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 . If you visit Uluwatu temple in Bali, be cautious. The long-tailed temple monkeys there are well-known thieves. Since a long time ago, they have made a living by robbing visitors of their possessions and then holding those objects until a ransom in the form of food is paid. But Jean-Baptiste Leca of the University of Lethbridge, in Canada, wondered whether these monkeys are cleverer still. Sometimes, they do not accept the first offer and hold out for more. He therefore asked himself whether they are able to assess how valuable an object is to its owner, and factor that into their negotiations.
Dr. Leca and his colleagues conducted their experiment by wandering around the temple with video cameras, recording the activities of the monkeys. Every time they saw a monkey show interest in a particular tourist? they recorded the interaction. To work out what was going on, they had first to establish the relative values of food rewards to monkeys, and of stealable objects to people.
To confirm which stealable objects are most valued by people, they divided them into six classes: empty containers, such as phone cases and plastic bottles; accessories (搭配物) such as hairpins and key rings; hats and shoes; spectacles and sunglasses; and electronics and wallets. They then observed how often victims bothered to bargain with the thief for the return of property belonging to different classes, and thus classified objects into low value, medium value and high value.
They found that monkeys do, indeed, have a complicated sense of what they are doing — at least, adults and sub-adults do. These animals have a preference for stealing high-value items, and will often hold out either for more rewards, or for better ones, if they are in possession of such items. But this is something that they have to learn how to do as they grow up. Young monkeys make no such distinctions, and sub-adults are less good at doing so than adults.
1. What is the purpose of Leca's research?| A．To prove monkeys are cleverer than men. |
| B．To find out what is valuable for monkeys. |
| C．To record the negotiations between monkeys. |
| D．To make sure monkeys can judge item values. |
| A．Bilk. | B．Reward. | C．Tax. | D．Rent. |
| A．By the material of objects. | B．By the preference of victims. |
| C．By the buying price of objects, | D．By the frequency of bargaining. |
| A．Young monkeys can evaluate items. | B．All monkeys prefer high-value items, |
| C．Monkeys have a simple sense of acts. | D．Monkeys' stealing is an acquired skill. |
3 . For children, communication with older adults is important when visits with grandparents are called off because of the pandemic(流行病).
Even before COVID-19 sent older adults into hiding, grandparents and great-grandparents could often seem like strangers to kids. Contact might include gifts of toys meant for someone a little younger, forced piano performances by parents, and really bad jokes. So, coming up with what to say to those out -of-touch people through a camera can be hard. It can be a lot of pressure for kids.
Yet keeping up with older relatives has mental and physical health benefits for everyone. According to studies, older adults who participate in programming between generations show more happiness, better self-care. And a strong relationship between grandparents and grandchildren can lessen depressive tendencies(抑郁倾向) in both adults and kids.
Having an actual relationship with a grandparent can also help children develop qualities that make all-around great citizens. “Children are born to be me, me, me,” says Tina-Anne Praas of SKIP, an Ontario-based organization. “But seeing a person who has experienced life stages pulls them away from that thinking. They can gain some worldly points of view.”
Being close with a grandparent can also help children develop communication skills, especially when they’re able to learn about and compare their experiences with a grandparent’s. And it doesn’t carry the pressure of talking to a parent.
Tina-Anne Praas adds that students who were worried about life after graduation eagerly listen to older adults sharing their own experiences from the same time of life, 50-plus years ago. One student says, “My interactions(互动) with my grandparents encouraged me to become a physician.”
1. What causes much stress for kids?| A．Playing the piano in public. |
| B．Communicating with grandparents online. |
| C．Buying gifts for other younger children. |
| D．Being out of touch with parents for a long time. |
| A．Seeing an experienced person. |
| B．Kids’ own ideas about the world. |
| C．Children’s care of themselves only. |
| D．Keeping contact with grandparents. |
| A．Supportive. | B．Doubtful. |
| C．Uncertain. | D．Worried. |
| A．listening to stories online |
| B．watching what they do daily |
| C．forming new ideas about themselves |
| D．communicating and interacting with them |
4 . Today is Friday the 13th of the year. Even though the date is known throughout Western culture as one associated with negative things, it’s really just another Friday on the calendar. There is no scientific evidence to suggest this day has an increased chance of bad occurrences compared with other days. But that doesn’t mean scientists haven’t tried to find any.
In Thomas W. Lawsons 1907 novel, Friday, the thirteenth, a businessman takes advantage of the superstition (迷信) and creates a Wall Street panic on the day. The book was the likely inspiration for a number of scientific examinations of stock market returns on Fridays that fell on the 13th day of the month compared with all other Fridays. In 2001, Brian Lucey, a business professor at Trinity College Dublin in Ireland, published his analysis of a few of those studies and found several flaws. The studies had narrow assessments overall, focusing on just a few markets or a single stock exchange. But when he analyzed the data as a whole, Lucey found that internationally, with few exceptions, returns on Friday the 13th were typically just a little higher than returns on other Fridays.
The scientific evidence for cause and effect may not be there, but people may still alter their behavior on Friday the 13th in a way that causes certain things to happen. The way people drive might be different from their usual. But the few studies that have examined traffic accidents haven’t found statistically significant trends to suggest Friday the 13th is more dangerous than other Fridays on the road.
The science is clear: Friday the 13th is a normal day. Yet, people continue to think this is meant to be a bad day. “Psychologically, superstitions arise from the desire to influence external events, decrease anxiety and reduce uncertainty,” said Neil Dagnall, a psychologist at Manchester Metropolitan University. “Besides, I don’t think people know often why they do things.”
1. Why is Friday the 13th usually associated with negativity?| A．The date increases possibility of risks. | B．Scientists have found enough evidence. |
| C．Culture has taught people to believe so. | D．Things always go bad or worse on the day. |
| A．Novels relating to Friday the 13th. | B．Written records of Wall Street panic. |
| C．Analysis of successful business cases. | D．Stock market returns on Friday the 13th |
| A．human fear of Friday the 13h is not necessary |
| B．traffic accidents can be avoided on other Fridays |
| C．people tend to behave strangely on Friday the 13th |
| D．staying at home is recommended on Friday the 13h |
| A．They can lead to endless human desires. |
| B．They can help people to reduce anxiety. |
| C．They cause great harm to physical health. |
| D．They produce a sense of controlling everything |
5 . Parents around the world often urge children over and over-wash your hands! It can be difficult, however, to get children to remember to wash. But what if washing hands was connected to a fun creative activity? What if instead of simply reaching for the soap, a machine could drop it right into your hands?
Well, such a machine was recently built by a boy and his sister in the U.S. state of Maryland as part of a creative competition.The not-for-profit Rube Goldberg Organization is holding the competition.
Every year, the Rube Goldberg competition assigns a specific task, considering inventions that use complex systems to carry out a simple everyday task. At first, the task for 2020 was supposed to be “turn on a light.” But when the COVID-19 happened, the task was changed to “drop a bar of soap into someone’s hand.”
Those taking part in the competition are schoolchildren. But with schools closed to slow the spread of the virus, organizers changed the rules. This year, the team can include any family members and people were asked to send in recordings of the machines to compete. One thing has not changed: The machine must complete the task in less than 10 steps.
In Maryland, the Diel family wanted to enter. So, Caitlin and her brother Ben designed and built their own Rube Goldberg machine. Next, they had to demonstrate that it could complete the task-throwing the soap just right to be caught in someone’s hand. After 106 failed attempts, they finally had success. With their video demonstration, they can now enter the competition.
Dr. Anne Glowinski teaches child psychiatry (精神病学) at Washington University School of Medicine in St. Louis. She said that “creativity and play” connects with children. It is better than the message. “We have to wash our hands because of this horrible virus”. Glowinski added.
1. What might be a task of inventions assigned by the Rube Goldberg competition?| A．Sweeping the floor. | B．Exploring nature. | C．Writing a novel. | D．Painting the house. |
| A．All kinds of inventions are admitted. |
| B．A video of the entry is qualified to enter. |
| C．Teachers are encouraged to get involved. |
| D．The task must be finished within 10 steps. |
| A．Practical. | B．Unnecessary. | C．Economical. | D．Complicated. |
| A．To advocate the habit of washing hands. |
| B．To call on schoolchildren to compete in a contest. |
| C．To encourage more inventions from everyday items. |
| D．To introduce a contest making handwashing fun for kids. |
6 . You’re walking around and a thought occurs: “I should check my phone.” The phone comes out of your pocket. You type a message. Then your eyes remain glued to the screen, even when you walk across the street. We all do this kind of distracted walking, or“twalking.”
Why are we so addicted to it? People are, by nature, information-seeking creatures. When we regularly check our phones, we are snacking on information from devices that offer an all-you-can-eat buffet of information. And in some ways, smartphones were designed to be irresistible to information-seeking creatures.
However, at what point is this considered addiction?
Not all constant phone use was considered addictive, said Steven Sussman, a professor at the University of Southern California. External pressures, like a demanding job, could force people to frequently check their phones. But when people check their devices just to enhance their mood, this could be a sign of a developing problem.
Another signal of addictive behavior is becoming preoccupied with smartphone use when you should be doing something else. An even clearer indicator is what happens when the phone is taken away.
“Let’s say you go out to the mountains and you don’t get reception, so you can’t use a smartphone,” Dr. Sussman said. “Do you feel a sense of relief? Or do you feel, wow, I want to get out of these mountains — I want to use the smartphone. If you feel the latter, that’s toward the addictive direction.”
Jim Steyer, the chief executive of Common Sense Media, said there needed to be a broad public awareness campaign over the dangers of walking and texting in parallel with distracted driving.“You have distracted pedestrians and distracted drivers, so it’s the double whammy,” he said. “Tech addiction hits in both ways.”
1. What is probably the proper explanation of the word “twalking”?
| A．Talk while working. |
| B．Text while walking. |
| C．Travel while walking. |
| D．Tease others while walking. |
| A．Twaling is interesting and beneficial. |
| B．The news on the cellphone is of great value. |
| C．Twalking is trend that everyone want to follow. |
| D．Smartphones comply with our eagerness for information. |
| A．We use smartphones constantly for work. |
| B．When we use the smartphones, we are in a bad mood. |
| C．When smartphones are taken away, we are anxious to find them. |
| D．Climbing mountains without cellphone makes us feel a sense of relief. |
| A．Distracted driving is more dangerous than twalking. |
| B．Twalking brings more dangers than distracted driving. |
| C．The number of twalking people is equal to distracted drivers. |
| D．Twalking and distracted driving deserve more public concern. |
7 . Scientists have long known a fairly reliable way to extend life span in rodents(啮齿类动物) and other lab animals: Reduce the amount of calories they eat by 10 percent to 40 percent.
This strategy known as caloric restriction, has been shown to increase the life span of various organisms and reduce their rate of cancer and other age-related ailments. Whether it can do the same in people has been an open question. But an intriguing new study suggests that in young and middle-aged adults, chronically(慢性地) restricting calorie intake can have an impact on their health.
In the new study, researchers looked at a group of 143 healthy men and women who were instructed to practice caloric restriction for two years, with the aim of cutting the calories they consumed by 25 percent.
On average, the dieters managed to slash about 12 percent of their total calories, or roughly 300 calories a day, the amount in a few chocolate chip cookies or a small Starbucks Mocha. But the group saw many of their health markers improve.
They lost weight and body fat. Their blood pressure fell slightly, and they had better blood sugar control and less inflammation. At the same time, a control group of 75 healthy people who did not practice caloric restriction saw no improvements in any of these markers. Some of the benefits in the calorie restricted group stemmed from the fact that they lost a large amount of weight. However, the results of the survey suggest that caloric restriction might have some unique biological effects on disease pathways in the body.
Calorie restriction may be a useful tool for better health and weight loss, but it’s unclear whether the changes in the new study will ultimately translate into longevity and reductions in chronic disease, said Frank Hu, the chairman of the nutrition department at the Harvard, who was not involved in the research.
1. What happened to the lab animals, after the amount of calories was reduced?| A．More lab animals got cancers. |
| B．More Lab animals can live longer. |
| C．Health condition of lab animals got worse. |
| D．Lab animals will suffer from no disease in their future life. |
| A．Their healthy markers improved. |
| B．They did not get chronic diseases. |
| C．They did not get lose any weight at all. |
| D．They did not eat chocolate chip cookies. |
| A．Reduce. | B．Increase. |
| C．Add. | D．Beat. |
| A．Calorie restriction is beneficial to weight loss. |
| B．People with caloric restriction will love longer than others. |
| C．More people should be encouraged to take caloric restriction in life. |
| D．The relation between caloric restriction and longer lifespan is uncertain. |
8 . Sometimes life can seem challenging (挑战的) and we usually get the feeling of “the grass on the other side is always greener”! We usually feel upset with the troubles that life throws at us.
The best thing to do at that point of time is to close our eyes and start counting of all the blessings in life that God has given us.
If we think deeply, our life is full of blessings that we hardly recognize. Listening to the singing of birds early in the morning, we realize that there are many people who spend their life in a world that is silent while many others spend their lives in a world that is dark and may have never seen a rainbow or the setting sun.
When you go out for a drive, pull down the window and look at the poor beggar standing under the hot sun, begging for filling his hungry stomach. We get three meals a day without realizing its importance. Isn’t that a blessing?
Whenever you are sad, look at the eyes of your parents and family filled with love and concern for you. There are many people who have never experienced the love of a family. Isn’t that a blessing?
As Mother Teresa once said, “We don’t need to do great things. We need to do small things with great love”.
The key to a happy life is when we consider others problems to be our own and try to help them. When we love people without any expectations and help them, our heart is filled with a sense of happiness and peace seeing the smile on their face.
So the next time whenever life knocks you down, close your eyes and…start counting!
1. What does the author intend to tell us?| A．True happiness lies in achieving wealth. |
| B．Blessings should be treasured in our life. |
| C．The singing of birds can make us happy. |
| D．Love from our family gives us courage to face life. |
| A．however happy we are, we never seem to be satisfied |
| B．though we are rich, we are poor in mind |
| C．we can have a better life if we work harder |
| D．there exists a greener grass on the other side |
| A．We have already known that life is filled with blessings. |
| B．It is a blessing to have three meals a day. |
| C．It’s natural to see a rainbow or the setting sun in life. |
| D．Mother Teresa calls on us to do great things in life. |
| A．Troubles in Life | B．Secrets of Life |
| C．A Sense of Happiness | D．Count Your Blessings |
9 . A 2018 report found that food waste would increase by a third to 2. 1billion tons by 2030. Beyond the cost of the waste itself，thrown-away food generates a gas that contributes to climate change.
Home delivery meal kits(盒)can reduce food waste by more than two-thirds，but suppliers need to switch to reusable packaging to make them environmentally friendly.
Tailor-made meal kits cut waste by providing people with precise amounts of fresh ingredients(烹饪原料)for chosen recipes，meaning leftovers are minimized. But while the delivery services score well on reducing food waste，buying the same food ingredients from the supermarket almost always saves energy overall simply because meal kits use so much single-use packaging. The good news is that if people have meals that are tailored for consumption，they won’t overbuy and have less food waste. They fine-tune the amount of food to what they will actually eat.
Meal kits can reduce transport emissions(排放)if people go to the supermarket less frequently. If people only go and buy such goods as soap and toilet paper，they may only have to visit once every couple of months. A delivery truck can carry meals for a lot of people in the neighborhood. So dozens of car trips might be replaced with one truck trip.
However，study found that even if delivery meal kits reduced food waste to zero，they would still use up more energy overall than buying the same food from the supermarket unless the energy used for the meal kit packaging was cut by a fifth. The packaging is a killer if it’s single-use and thrown away，which can make all the environmental benefits lost. But if the packaging can be reused，if it’s glass bottles，like in the old days，we can get some benefits.
1. What can we learn about home delivery meal kits?| A．They can cut down on daily expenses. |
| B．They will totally solve the problem of food waste. |
| C．They can keep energy consumption to a minimum. |
| D．They will benefit the environment with reusable packaging. |
| A．Attach. | B．Adjust. |
| C．Raise. | D．Compare. |
| A．reduce transport emissions | B．save more food |
| C．shop only in the supermarket | D．shorten car trip distances |
| A．Supportive. | B．Unfavorable. |
| C．Objective. | D．Indifferent. |
10 . One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone (无人机) into a remote-controlled pollinator (授粉媒介) by attaching horsehairs coated with a special, sticky gel to its underbelly.
Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees — but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could disrupt ecosystems, but also because it could disrupt agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.
Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work,” said senior author Eijiro Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a gel, one he’d considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn’t dried up or degraded at all. “I was so surprised because it still had high viscosity,” Miyako said.
The chemist noticed that when dropped, the gel absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen (花粉). He and his colleagues chose a drone and attached horsehairs to its smooth surface to mimic a bee’s fuzzy body. They coated those horsehairs in the gel, and then controlled the drones over lilies, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.
The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the gel had about 10 times more pollen than those that had not been coated with the gel.
Miyako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.
1. What does the underlined word “viscosity” in Para.3 probably mean?| A．Hardness. | B．Stickiness. |
| C．Flexibility. | D．Purity. |
| A．bees disrupt both agriculture and economy |
| B．scientists have invented self-powered robot insects |
| C．bees in the United States are on the edge of extinction |
| D．Miyako found the special feature of the gel by chance |
| A．its body is made like a bee’s |
| B．its GPS works more efficiently |
| C．some flowers are coated with the gel |
| D．horsehairs with the gel are attached to it |
| A．are not yet ready for practical use |
| B．may eventually replace bees in the future |
| C．are much more efficient than bee pollinators |
| D．can provide a solution to economic depression |
