn’t sealed, so I opened it. The inside of the card was blank. Ed, my husband, explained that the card was both from and to the newspaper deliveryman. His name was apparently Raoul, and Raoul wanted a holiday tip. We were meant to put a check inside the card and then drop the envelope in the mail. When your services are finished at 4 a.m., you can’t simply hang around, like a hotel bellboy expecting a tip. You have to be direct.
So I wrote a nice holiday greeting to this man who, in my imagination, fires The New York Times from his bike aimed at our front door, causing more noise with mere newsprint than most people manage with sophisticated(复杂的) black market fireworks. With a start, I realized that perhaps the reason for the 4 a.m. wake-up noise was not ordinary rudeness but carefully executed spite(怨恨): I had not tipped Raoul in Christmas past. I honestly hadn’t realized I was supposed to. This was the first time he’d used the card tactic(策略). So I got out my checkbook. Somewhere along the line, holiday tipping went from an optional thank-you for a year of services to a Mafia-style protection racket (收保护费组织).
Several days later, I was bringing our garbage bins back when I noticed an envelope taped to one of the lids. The outside of the envelope said MICKEY. It had to be another tip request, this time from our garbage collector. Unlike Raoul, Mickey hadn’t enclosed his own Christmas card from me. In a way, I appreciated the directness. “I know you don’t care how merry my Christmas is, and that’s fine,” the gesture said. “I want $30, or I’ll ‘forget’ to empty your garbage bin some hot summer day.” I put a check in the envelope and taped it back to the bin. The next morning, Ed noticed that the envelope was gone, though the trash hadn’t yet been picked up: “Someone stole Mickey’s tip!” Ed was quite certain. He made me call the bank and cancel the check. But Ed had been wrong. Two weeks later, Mickey left a letter from the bank on our steps. The letter informed Mickey that the check, which he had tried to cash, had been cancelled.
The following Tuesday morning, when Ed saw a truck outside, he ran out with his wallet. “Are you Mickey?” The man looked at him with scorn(轻蔑). “Mickey is the garbageman. I am the recycling.” Not only had Ed insulted(侮辱) this man by suggesting that he was a garbageman, but he had obviously neglected to tip him. Ed ran back inside for more funds. Then he noticed that the driver of the truck had been watching the whole incident. He peeled off another twenty and looked around, waving bills in the air. “Anyone else?”
Had we consulted the website of the Emily Post Institute, this embarrassing break of etiquette (礼节) could have been avoided. Under “trash/recycling collectors” in the institute’s Holiday Tipping Guidelines, it says: “$10 to $30 each.” You may or may not wish to know that your hairdresser, mailman and UPS guy all expect a holiday tip.
1. The newspaper deliveryman put a blank card inside the envelope because________..| A．he wanted the couple to pay for the newspaper | B．he forgot to write a few words on it |
| C．he used it to ask for a Christmas tip | D．he was afraid of asking for a tip in person |
| A．didn’t like Raoul’s way of delivering the paper |
| B．didn’t realize why Raoul delivered the paper that way before |
| C．didn’t know that Raoul delivered the paper for them |
| D．didn’t feel it necessary to meet Raoul when he came |
| A．excited | B．happy | C．embarrassed | D．forced |
| A．He wrote a letter to the couple afterwards. |
| B．He failed to collect the money from the bank. |
| C．He wanted the couple to send him a Christmas card. |
| D．He collected both the check and the garbage that day. |
| A．Ed was desperate to correct his mistake | B．Ed only wanted to give money to Raoul |
| C．Ed was unwilling to tip the truck driver | D．Ed no longer wanted to give them money |
| A．their garbage bin might not be emptied one day if the writer didn’t give tips |
| B．the writer could have avoided giving tips if they had consulted the website of the Emily Post Institute |
| C．the writer’s husband didn’t know Raoul at all |
| D．the writer’s family was too poor to give the tips |
3 . Last year, 138,000 San Francisco residents used Airbnb, a popular app designed to connect home renters and travelers. It’s a striking number for a city with a population of about 850,000, and it was enough for Airbnb to win a major victory in local elections, as San Francisco voters struck down a debatable rule that would have placed time restrictions and other regulations on short-term rental services.
The company fiercely opposed the measure, Proposition F, with a nearly $10 million advertising campaign. It also contacted its San Franciscan users with messages urging them to vote against Proposition F.
Most people think of Airbnb as a kind of couch-surfing app. The service works for one-night stays on road trips and longer stays in cities, and it often has more competitive pricing than hotels. It’s a textbook example of the “sharing economy”, but not everyone is a fan.
The app has had unintended consequences in San Francisco. As the San Francisco Chronicle reported last year, a significant amount of renting on Airbnb is not in line with the company’s image: middle-class families putting up a spare room to help make ends meet. Some users have taken advantage of the service, using it to turn their multiple properties into vacation rentals or even full-time rentals. Backers of Proposition F argued that this trend takes spaces off the conventional, better-regulated housing market and contributes to rising costs.
“The fact is, widespread abuse of short-term rentals is taking much needed housing off the market and harming our neighborhoods,” said ShareBetter SF, a group that supported Proposition F. Hotel unions have protested the company’s practices in San Francisco and other cities, saying that it creates an illegal hotel system.
San Francisco is in the middle of a long-term, deeply rooted housing crisis that has seen the cost of living explode. Actually, explode is a generous term. The average monthly rent for an apartment is around $4, 000. Located on a narrow outcropping of land overlooking the bay, San Francisco simply doesn’t have enough space to accommodate the massive inflow of young, high-salaried tech employees flocking to Silicon Valley.
As the Los Angeles Times reported, some San Francisco residents supported the measure simply because it seemed like a way to check a big corporation. Opponents of Proposition F countered that the housing crisis runs much deeper, and that passing the rule would have discouraged a popular service while doing little to solve the city’s existing problems.
1. The intention of Proposition F is to ________.| A．place time limits in local election. | B．set limits on short-term rental. |
| C．strike down a controversial rule. | D．urge users to vote against Airbnb. |
| A．It shrinks the living space of middle-class families. |
| B．Users are taken advantage of by the service financially. |
| C．It makes the house market more competitive. |
| D．It indirectly leads to high house rental price. |
| A．explosion of the living cost | B．its geographic characteristics |
| C．generosity of local enterprises | D．inflow of migrant population |
| A．objective | B．supportive |
| C．negative | D．indifferent |
4 . Inequality in the workplace has long been a hot topic but gender economist Roy is actively turning that conversation into action. She founded Pipeline Equity, a company that employs artificial intelligence (AI) to identify and drive economic gains through gender equality. "The idea was: If we could change decisions that are made in organizations, we could actually make gender equality a reality in our lifetime, rather than the hundred or so years that we World Economic Forum (WEF) predicts." Roy said.
The WEF’s predictions were made before the COVID-19 pandemic hit, which Roy called a "she-session," because women have lost the majority of jobs during this particular economic downturn. "With remote work and with people being at home with children, most caregiving and unpaid work falls to women."
There has been much talk about such situations being good for gender equality, but Roy warned while working from home could help keep more women in the workforce, it could have a negative impact on female promotions.
"At this moment, there's the opportunity to employ AI to ensure we make progress on gender equality, ""Roy explained. "For companies, that is particularly important because in the 008 Great Recession（经济大萧条），companies that put equality at the core of their crisis management strategy actually increased the speed of their recovery."
But to close the gender pay gap, we can't start by talking about pay. "Pay is the symptom it’s not the disease." Roy said. "Pay is the quantitative（数量的）value that you place on your talent. But the actual value happens before that in performance and potential. "That's where Pipeline's platform steps in.
Using natural language processing, Pipeline's platform reads through performance reviews and calls out any biased phrases. They've found that on average, women are under-valued 4 percent of the time, and that actually impacts their ability to be promoted, as well as their pay.
"As this moment, we have the opportunity to embrace AI as a tool to achieve get equality." Roy said
1. Women in the workplace may face problems EXCEPT________.| A．Being under-valued | B．getting a lower pay |
| C．Heavy economic burden | D．smaller chances of promotion |
| A．AI had long been employed in the workplace |
| B．gender equality was the key to solving the crisis |
| C．Gender equality could play an important role during economic crisis |
| D．the present situation was similar to that of the 2008 Great Recession |
| A．Pay is the root of gender inequality. |
| B．Pay is not worth attaching importance to. |
| C．Pay is just an indicator of gender inequality. |
| D．Pay is the first step towards ensuring gender quality. |
| A．Pay gap will soon be closed. |
| B．AI brings equality into the workplace. |
| C．It’s time to ensure equality in the workplace. |
| D．The more women in the workplace, the better. |
5 . What is the best part of a typical relaxing summer day? Nothing is better than sitting in an armchair with a beer and some chips in your hand, enjoying the great comfort.
The much-loved combination of beer and chips is being exploited for the first time to deal with climate change. Chips firm Walkers has adopted a technique it says will cut CO2 emissions (排放) from its production process by 70%.
The technology will use CO2 captured from beer processing in a brewery (啤酒厂), which is then mixed with potato waste and turned into fertilizer. It will then be spread on UK fields to feed the following year’s potato crop. Creating fertilizer normally produces high CO2 emissions, but the technology adopted by Walkers makes fertilizer without generating CO2. So, the beer-and-chips combination performs a double function. It stops the emission of brewery CO2 into the atmosphere — and it saves on the CO2 normally generated by fertilizer production.
This Creative win-win solution was developed with an approval from the UK government by a 14-employee start-up called CCm. The fertilizer was experimented on potato seed beds this year, and next year Walkers will install CCm equipment at its Leicester factory to prepare for its 2022 crop.
A decision has not yet been made on which brewery Walkers will work with on this. The new technology adds to carbon-saving techniques already under way. The firm has installed an anaerobic digester (厌氧消化池), which feeds potato waste to bacteria to produce a useful gas. The gas is burned to make electricity for the chip-frying process — so this saves on burning gas or coal.
The new system will go a step further by taking away potato “cake” left after digestion — and mixing the brewery CO2 into it to make an enriched fertilizer which will help put carbon back into the soil as well as encouraging plant growth.
It’s an example of scientists finding ways to use CO2 emissions which otherwise would increase the over-heating of the planet.
1. What is the purpose of the first paragraph?| A．To draw readers’ attention. |
| B．To entertain readers. |
| C．To show how useful beer and chips are to our life. |
| D．To introduce a way of life. |
| A．It will be totally cost-free. |
| B．It doesn’t consume any energy. |
| C．It will be a perfect solution to climate change. |
| D．It is environmentally-friendly. |
| A．How CO2 is turned into fertilizer. |
| B．How the technology stops CO2 emissions. |
| C．How an energy-saving green technology works. |
| D．The advantages of a new technology. |
| A．The technology will fix the problem of global warming. |
| B．Walkers has a wide range of partner choices.? |
| C．This technology will be adopted by many chips firms soon. |
| D．Scientists are seeking solutions to climate change. |
6 . Immersive Van Gogh
From the creators of the blockbuster show in Paris seen by over two million visitors and still wowing crowds in Toronto, the west coast premiere (首场) of the Immersive Van Gogh Exhibit will bring the art of Vincent to life in Los Angeles.
Immersive art is not just a technical way to represent video and audio in huge spaces. The word immersive indicates a deep commitment of intentions which connect images and sounds in a way that the audience is able to experience a different way of the art.
True to its name, this exhibition transforms the iconic (偶像的) paintings of Vincent van Gogh into moving, wall-filling projections. “Immersive Van Gogh” promises half-a-million cubic feet of projections that pull from some of the post-impressionist’s most recognizable pieces, including The Bedroom, Sunflowers and, yes, The Starry Night.
You will experience art like never before—lose yourself in entrancing, moving images that highlight brushstrokes, detail, and color—truly illuminating (照亮) the mind of the genius.
LOCATION
The Immersive Van Gogh Exhibit is located at a secret place situated in the heart of Los Angeles. To be announced before the exhibit opens, existing ticket holders will receive an email with the place name and location once it is made public.
TICKET PRICES
| VIP TICKETS—$99.99 ●Priority access ●Van Gogh cushion (a gift for you) ●Limited edition poster | PREMIUM TICKETS—$59.99 ●Van Gogh cushion (rental) ●Limited edition poster |
| BASIC TICKETS—$54.99 ●Admission only | CHILD TICKETS—$29.99 ●Ages 6—16 (children 5 and under do not require a ticket) ●Admission only ●Child tickets are not subject to change of date fees |
Tickets are available online at www.vangoghla.com.
GIFT SHOP
Stop by our Exhibit Gift Shop to take the magic of Van Gogh home with you! From clothing and jewelry to home décor, children’s books, and so much more, you will find unique and thoughtful souvenirs at the Immersive Van Gogh Exhibit. Also be sure to check out at our online store!
Experience the organic landscapes of Van Gogh’s imagination, and journey through his brilliance and madness in a completely new and unforgettable way.
1. According to the passage, the Immersive Van Gogh Exhibit ________.| A．presents Van Gogh’s art in a modern way |
| B．begins a journey to Van Gogh’s hometown |
| C．displays Van Gogh’s paintings on moving walls |
| D．designs projects on Van Gogh’s learning experience |
| A．An email. | B．A website. |
| C．The ticket office. | D．The gift shop. |
| A．$109.98. | B．$154.98. |
| C．$159.98. | D．$199.98. |
7 . In 1997, a group of twenty British women made history. Working in five teams with four women in each team, they walked to the North Pole. Apart from one experienced female guide, the other women were all ordinary people who had never done anything like this in their lives before. They managed to survive in an environment which had defeated several very experienced men during the same period.
Once on the ice, each woman had to ski along while dragging a sledge (雪橇) weighing over 50 kilos. This would not have been too bad on a smooth surface, but for long stretches (一片地域), the Arctic ice is pushed up into huge piles two or three meters high and the sledges had to be pulled up on side and carefully let down the other so that they didn’t crash. The temperature was always below freezing point and sometimes strong winds made walking while pulling so much weight almost impossible. It was also very difficult to put up their tents when they stopped each night.
In such conditions the women were making good progress if they covered fourteen or fifteen kilometers a day. But there was another problem. Part of the journey was across a frozen sea with moving water underneath the ice and at some points the team would drift (漂流) back more than five kilometers during the night. That meant that after walking in these very terrible conditions for ten hours on one day, they had to spend part of the next day covering the same ground again. Furthermore, each day it would take three hours from waking up to setting off and another three hours every evening to set up the camp and prepare the evening meal.
So, how did they manage to succeed? They realized that they were part of a team. If any one of them didn’t pull her sledge or get her job done, she would endanger the success of the whole expedition (远征探险). Any form of selfishness could result in the efforts of everyone else being completely wasted, so personal feelings had to be put to one side. At the end of their journey, the women agreed that it was mental effort far more than physical fitness that got them to the North Pole.
1. What was so extraordinary about the expedition?| A．It was a new experience for most of the women. |
| B．The women did not have any men with them. |
| C．The women had not met one another before. |
| D．There was no one leading it. |
| A．being left behind | B．damaging the sledges |
| C．falling over on the ice | D．breaking the ice |
| A．they got too tired | B．they kept getting lost |
| C．the ice was moving backwards | D．the temperatures were very low |
| A．Strict but caring. | B．Proud but patient. |
| C．Honest and devoted. | D．Determined and strong-willed. |
| A．Experience must be bought. |
| B．Facts speak louder than words. |
| C．He who risks nothing gains nothing. |
| D．Motivation and teamwork achieve goals. |
8 . Every year more people recognize that it is wrong to kill wildlife for “sport”. Progress in this direction is slow because shooting is not a sport for watching, and only those few who take par realize the cruelty and destruction.
The number of gunners, however, grows rapidly. Children too young to develop proper judgments through independent thought are led a long way away by their gunning parents. They are subjected to advertisements of gun producers who describe shooting as good for their health and gun-carrying as a way of putting redder blood in the veins（血管）. They are persuaded by gunner magazines with stories honoring the chase and the kill. In school they view motion pictures which are supposedly meant to teach them how to deal with arms safely but which are actually designed to stimulate（刺激）a desire to own a gun.
Wildlife is disappearing because of shooting and because of the loss of wildland habitat Habitatloss will continue with our increasing population, but can we slow the loss of wildlife caused by shooting? There doesn't seem to be any chance if the serious condition of our birds is not improved. Wildlife belongs to everyone and not to the gunners alone. Although most people do not shoot, they seem to forgive shooting for sport because they know little or nothing about it. The only answer, then, is to bring the truth about sport shooting to the great majority of people.
Now, it is time to realize that animals have the same right to life as we do and that there is nothing fair or right about a person with a gun shooting the harmless and beautiful creatures. The gunners like to describe what they do as character-building, but we know that to wound an animal and watch it go through the agony of mortality can make nobody happy. If, as they would have you believe, gun-carrying and killing improve human character, then perhaps we should encourage war.
1. According to the text, most people do not seem to be against hunting because .| A．they have little knowledge of it. |
| B．it helps to build human character. |
| C．it is too costly to stop killing wildlife. |
| D．they want to keep wildlife under control. |
| A．difficulty. | B．tress. | C．pain. | D．sadness. |
| A．teach them how to deal with guns safely. |
| B．praise hunting as character building. |
| C．describe hunting as a physical exercise. |
| D．encourage them to have guns of their own. |
| A．Hunting to build human character makes no sense. |
| B．War in the best way to improve human character. |
| C．We are on the edge of war against gunners. |
| D．Protecting wildlife from gunners is extremely difficult. |
9 . If your in-box is currently reporting unread messages in the hundreds or thousands, you might have a hard time believing the news: e-mail is on the decline.
At first thought, that might seem to be the case. The incoming generation, after all, doesn’t do e-mail. Oh, they might have an account. They use it only as we would use a fax machine: as a means to communicate with old-school folks like their parents or to fulfill the sign-up requirements of Web sites. They rarely check it, though.
Today’s instant electronic memos — such as texting and Facebook and Twitter messages — are more direct, more concentrated, more efficient. They go without the salutation (称呼语) and the signoff (签收); we already know the “to” and “from.” Many corporations are moving to messaging networks for exactly that reason: more signal, less noise and less time. This trend is further evidence that store-and-forward systems such as e-mail and voicemail are outdated. Instead of my leaving you a lengthy message that you pick up later, I can now send you an easily-read message that you can read — and respond to — on the go.
The coming of the mobile era is responsible for the decline of e-mail. Instant written messages bring great convince to people. They can deal with them at about any time: before a movie, in a taxi, waiting for lunch. And because these messages are very brief, they’re suitable for smart phone typing.
Does this mean e-mail is on its way to the dustbin of digital history? Not necessarily. E-mail still has certain advantages. On the other hand, tweets and texts feel ephemeral — you read them, then they’re gone, into an endless string, e-mail still feels like something you have and that you can file, search and return to later. It’s easy to imagine that it will continue to feel more appropriate for formal communications: agreements, important news, longer explanations.
So, e-mail won’t go away completely. Remember, we’ve been through a transition (过度) like this not so long ago: when e-mail was on the rise, people said that postal mail was dead. That’s not how it works. Postal mail found its smaller market, and so will e-mail. New technology rarely replaces old one completely; it just adds new alternatives.
1. What would the incoming generation like to do with their e-mail accounts?| A．Check bank accounts. | B．Send long messages. |
| C．Fill in some forms. | D．Communicate with their colleagues. |
| A．The possible reasons behind the decline of e-mail |
| B．The likes and dislikes of the young generation |
| C．The rapid development of e-communication channels |
| D．Evidence about the uncertain future of easily-consumed messages |
| A．Automatically-sending. | B．Randomly-written. |
| C．Hardly- recognized. | D．Shortly-appearing. |
| A．It’s too early to determine the decline of e-mail. |
| B．E-mail has reasons to exist with its own advantages. |
| C．E-mail, just like postal mail has come to its end. |
| D．We should feel sorry for the decline of e-mail. |
10 . As the effects of climate change become more disastrous, well-known research institutions and government agencies are focusing new money and attention on an idea: artificially cooling the planet, in the hopes of buying humanity more time to cut greenhouse gas emissions.
That strategy, called solar climate intervention (干预) or solar geoengineering, involves reflecting more of the sun’s energy back into space — abruptly reducing global temperatures in a way that imitates the effects of ash clouds flowing out from the volcanic eruptions. The idea has been considered as a dangerous and fancied solution, one that would encourage people to keep burning fossil fuels while exposing the planet to unexpected and potentially threatening side effects, producing more destructive hurricanes, wildfires floods and other disasters.
But. as global warming continues, producing more destructive hurricanes, wildfires floods and other disasters, some researchers and policy experts say that concerns about geoengineering should be outweighed by the imperative to better understand it, in case the consequence of climate change become so terrible that the world can’t wait for better solutions.
One way to cool the earth is by injecting aerosols (气溶胶) into the upper layer of the atmosphere. where those particles reflect sunlight away from the earth. That process works, according to Douglas MacMartin, a researcher at Cornell University.
“We know with 100% certainty that we can cool the planet,” he said in an interview. What’s still unclear, he added, is what happens next. Temperature, MacMartin said, is an indicator for a lot of climate effects. “What does it do to the strength of hurricanes?” he asked, “What does it do to agriculture production? What does it do to the risk of forest fires?”
Another institution funded by the National Science Foundation will analyze hundreds of simulations of aerosol injection, testing the effects on weather extremes around the world. One goal of the research is to look for a sweet spot: the amount of artificial cooling that can reduce extreme weather events without causing broader changes in regional rainfall patterns or similar impacts.
1. Why do researchers and government agencies work on cooling the earth?| A．To prevent natural disasters. | B．To win more time to reduce gas emissions. |
| C．To imitate volcanic eruptions. | D．To encourage more people to bur fossil fuels. |
| A．More volcanoes will throw out. |
| B．More solar energy will go into space. |
| C．More disasters will endanger the future of the world. |
| D．People will keep burning fossil fuels to keep warm. |
| A．He thinks more research remains to be done. |
| B．He is optimistic about the effect of cooling the earth. |
| C．He is concerned about the reduction in agriculture production. |
| D．He disapproves of the practice of solar climate intervention. |
| A．The rainfall pattern of a region. |
| B．The modest drop in temperature. |
| C．The number of extreme weather events. |
| D．The injection amount of aerosol. |
