1 . Every decision we make is arrived at through hugely complex neurological processing. Although it feels as though you have a choice, the action that you ‘decide’ to take is entirely directed by automatic neural activity. Brain imaging studies show that a person’s action can be predicted by their brain activity up to 10 seconds before they themselves become aware they are going to act. Multiple neuroscientific studies show that even those important decisions that feel worked out are just as automatic as knee-jerk reactions (膝跳反应) (although more complex).
Decision-making starts with the amygdala: a set of two almond-shaped nuclei (杏仁状核) buried deep within the brain, which generate emotion. The amygdala registers the information streaming in through our senses and responds to it in less than a second, sending signals throughout the brain. These produce an urge to run, fight, freeze or grab, according to how the amygdala values various stimuli.
Before we act on the amygdala’s signals, however, the information is usually processed by other brain areas, including some that produce conscious thoughts and emotions. Areas concerned with recognition work out what’s going on, those concerned with memory compare it with previous experiences, and those concerned with reasoning, judging and planning get to work on constructing various action plans. The best plan—if we are lucky—is then selected and carried out. If any of this process goes wrong, we are likely to hesitate, or do something silly.
The various stages of decision-making are marked by different types of brain activity. Fast (gamma)waves, with frequencies of 25 to 100 Hz, produce a keen awareness of the multiple factors that need to be taken into account to arrive at a decision. If you are trying to choose a sandwich, for instance, gamma waves generated in various cells within the ‘taste’ area of the brain bring to mind and compare the taste of ham, hummus, wholemeal, sourdough, and so on. Although it may seem useful to be aware of the full range of choice, too much information makes decision-making more difficult, so irrelevant factors get dismissed quickly and unconsciously.
After this comparison stage, the brain switches to slow-wave activity (12 to 30 Hz). This extinguishes most of the gamma activity, leaving just a single ‘hotspot’ of gamma waves which marks the chosen option.
Although there is no ‘you’ outside your brain to direct what it’s doing, you can help it to make good decisions by placing yourself in a situation which is likely to make the process run more smoothly. Doing something that is physically or mentally stimulating before making a decision will help your brain produce the initial gamma waves that generate awareness of the competing options. Getting over-excited, on the other hand, will prevent the switch to the slow brainwaves, making it much harder to single out a choice.
1. Why does the writer mention “knee-jerk reactions” in the first paragraph?| A．To introduce the finding of the latest brain imaging studies. |
| B．To illustrate that decisions are not consciously thought out. |
| C．To call attention to a kind of neural reaction that is not very complex. |
| D．To show the difference between decision-making and other brain activity. |
| A．It works out conscious thoughts and emotions. |
| B．It selects the best action plan for a given situation. |
| C．It dismisses factors that are irrelevant to the decision to be made. |
| D．It processes sensory information and generates emotional responses. |
| A．Slow-wave activity usually lasts longer than fast-wave activity. |
| B．The brain prioritizes information before settling on a final choice. |
| C．Decision-making is difficult when slow-wave activity occurs first. |
| D．The brain needs as much information as possible to make a decision. |
| A．By preparing the brain to single out the most reasonable choice. |
| B．By helping the brain switch to slow-wave activity more quickly. |
| C．By getting the brain to focus on those most relevant alternatives. |
| D．By making the brain more aware of the factors and choices involved. |
1. 这种单车的使用方法（如：APP查看车辆、扫码开锁等）；
2. 这种单车的优势；
3. 你对这种单车的看法。
注意：
1. 词数大约100左右；
2. 开头和结尾已给出，不计入总词数。
提示词：智能手机 smartphone, 二维码 the QR code
Dear Jim,
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Yours,
Li Hua
3 . On March 7, 1907, the English statistician Francis Galton published a paper which illustrated what has come to be known as the “wisdom of crowds” effect. The experiment of estimation he conducted showed that in some cases, the average of a large number of independent estimates could be quite accurate.
This effect capitalizes on the fact that when people make errors, those errors aren’t always the same. Some people will tend to overestimate, and some to underestimate. When enough of these errors are averaged together, they cancel each other out, resulting in a more accurate estimate. If people are similar and tend to make the same errors, then their errors won’t cancel each other out. In more technical terms, the wisdom of crowds requires that people’s estimates be independent. If for whatever reasons, people’s errors become correlated or dependent, the accuracy of the estimate will go down.
But a new study led by Joaquin Navajas offered an interesting twist (转折) on this classic phenomenon. The key finding of the study was that when crowds were further divided into smaller groups that were allowed to have a discussion, the averages from these groups were more accurate than those from an equal number of independent individuals. For instance, the average obtained from the estimates of four discussion groups of five was significantly more accurate than the average obtained from 20 independent individuals.
In a follow-up study with 100 university students, the researchers tried to get a better sense of what the group members actually did in their discussion. Did they tend to go with those most confident about their estimates? Did they follow those least willing to change their minds? This happened some of the time, but it wasn’t the dominant response. Most frequently, the groups reported that they “shared arguments and reasoned together”. Somehow, these arguments and reasoning resulted in a global reduction in error. Although the studies led by Navajas have limitations and many questions remain, the potential implications for group discussion and decision-making are enormous.
1. What is paragraph 2 of the text mainly about?| A．The methods of estimation. | B．The underlying logic of the effect. |
| C．The causes of people’s errors. | D．The design of Galton’s experiment. |
| A．the crowds were relatively small | B．there were occasional underestimates |
| C．individuals did not communicate | D．estimates were not fully independent |
| A．The size of the groups. | B．The dominant members. |
| C．The discussion process. | D．The individual estimates. |
| A．Unclear. | B．Dismissive. | C．Doubtful. | D．Approving. |
Having worked at a small food store for two years, I thought I had become successful at what our manager called “customer relations”. I firmly believed that a friendly smile and an automatic “sir”, “madam”, “thank you” and “sorry” would see me through any situation. But on a Christmas night an old woman shook my belief that such a glib (油嘴滑舌的) response could smooth over any difficulty while dealing with other human beings.
The moment she entered the store, the woman presented a sharp contrast to our shiny store with its bright lighting and neatly arranged shelves. Walking as if each step were painful, she slowly pushed open the glass door. On such a zero-degree night, she was wearing only a faded print dress, a thin sweater too small to button, and black slippers with the backs cut out to expose heels. There were no stockings or socks on her blue-veined (青筋的) legs.
After walking around the store for several minutes, the old woman stopped in front of the rows of canned vegetables. She looked at the row of cans, finally picked up a can of corn and stared at the label. At that point, I decided to be a good and polite employee and asked her if she needed help. As I stood close to her, my smile became harder to maintain. An unpleasant smell of sweat rose from her torn clothing.
“I need some food,” she muttered in reply to my bright “Madam, can I help you?”
“Are you looking for corn, madam?”
“I need some food,” she repeated, looking down at the can in her hand, “Any kind.”
“Well, the can of corn is ninety-five cents, madam.” I said in my most helpful voice. “Or if you like, we have a special on bread today.”
After a short pause, she lifted her head and said, “But I can’t pay.”
For a second, it was on the tip of my tongue to tell her that she could take the corn. Then the employee rules flooded into my mind: remain polite but do not let the customers take advantage of you.
注意：1. 续写词数应为150左右；
2. 续写部分分为两段，每段的开头语已为你写好。
At the thought of that, I managed a friendly smile.
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Instantly I rushed out of the door with the can of corn and stopped the old woman.
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1. 简述刷短视频的利与弊；
2. 你的观点。
注意：1. 词数80左右；
2. 开头与结尾已给出，不计入总词数。
参考词汇：刷短视频 watch short videos
Good morning, everyone.
I’d like to
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________That’s all. Thank you.
6 . What is a database? A database is a collection of data or information that is organized, stored, and accessed electronically.
It is relevant (相关的). When searching for information in the database, you should be able to get results relevant to you. There are several ways to search through a database, for example, using keywords, subject headings, terminology (术语)，etc.
It is accessible. First of all, access to the library is either free or bought by supporters so that you can access the information within it at no price.
| A．It is reliable. |
| B．It is reasonable. |
| C．You may have to pay a small amount of money as an independent researcher. |
| D．Google Scholar isn't a database using the above three aspects as a determining factor. |
| E．It is organized so that searching and finding this information is easy and rapid. |
| F．They are all relevant factors to be referred to when searching educational databases. |
| G．So you can limit your search results to a certain source type or date, or you can search by author or title. |
7 . A robot created by Washington State University (WSU) scientists could help elderly people with dementia (痴呆) and other limitations live independently in their own homes.
The Robot Activity Support System, or RAS, uses sensors installed in a WSU smart home to determine where its residents are, what they are doing and when they need assistance with daily activities. It navigates (定位) through rooms and around obstacles to find people on its own, provides video instructions on how to do simple tasks and can even lead its owner to objects like their medication or a snack in the kitchen.
“RAS combines the convenience of a mobile robot with the activity detection technology of a WSU smart home to provide assistance in the moment, as the need for help is detected,” said Bryan Minor, a postdoctoral researcher in the WSU School of Electrical Engineering and Computer Science.
Currently, an estimated 50 percent of adults over the age of 85 need assistance with every day activities such as preparing meals and taking medication and the annual cost for this assistance in the US is nearly $2 trillion. With the number of adults over 85 expected to triple by 2050, researchers hope that technologies like RAS and the WSU smart home will relieve some of the financial strain on the healthcare system by making it easier for older adults to live alone.
RAS is the first robot researchers have tried to incorporate into their smart home environment. They recently published a study in the journal Cognitive Systems Research that demonstrates how RAS could make life easier for older adults struggling to live independently.
“While we are still in an early stage of development, our initial results with RAS have been promising,” Minor said. “The next step in the research will be to test RAS’ performance with a group of older adults to get a better idea of what prompts, video reminders and other preferences they have regarding the robot.”
1. How does RAS serve elderly people?| A．Through sensors. | B．Through objects. |
| C．Through a mobile robot. | D．Through their daily activities. |
| A．It is the first robot used in daily life. | B．Its function remains to be tested. |
| C．It can locate people and do any task. | D．It can cook for owners on its own. |
| A．Doubtful. | B．Negative. |
| C．Optimistic. | D．Uncertain. |
| A．Elderly people leave the nursing home. |
| B．Smart Home Tests first elder-Care robot. |
| C．RAS, the first robot to make home smart. |
| D．Older adults have benefited from RAS. |
8 . Modern lifestyles are generally quite different from those of our hunter-gatherer ancestors, a fact that some claim as the cause of the current rise in global obesity, but new results published July 25 in the open access journal PLOS ONE find that there is no difference between the energy expenditure(耗费) of modern hunter-gatherers and Westerners, casting doubt on this theory.
The research team behind the study, led by Herman Pontzer of Hunter College in New York City, along with David Raichlen of the University of Arizona and Brian M. Wood of Stanford measured daily energy expenditure among the Hadza, a population of traditional hunter-gatherers living in the open Savannah of northern Tanzania. Despite spending their days hiking long distances to seek for wild plants and game, the Hadza burned no more calories each day than adults in the U.S. and Europe. The team ran several analyses accounting for the effects of body weight, body fat percentage, age, and gender. In all analyses, daily energy expenditure among the Hadza hunter-gatherers was indistinguishable(难以区分的) from that of Westerners. The study was the first to measure energy expenditure in hunter-gatherers directly; previous studies had relied entirely on estimates.
These findings overturn the long-held assumption that our hunter-gatherer ancestors expended more energy than modern populations, and challenge the view that obesity in Western populations results from decreased energy expenditure. Instead, the similarity in daily energy expenditure across a broad range of lifestyles suggests that habitual metabolic(新陈代谢的) rates are relatively constant among human populations. This in turn supports the view that the current rise in obesity is due to increased food consumption, not decreased energy expenditure. It means we have more to learn about human physiology(生理学) and health, particularly in non-Western settings.
"These results highlight the complexity of energy expenditure. It's not simply a function of physical activity," says Pontzer.” Our metabolic rates may be more a reflection of our shared evolutionary past than our diverse modern lifestyles."
1. According to the new research, hunter-gatherers consume _________.| A．the same energy as Westerners | B．more energy than Westerners |
| C．less energy than Westerners | D．the same food as Westerners |
| A．By comparing hiking distances. | B．By identifying wild plants and game. |
| C．By estimating daily energy expenditure. | D．By measuring daily energy expenditure. |
| A．the rise in obesity is due to increased food consumption |
| B．decreased energy expenditure makes Westerners fat |
| C．daily energy expenditure stays the same in history |
| D．humans’ habitual metabolic rates are unchanged |
| A．Our physiology activity. | B．Our energy expenditure. |
| C．Our metabolic rates. | D．Our modern lifestyle. |
9 . Antarctica(南极洲)’s melting ice, which has caused global sea levels to rise by at least 13.8 millimeters over the past 40 years, was thought to primarily come from the unstable West Antarctic Ice Sheet(WAIS). Now, scientists have found that the East Antarctic Ice Sheet (EAIS)—considered largely unaffected by climate change—may also be melting at an unexpectedly rapid speed.
The WAIS, whose base is below sea level, has long been considered the most likely to break down. Besides gravity, a deep current of warm water slips beneath the sheet, melting it from below until it becomes a floating shelf at risk of breaking away. In contrast, extreme cold and a base mostly above sea level are thought to keep the EAIS relatively safe from warm waters.
But as greenhouse gases warm much of the planet, driving stronger polar winds, some scientists think warm water carried by a circular current will start to invade East Antarctica’s once unassailable ice. A cooperation of more than 60 scientists last year, published in Nature, estimated that the EAIS actually added about 5 billion tons of ice each year from 1992 to 2017.
Eric Rignot of the University of California, Irvine, and colleagues combined 40 years of satellite imagery and climate modeling and found that overall Antarctica now sends six times more ice into the sea each year than it did in 1979, with the majority coming from West Antarctica. But East Antarctica was responsible for more than 30% of Antarctica’s contribution to the 13.8-millimeter sea level rise over the past 40 years. “The more we look at this system the more we realize this is fragile,” Rignot says. “Once these glaciers become unstable there is no red button to press to stop it.”
Rignot hopes the study brings greater attention to a part of Antarctica that has traditionally been understudied. Helen Fricker, a glaciologist (冰川学家) in California, agrees. “We need to monitor the entire Antarctica and we just can’t do that without international cooperation.”
1. What is the new finding of scientists?| A．The east Antarctica is losing ice at an increasing rate. |
| B．The west Antarctica is melting six times faster than in 1979. |
| C．5 billion tons of ice is added to Antarctica each year. |
| D．The sea level has risen by 13.8 mm over the past 40 years. |
| A．A base mostly over sea level. | B．The force of gravity. |
| C．The invasion of a warm current. | D．Extremely low temperature. |
| A．Fragile. | B．Unattackable. |
| C．Mild. | D．Unstable. |
| A．Satellite imagery. | B．Global monitoring. |
| C．Worldwide climate modeling. | D．Worldwide combined efforts. |
10 . We’ve all been there: in a lift, in line at the bank or on an airplane, surrounded by people who are, like us, deeply focused on their smartphones or, worse, struggling with the uncomfortable silence.
What’s the problem? It’s possible that we all have compromised conversational intelligence. It’s more likely that none of us start a conversation because it’s awkward and challenging, or we think it’s annoying and unnecessary. But the next time you find yourself among strangers, consider that small talk is worth the trouble. Experts say it’s an invaluable social practice that results in big benefits.
Dismissing small talk as unimportant is easy, but we can’t forget that deep relationships wouldn’t
even exist if it weren’t for casual conversation. Small talk is the grease(润滑剂) for social communication, says Bernardo Carducci, director of the Shyness Research Institute at Indiana University Southeast. ＂Almost every great love story and each big business deal begins with small talk,＂ he explains. ＂The key to successful small talk is learning how to connect with others, not just communicate with them.＂
In a 2014 study, Elizabeth Dunn, associate professor of psychology at UBC, invited people on their way into a coffee shop. One group was asked to seek out an interaction(互动) with its waiter; the other, to speak only when necessary. The results showed that those who chatted with their server reported significantly higher positive feelings and a better coffee shop experience. ＂It’s not that talking to the waiter is better than talking to your husband,＂ says Dunn. ＂But interactions with peripheral(边缘的) members of our social network matter for our well-being also.＂
Dunn believes that people who reach out to strangers feel a significantly greater sense of belonging, a bond with others. Carducci believes developing such a sense of belonging starts with small talk. ＂Small talk is the basis of good manners,＂ he says.
1. What phenomenon is described in the first paragraph?| A．Addiction to smartphones. |
| B．Inappropriate behaviours in public places. |
| C．Absence of communication between strangers. |
| D．Impatience with slow service. |
| A．Showing good manners. | B．Relating to other people. |
| C．Focusing on a topic. | D．Making business deals. |
| A．It improves family relationships. | B．It raises people’s confidence. |
| C．It matters as much as a formal talk. | D．It makes people feel good. |
| A．Conversation Counts | B．Ways of Making Small Talk |
| C．Benefits of Small Talk | D．Uncomfortable Silence |
