1 . Heads or Tails?

Careful: It’s not 50-50

The phrase “coin toss” is a classic synonym for randomness. But since the 18th century, mathematicians have _________ that even fair coins tend to land on one side slightly more often than the other. Proving this tiny bias, _________, would require hundreds of thousands of carefully recorded coin flips, making laboratory tests a logistical (后勤的，组织协调的) _________.

František Bartoš, currently a Ph.D. candidate studying the research methods of psychology at the University of Amsterdam, became interested in this _________ four years ago. He couldn’t _________ enough volunteers to investigate it at first. But after he began his Ph.D. studies, he tried again, recruiting 47 volunteers from six countries. Multiple weekends of coin flipping later, including one 12-hour marathon _________, the team performed 350,757 tosses, breaking the previous record of 40,000.

With one side initially upward, the flipped coin landed with the same side facing _________ as before the toss 50.8 percent of the time. The large number of throws allows _________ to conclude that the nearly 1 percent bias isn’t a fluke (侥幸). “We can be quite sure there is a bias in coin flips after this data set,” Bartoš says.

The leading theory explaining the _________ advantage comes from a 2007 physics study by Stanford University statisticians, whose calculations predicted a same-side bias of 51 percent. From the moment a coin is launched into the air, its entire track — including whether it lands on heads or tails — can be calculated by the laws of __________. The researchers determined that airborne coins don’t turn around their symmetrical axis (对称轴); __________, they tend to move off-center, which causes them to spend a little more time high in the air with their initial “up” side on top.

For day-to-day decisions, coin tosses are as good as random because a 1 percent bias isn’t __________ with just a few coin flips, says statistician Ameli, who wasn’t involved in the new research. Still, the study’s conclusions should eliminate any lasting doubt regarding the coin flip’s slight bias. “This is great experiment-based evidence __________ the bias,” she says.

It isn’t difficult to prevent this bias from influencing your coin-toss matches; simply __________ the coin’s starting position before flipping it should do the trick. But if your friends are __________ the tiny bias, you may as well benefit from your slight advantage. After all, 51 percent odds beat a casino’s house advantage. “If you asked me to bet on a coin,” Bartoš says, “why wouldn’t I give myself a 1 percent bias?”

2 . History has not yet _______ what we will definitively call the postmillennial cohort (2000年后出生的人) that now _______ more than 60 million people in the U.S. These kids and _______ with no concept of life _______ the Internet have so far been called the App Generation and Generation Z. They’ve been referred to as Homelanders, having grown up under the ghost of terorism. They’ve also been _______ the Plurals, for their historic diversity, as well as the Founders, at least by MTV.

Whatever we _______ naming them, marketers and academies are turning their attention to this group, which has billions in _______ and is already shaping the culture. This generation is growing up “totally and utterly connected,” says California State University psychologist Larry Rosen. Experts like Rosen have concerns about these kids’ Google-inspired expectations that everything be _______. They worry about their inability to _______ even five seconds of boredom. And they worry about the demands that come with ________ several identities online, from Facebook to Twitter to Snapchat. “There’s so much pressure on young people, who are still ________ their identities, to present this crystallized, idealized identity online,” says the University of Washington’s Katie Davis.

Historian Neil Howe sees ________ with the Silent Generation, the spoilt, risk-avoiding, “nice” generation of kids who grew up during the Great Depression and World War II, although some marked differences are found. Today’s youths are also coming of age among geopolitical trouble and fears about the economy, he says, ________ schools emphasize an intense far-reaching sensitivity to other kids. He suspects this ________ will be known for being well behaved and perhaps boring the culture by playing it safe. “There are typical examples that occur repeatedly,” Howe says, “even if they go by different ________.”

3 . What do you know about fashion? The fashion industry, which has become one of the most _________ to the planet, is having a moment of punishment. But which changes make a difference, and which ones just _________ in the wash? In fact, the fashion industry is second only to the oil industry, the most environmentally unfriendly industry.

A friend of mine _________ an antique clothes store in the north of London. Business has been good for many years, which makes her acquire a large fortune. Every few weeks, she visits a vast storehouse on the edge of the city to go through piles of clothing. Most of it is _________, but if you know what you are looking for, there are raw diamonds. The storehouse has a long history. It was once a clearing house for the low-quality wool scraps(碎料) that were used to make cheap clothing for the _________ in Victorian Britain. A century on, _________ has changed. Nowadays, it is full of modern-day inferior products, all _________ cheap clothing made for the masses around the world. Except that this stuff is going to be burned or buried, not being reused.

The items are the products of an industry that, in the past 30 years, has become one of the most successful and also most _________ on the planet. Known as fast fashion, it has filled our wardrobes(衣柜) with cheap and cheerful clothes. But after three decades of continuous growth, the model is in _________ with fundamental environmental limits and there is widespread agreement – even from within the industry – that it is time to ____________. Otherwise, “Fast fashion” creates a mountain of unsellable, cheap clothing that ends up in a terrible place.

“The fashion industry represents a key environmental ____________,” says Kirsi Niinimäki at Aalto University in Espoo, Finland. “Eventually, the long-term stability of the fashion industry ____________ the total abandonment of the fast-fashion model.” Like fast food, fast fashion is all about instant ____________ on the cheap.

One wonders: What can we do about it? Don’t you have any clothes on? It’s not that ____________. More importantly, don’t waste, learn to control your desires and ____________ falling into this “Fast fashion” lifestyle. As the guardian columnist Lucy Seagal once said, the “Fast fashion” industry is profit-driven, but consumers who have experienced “over-consumption” will naturally grow tired of it, and the market will have its choice.

4 . On a bright sunny day, I stared my day off by volunteering at the L. A. Food Bank. My reason for volunteering at the food bank was to satisfy my need to help others and leave a _________, however small a difference it is, in someone’s world. As I_________the food bank, there were lots of people there. The room appeared to be _________as people waited in lines to _________with coordinators (协调员). Everybody volunteering began heading quickly to their given _________ after checking in. Coordinators _________ me to repackage donated food items (物品) from local food drives after being sorted and _________ by other volunteer. When I _________ the donated food items, each bag had to _________ the correct amount of food items. As a team. we effectively worked similarly to a __________assembly (装配) line as the items continuously moved down the __________to volunteers. We __________placed the food items into bags before the table would get overcrowded. My __________ was that all this hard work and effort would be worth it by allowing us to __________ those in need. My task required a lot of __________ when trying to work swiftly with my hands while ensuring that items placed in bags were correctly __________·Here I had a chance to communicate with a variety of people while improving my __________ skills .We worked together as a team to __________ that our task was going effectively.

By helping pack food items. I was able to make as significant impact on my community by helping people fight __________ and giving them hope for a better life. After this experience, I feel a sense of __________within me which does not usually happen.

6 . Artificial intelligence (AI) has amazing potential to change the world, and we’ve only just begun to scratch the surface. As AI matures and people move further away from distinct programming and monitoring of systems, unidentified bias (偏见) might make decisions continue for a long time that cause _______ harm for individuals and society. This bias might _______ input data or even the algorithms (算法) themselves.

All too often, data sets are incomplete and the sample represented in the data set does not _______ the population that the AI model is making predictions about — this is known as coverage bias. Some other types of bias related to input data include sampling bias, where data is not collected randomly from the target group, and participation bias, where users from certain groups _______ surveys at different rates than users from other groups. Still, another more challenging bias to identify is confirmation bias that occurs when a decision maker or analyst has a strong _______ belief or experience that affects their ability to consider alternatives. This could lead one to more strongly _______ data that confirms a preexisting belief.

Bias resulting from AI algorithms themselves, or algorithmic bias, is equally _______. One example of algorithmic bias is implicit bias or unconscious bias, where data scientists _______ make associations or assumptions based on their mental models and memories that affect data modeling decisions. Implicit bias can _______ how data is collected and classified, or how systems are designed and developed. As machines learn, their conclusions and decisions affect people. Ethical (道德的) AI must understand these impacts and create governance and testing methods to ________ mistakes and inaccuracies.

To create ethical AI, companies need to put the ________ of the individual at the center of data innovation. This means thinking about ________ rights as human rights and developing a comprehensive approach to data, including how we use AI.

Having ________ data practices for AI means having good AI governance. This governance not only focuses on data and analytics but also understands the impacts of any given analysis and makes sure it’s ________ and accurate. Good AI governance includes data responsibility as well as a commitment to transparency (透明性).

None of this will be easy, but true innovation never is. By coming together and working on the problem of bias now, before it becomes a(n) ________ force, businesses can help bring out the best AI has to offer the world.

8 . If the ________ are just right, some of the electrons inside a(n) ________ will arrange themselves into a tidy honeycomb pattern（蜂巢状结构）— like a solid within a ________. Physicists have now ________ imaged these ‘Wigner crystals’, named after the Hungarian-born ________ Eugene Wigner, who first imagined them almost 90 years ago. Researchers had ________ created Wigner crystals and measured their properties before, but this is the first time that anyone has actually taken a snapshot of the patterns, says study co-author Feng Wang, a physicist at the University of California, Berkeley. “If you say you have an electron crystal, show me the crystal,” he says. The results were published on 29 September in Nature.

To create the Wigner crystals, Wang’s team built a device ________ atom-thin layers of two similar semiconductors: tungsten disulfide（二硫化物）and tungsten diselenide（联硒化物）. The team then used an electric field to tune the density of the electrons that moved freely along the interface between the two layers.

In ordinary materials, electrons zoom around too quickly to be ________ affected by the ________ between their negative charges. But Wigner predicted that if electrons travelled slowly enough, that repulsion would begin to dominate their behaviour. The electrons would then find ________ that minimize their total energy, such as a ________. So Wang and his colleagues slowed the electrons in their device by ________ it to a few degrees above absolute zero.

A mismatch ________ the two layers in the device also helped the electrons to form Wigner crystals. The atoms in each of the two semiconductor layers are slightly different distances apart, so pairing them together creates a honeycomb ‘moiré pattern’（蝶纹结构）, similar to that seen when overlaying two grids. That repeating pattern created regions of slightly lower energy, which helped the electrons ________. The team used scanning tunnelling microscope(STM) to see this Wigner crystal. In an STM, a metal tip hovers above the surface of a sample, and a(n) ________ causes electrons to jump down from the tip, creating an electric current.

9 . Is loyalty in the workplace dead?

Just recently, Lynda Gratton, a workplace expert, proclaimed that it was. In The Financial Times, she said that it had been “killed off through _________ contracts, outsourcing, automation and multiple careers.”

It’s sad if this good virtue is now out of place in the business world. But the situation may be more _________. Depending on how you _________ it, loyalty may not be dead, but is just playing out differently.

Fifty years ago, an employee could stay at the same company for decades, said Tammy Erickson, an author and work-force consultant. Many were _________ longtime employment along with health care and a pension.

Now many companies cannot or will not hold up their end of the bargain, so why should the employees hold up theirs? Given the opportunity, they’ll take their skills and their portable retirement accounts elsewhere. These days, Ms. Gratton writes, _________ is more important than loyalty: “Loyalty is about the future - trust is about the present.”

Ms. Erickson says that the quid pro quo (交换物，报酬) of modern employment is more likely to be: As long as I work for you, I promise to have the relevant skills and _________ fully in my work; in return you’ll pay me _________, but I don’t expect you to care for me when I’m 110.

For some baby boomers, this _________ has been hard to accept. Many started their careers _________ that they would be rewarded based on tenure (任职).

A longtime employee who is also productive and motivated is of enormous value, said Cathy Benko, chief talent officer at Deloitte. On the other hand, she said, “You can be with a company a long time and not be highly committed.”

Ms. Benko has seen her company shift its ____________ to employees’ level of engagement - or “the level at which people are motivated to deliver their best work” - rather than length of tenure.

Then there are the effects of the recent recession. Many people - if they haven’t been ____________- have stayed in jobs because they feel they have no choice. Employers may need to prepare for disruptions and turnover when the job market improves.

If the pendulum(摇摆不定的事态或局面) shifts, how will businesses persuade their best employees to stay? ____________ may do the trick, but not always. Especially with younger people, “you’re not going to buy extra loyalty with extra money,” Ms. Erickson said. ____________, employers need to make jobs more challenging and give workers more creative space, she said.

Loyalty may not be what it once was, but most companies will still be better off with at least a core of people who stay with them across decades.

If loyalty is seen as a ____________ to keep workers of all ages fulfilled, productive and involved, it can continue to be cultivated in the workplace - to the ____________ of both employer and employee.

10 . The most important day I remember in all my life is the one on which my teacher, Anne Mansfield Sullivan, came to me. I am filled with wonder when I consider the immeasurable contrasts between the two lives which it connects. It was the third of March, 1887, three months before I was seven years old.

On the afternoon of that eventful day, I stood on the porch, dumb, ________. I guessed vaguely from my mother's signs and from the hurrying to and from in the house that something unusual was about to happen, so I went to the door and waited on the steps. The afternoon sun penetrated the mass of honeysuckle that covered the porch, and fell on my upturned face. My fingers lingered almost ________ on the familiar leaves and blossoms which had just ________ to greet the sweet southern spring. I did not know what the future held of ________ or surprise for me. Anger and bitterness had preyed upon me continually for weeks and a deep languor(倦怠)had ________ this passionate struggle.

Have you ever been at sea in a dense fog, when it seemed as if a tangible white darkness shut you in, and the great ship, tense and anxious, groped her way toward the shore with plummet(铅锤) and sounding-line(测深索), and you waited with beating heart for something to happen? I was like that ________ before my education began, only I was without   ________ or sounding-line, and had no way of knowing how near the ________ was. "Light! Give me light!" was the wordless cry of my soul, and the light of love shone on me in that very hour.

I felt approaching footsteps. I stretched out my hand as I would to my mother. Someone ________ it, and I was caught up and held close in the arms of her who had come to ________ all things to me, and more than all things else, to love me.

The morning after my teacher came she led me into her room and gave me a doll. The little blind children at the Perkins Institution had sent it and Laura Bridgman had dressed it; but I did not know this until ________. When I had played with it a little while, Miss Sullivan slowly spelled into my hand the word "d—o—l—l." I was at once interested in this finger play and tried to ________ it. When I finally succeeded in making the letters correctly I ________ with childish pleasure and pride. Running downstairs to my mother I held up my hand and made the letters for doll. I did not know that I was spelling a word or even that words existed; I was simply making my fingers go in monkey-like imitation. In the days that followed I learned to spell in this ________ way a great many words, among them pin, hat, cup and a few verbs like sit, stand and walk. But my teacher had been with me several weeks before I understood that everything has a ________.