1 . The biggest and the smallest of the world’s animals are most at risk of dying out, according to a new analysis, with vertebrates (脊椎动物) in the so-called “Goldilocks zone”—not too big and not too small—winning out. Action is needed to protect animals at both ends of the scale, they say. The research adds to evidence that animals are dying out on such a scale that a sixth extinction is considered under way.
One clue is body size. Research on birds and mammals has shown that those with larger bodies are more likely to go extinct. Yet, when the researchers made a database of thousands of birds, mammals, fish, amphibians (两栖动物) and reptiles (爬行动物) at risk of extinction, they found disproportionate (不成比例的) losses at the large and small ends of the scale.
“Surprisingly, we found that not only the largest of all vertebrate animal species are most threatened, but the very tiniest ones are also highly threatened with extinction,” Prof. Ripple told BBC News.
Large animals, such as elephants, rhinos (犀牛) and lions have long been the target of protection efforts. However, fish, birds, reptiles and amphibians that are the giants of their kind, such as the whale shark, Somali ostrich (鸵鸟) and the Chinese giant salamander (蝾螈), tend to be overlooked. Meanwhile, small species at risk--such as frogs and shrews (鼩鼱)--receive very little attention.
“I think, for the smallest species, first of all we need to bring higher awareness to them, because the larger ones get a lot of attention, but the smaller ones get very little,” said Prof. Ripple.
In the study, vertebrates with the smallest and the largest bodies were found to be most at risk of disappearing, whether they were on land or living in oceans, streams or rivers.
Heavyweights are threatened mainly by hunting, while featherweights are losing out to pollution and cutting down forests. “Ultimately, reducing global consumption of wild meat is a key step to reduce negative impacts of hunting, fishing, and trapping on the world’s vertebrates,” they write in Proceedings of the National Academy of Sciences.
1. What made the researchers feel surprised?| A．A sixth of animals are dying out. |
| B．Small animals are in great danger. |
| C．Great losses of birds and mammals. |
| D．Big animals are at risk of disappearing. |
| A．Transform our habits. | B．Change our concepts. |
| C．Find ways to save small animals. | D．Take measures to stop pollution. |
| A．Loss of forests. | B．Climate change. |
| C．Human activities. | D．Environmental pollution. |
| A．Size Matters When It Comes to Extinction Risk |
| B．Large Animals Are Badly in Need of Protection |
| C．Why a Great Number of Animals Are Dying out |
| D．What We Should Do to Protect Endangered Species |
2 . China is determined to land its astronauts on the moon and set up a scientific station there,according to a project leader.
Zhou Yanfei,deputy chief designer of China's manned space program,said on Friday that China wishes to use the manned lunar missions to carry out scientific surveys and technology demonstrations,explore ways to develop lunar resources and strengthen the nation's space capabilities.
＂A new wave of lunar explorations has been emerging in the world,with participants aiming to make sustainable missions to deepen knowledge of the moon and exploit resources there,"he said in a report delivered at the 2020 China Space Conference in Fuzhou,Fujian province."Unlike other nations,China must depend on its own science and technology to realize our goals."
The country is independently able to land its astronauts on the moon because it has the technologies,a group of well-trained,innovative professionals and high-efficiency research and management systems,Zhou said."However,our existing carrier rockets can't perform landing missions to the moon because they are not powerful enough.The Shenzhou- series manned spaceships are not suitable for lunar expeditions.We don't have a lunar landing capsule,"he said."Our ground support system was designed for operations in low-Earth orbit rather than on the lunar surface.
To solve the problem, we set out to produce a powerful launch vehicle. Zhou said researchers thought about two approaches-making a new heavy-lift rocket,or adjusting the next-generation rocket designed to carry astronauts,which is under development.Researchers prefer the latter approach because it would be easier to design and make and would become operational earlier.
The new rocket is being designed at the China Academy of Launch Vehicle Technology.Its main body will be 87 meters tall,with a diameter of 5 meters,which would make it almost twice as tall as the Long March 5,currently the biggest of China's rockets.
1. Which is NOT the goal of the manned lunar mission?| A．To explore lunar resources. |
| B．To perform scientific experiments. |
| C．To set up a scientific station. |
| D．To strengthen the national space power. |
| A．China is not capable of pursuing the manned lunar program. |
| B．There are still difficulties in pursuing the manned lunar program. |
| C．There are a series of steps in the Manned Lunar program. |
| D．It is manageable to carry out the Manned Lunar program. |
| A．Nations must depend on themselves to explore the moon. |
| B．The Long March 5 is the biggest of China's rocket. |
| C．The newly-designed rocket will not carry astronauts. |
| D．Producing a powerful launch vehicle is the most difficult part in the program. |
| A．The new rocket is big enough to perform landing missions. |
| B．The new rocket is being made to launch lunar spaceship. |
| C．China's scientific power has improved. |
| D．The new rocket will be put into use soon. |
3 . A walk through the galleries of Quebec's Montreal Museum of Fine Arts (MMFA) places individuals face-to-face with some 43,000 artworks ranging from Chinese ceramics (陶瓷制品) to Inuit sculpture.
While the visiting is an incredible cultural experience, a group of local physicians will soon be able to prescribe(开处方) museum visits as treatment for some illnesses.
Hélène Boyer, vice president of a Montreal-based medical association, explains that museum visits have been shown to increase levels of serotonin, a neurotransmitter (神经传导物质) known as the "happy chemical" which helps to lift mood.
According to Boyer, the small increase in hormones(荷尔蒙)associated with enjoying an afternoon of art is similar to that offered by exercise, making museum prescriptions ideal for the elderly experiencing pain that prevents them from regularly joining in physical activity.
The museum visits are designed to improve traditional methods. As Bondil notes, spending time in a peaceful environment can provide a welcome distraction. "What is most important is this experience can help them escape from their own pain," she says. "When you enter the museum, you escape from the speed of our daily life."
"I am convinced that in the 21st century, culture will be what physical activity was for health in the 20th century," said Bondil. " Some people would do well to recall that just in the 19th century, sports were believed to do harm to the body. Just as doctors now prescribe exercise, they will be able to prescribe a visit to the MMFA."
1. What does Hélène Boyer think of museum visits?| A．They can cheer people up. | B．They can reduce physical activity. |
| C．They can slow down our life pace. | D．They can increase levels of art appreciation. |
| A．Stop them concentrating on pain. |
| B．Stop them focusing on traditional methods. |
| C．Encourage them not to be absent-minded. |
| D．Encourage them to slow their steps while walking. |
| A．Physical activities were popular in the 19th century. |
| B．Sports are considered to be harmful to the body. |
| C．Ideas of treating illnesses are changing over time. |
| D．Doctors prescribe museum visits regularly now. |
| A．Museum visits are ideal for the elderly. | B．Happy chemical helps to lift mood. |
| C．Peaceful environment helps escape pain. | D．Cultural activities will promote health |
4 . According to a recent study in the Journal of Consumer Research, both the size and consumption habits of our eating companions can influence our food intake. And contrary to existing research that says you should avoid eating with heavier people who order large portions(份), it's the beanpoles with big appetites you really need to avoid.
To test the effect of social influence on eating habits, the researchers conducted two experiments. In the first, 95 undergraduate women were individually invited into a lab to ostensibly(表面上)participate in a study about movie viewership. Before the film began, each woman was asked to help herself to a snack. An actor hired by the researchers grabbed her food first. In her natural state, the actor weighed 105 pounds. But in half the cases she wore a specially designed fat suit which increased her weight to 180 pounds.
Both the fat and thin versions of the actor took a large amount of food. The participants followed suit, taking more food than they normally would have. However, they took significantly more when the actor was thin.
For the second test, in one case the thin actor took two pieces of candy from the snack bowls. In the other case, she took 30 pieces. The results were similar to the first test: the participants followed suit but took significantly more candy when the thin actor took 30 pieces.
The tests show that the social environment is extremely influential when we're making decisions. If this fellow participant is going to eat more, so will I. Call it the “I’ll have what she's having” effect. However, we'll adjust the influence. If an overweight person is having a large portion, I'll hold back a bit because I see the results of his eating habits. But if a thin person eats a lot, I'll follow suit. If he can eat much and keep slim, why can't I?
1. What is the recent study mainly about?| A．Food safety. | B．Movie viewership. |
| C．Consumer demand. | D．Eating behavior. |
| A．Big eaters. | B．Overweight persons. |
| C．Picky eaters. | D．Tall thin persons. |
| A．To see how she would affect the participants. |
| B．To test if the participants could recognize her. |
| C．To find out what she would do in the two tests. |
| D．To study why she could keep her weight down. |
| A．How hungry we are. | B．How slim we want to be. |
| C．How we perceive others. | D．How we feel about the food. |
5 . Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.
Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact (接触) with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.
Like running, race walking is physically demanding, she says, According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.
However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.
As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.
1. Why are race walkers conditioned athletes?| A．They must run long distances. |
| B．They are qualified for the marathon. |
| C．They have to follow special rules. |
| D．They are good at swinging their legs. |
| A．It’s more popular at the Olympics. |
| B．It’s less challenging physically. |
| C．It’s more effective in body building. |
| D．It’s less likely to cause knee injuries. |
| A．Getting experts’ opinions. |
| B．Having a medical checkup. |
| C．Hiring an experienced coach. |
| D．Doing regular exercises. |
| A．Skeptical. | B．Objective. |
| C．Tolerant. | D．Conservative. |
6 . It’s a Saturday night, the kids are asleep and we have no plans. Before we fall into our routine and watch a movie, I try to talk my husband into playing a card game. Unconvinced, he continues tapping away on his phone. But just before disappearing into the social media rabbit hole, he has an idea. He looks over me and suggests, “Why don’t we try calling one of our friends?”
I look at him with raised brows, as if his suggestion is somewhat ridiculous and perhaps even socially unacceptable. You can’t just call someone out of the blue now…right? But then I realize in the not so distant past, this was the norm. My early teenage years saw me connecting with friends through a phone. We could chat for hours about the latest gossip and news, sometimes hiding under my blanket in order to avoid the chances of being caught by my parents. I could even memorize the phone numbers of loved ones then. I guess these days, they would be on my “Favorites” list in my smartphone.
Today, many of my “favorite” people are followed from a distance through social media, and even they very rarely—if ever—would get an actual call from me. The birth announcement by my oldest friend is received through scrolling the past pictures. The news of a divorce from a couple arrives after a photo of a woman led me on a search for more gossip. Bits of such information, may have been a part of my digital feed for years. The idea of actually picking up the phone to reconnect with a long-lost friend is a frightening one—even seeing the name of an old friend pop up in an incoming call can feel a little afraid.
I ask my husband, “Who would we call?” After tossing around a few names, we agree on some potential candidates—people whose lives have taken them in different directions, but with whom we still share deep friendships.
1. How does the author feel about her husband’s suggestion at first?| A．Excited. | B．Motivated. |
| C．Nervous. | D．Surprised. |
| A．difficult but interesting | B．peaceful and meaningful |
| C．pleasant and unforgettable | D．inconvenient but enjoyable |
| A．share more of their private information with others |
| B．contact more long-lost friends through social media |
| C．have more personal communications with their friends |
| D．add more friends’ names to the contact lists in their phones |
| A．To argue for the need of the contact of long-lost old friends. |
| B．To tell us about one of his unforgettable experiences. |
| C．To remind us to turn to phones to keep in touch with friends. |
| D．To persuade us to follow our friends through the social media. |
7 . How to Level up Your Self-Control
By definition, self-control is the ability to do something that benefits your long-term goals, instead of something that might satisfy your immediate desires.
Angela Duckworth, professor of psychology at the University of Pennsylvania, says allocating resources between your present self and future self is an ongoing struggle. For example, exhibiting self-control over spending time on video games and social media, two of the most common temptations（诱惑）of the current era, means battling against age-old mechanisms in your brain.
If you're willing to look deeply into your tendencies and weak points, you can recognize the handful of problems that you need to work on.
The problem of looking at your cell phone too often, say, can be solved by putting it on mute or, better yet, sticking it in your bag until lunch.
Finally, Duckworth advises laying a foundation of self-control that you can build of in the future.
| A．One place to start would be the office |
| B．What problems do you need to work on |
| C．We've all experienced unproductive workdays |
| D．But for many of us, short-term satisfactions are irresistible |
| E．Why is exercising proper self-control so tricky for some, and how to do better |
| F．If you can resist resigning you may achieve more on your overall self-control |
| G．Removing the temptation from sight is key to ensuring you're faithful to your mission |
8 . Saving the giant panda from extinction isn't just good for the bears-it's good for the bottom line too,a new analysis by an international team of scientist shows.
The results,published in the journal Current Biology,highlight the economic benefits that they say go hand in hand with environmental conservation. In order to protect giant pandas,the government must protect their forests,which provide a host of often-under appreciated services to the communities that live in and around them. For example,forests allow for the growing of crops and the grazing(放牧）of animals,store clean fresh water and supply firewood,lumber(木材）and many useful plants.They manage storm runoff and help prevent erosion(侵蚀）。
The pandas themselves also hold enormous cultural value that has risen rapidly in recent decades among Chinese residents,the study also points out. "From 1980 to 2010,the cultural values of pandas and their reserves almost doubled,largely driven by tourism use,rising 500-fold from 1980 to 2010, "they said.
Taking all of these factors into account,the scientists calculated a total economic value of Approximately $2. 6 billion in 2010 in China. Keep in mind,the costs of preserving panda habitat at current levels come to about$255 million. The study authors said that including the global cultural Value of the animals would increase the total economic value to $6. 9 billion per year-or about 27 times the cost of habitat preservation.
The researchers also noted that the investment in panda habitat has improved the living conditions of local residents. They pointed to data from the Chinese Statistical Yearbook showing that the annual income in Sichuan, Shanxi and Gansu provinces,which sit next to panda reserves,rose by an average of 56%from 2000 to 2010. Farmers in counties within these provinces that were next to the panda reserves saw their annual incomes rise by 64%,on average.
The findings provide a promising example of how conservation efforts can pay off,and they could be applied to many other threatened and endangered species,the study authors said.
1. What does the underlined words "bottom line"refer lo in the first paragraph?| A．Moral standard. | B．Economic profits. |
| C．Overall development. | D．Environmental conservation. |
| A．Less farmland. | B．More foreign trade. |
| C．More forest fires. | D．Better farming conditions, |
| A．26. | B．10. |
| C．4. | D．3. |
| A．Protecting pandas takes great efforts. |
| B．Pandas are a major tourism attraction in China. |
| C．Conservation of pandas is economically rewarding. |
| D．Pandas make great contributions to the environment. |
9 . The ruins of a Maya city have been discovered in Guatemala with the help of the remote sensing technique LiDAR. This lost city envelops sites like Tikal, Holmul, and Witzna, but shows that these famous areas are a small part of this lost urban network.
Hidden under the jungles of the Maya Biosphere Reserve site, more than 60,000 human-made features — homes, canals, highways, and more — have been identified in aerial (从飞机上的)images collected by some international researchers headed by the PAGUNAM Foundation, a Maya cultural and natural heritage organization. Those have experts rethinking the outlines and complexity of the Maya Empire.
These ancient peoples obviously created these imaginative cultures based on their known relics (遗迹), but the new research has suggested that the size of this lost society is far beyond what experts imagined. The findings will be explored in a one-hour documentary called “Lost Treasures of the Maya Snake Kings”, to be broadcast on the National Geographic Channel.
This breakthrough was possible thanks to LiDAR sensors, which can survey lands in 3D by bouncing pulses off the ground from unmanned air vehicles and others. LiDAR is exceptionally useful for detecting archeological(考古的)sites, as it gets through jungles and other features that hold up exploration on the ground. The technique has made many discoveries become a reality in recent years. For instance, major finds at Angkor, Cambodia and Caracol, Belize can explain what it did. The final goal is to survey Guatemala’s lowlands with it.
“There are entire cities we didn't know about now showing up in the survey data,” Francisco Estrada-Belli, one of the lead archeologists on the project, said in Nat Geo's coming documentary. “There are 20,000 square kilometres more to be explored and there are going to be hundreds of cities about the mysterious people who built this urban network there that we don’t know about, and we will push back the frontiers with the technology,” he added.
1. What does the underlined word "Those" in paragraph 2 refer to?| A．Jungles. | B．Human-made features. |
| C．Researchers. | D．Aerial images. |
| A．The working principle of LiDAR sensors. |
| B．The process of researching Maya civilization. |
| C．Great importance of Guatemalans lowlands. |
| D．LiDAR’s contribution to discovering the relics. |
| A．Small and hidden. | B．Famous and high-tech. |
| C．Vast and complex. | D．Fully-explored and imaginative. |
| A．Continue to explore the unknown. | B．Upgrade the LiDAR technology. |
| C．Study the documentary carefully. | D．Build a massive urban network, |
10 . It is common for adults to use ''baby talk'' when interacting with babies. This way of speaking attempts to imitate the sounds babies make when they first try to talk. But is this form of communication helpful to a child’s development?
Several studies have suggested a clear link between parental language methods and a child's early language development. Studies showed that language learning in babies was improved when parents spoke more than a few simple words and used a wider vocabulary. Earlier research found that the style of speech used by parents to communicate with their baby could have an influence on language development.
One such speaking style is known as ''parentese''. Research has shown that babies react better to this kind of language in the first months of life. Generally, parentese involves adults speaking in a higher voice and at a slower speed. The language is simplified, while sentences are short and often repeated. Studies from the past 30 years have confirmed that babies spoken to in parentese developed larger vocabularies throughout the first three years of life.
A new study on the subject, a project of the University of Washington's Institute for Learning & Brain Sciences, examined whether parents can be effectively taught methods to improve their parentese skills.
Naj a Ferjan Ramírez. working in the Institute for Learning＆Brain Sciences, said that the parents involved in the research were first shown the importance of language input for their baby's development. Parents were then given suggestions on how to use different parentese methods, and then rated on how well they used these methods with their child. She added that the new study is important because there are still a 1ot of parents with little knowledge about how to use parentese to help their child. This was one reason the researchers included parents from different cultural and economic groupings.
1. How do parents usually talk with their babies?| A．By speaking in a funny style. | B．By copying babies' sounds. |
| C．By raising speaking speed. | D．By whispering in babies’ears. |
| A．Babies' language skills are decided by talent. |
| B．Babies' language is improved by simple words. |
| C．Parental language style helps improve babies' behavior. |
| D．Parental language methods affect babies' language development. |
| A．In paragraph 2. | B．In paragraph 3. |
| C．In paragraph 4. | D．In paragraph 5. |
| A．Communicating with babies matters more |
| B．Parentese is a good way to practice language |
| C．The more parents help, the better babies 1earn |
| D．Speaking parentese helps with babies' language learning |
