Read the following passage and choose the best answer (A, B, C, D):
Carols were first sung in Europe thousands of years ago, but these were not Christmas Carols. They were pagan songs, sung at the Winter Solstice celebrations as people danced round stone circles. Carols used to be written and sung during all four seasons, but only the tradition of singing them at Christmas has really survived. Early Christians took over the pagan solstice celebrations for Christmas and gave people Christian songs to sing instead of pagan ones. However, not many people liked them as they were all written and sung in Latin, a language that the normal people couldn’t understand. This was changed by St. Francis of Assisi when, in 1223, he started his Nativity Plays in Italy. The people in the plays sang songs or ‘canticles’ that told the story during the plays. Sometimes, the choruses of these new carols were in Latin; but normally they were all in a language that the people watching the play could understand and join in! The new carols spread to France, Spain, Germany and other European countries. The earliest carol, like this, was written in 1410. Sadly only a very small fragment of it still exists. Most Carols from this time and the Elizabethan period are untrue stories, very loosely based on the Christmas story, about the holy family and were seen as entertaining rather than religious songs. They were usually sung in homes rather than in churches! Traveling singers or Minstrels started singing these carols and the words were changed for the local people wherever they were traveling. Before carol singing in public became popular, there were sometimes official carol singers called ‘Waits’. These were bands of people led by important local leaders who had the only power in the towns and villages to take money from the public. Also, at this time, many orchestras and choirs were being set up in the cities of England and people wanted Christmas songs to sing, so carols once again became popular. New carols services were created and became popular, as did the custom of singing carols in the streets. Both of these customs are still popular today! One of the most popular types of Carols services are Carols by Candlelight services. At this service, the church is only lit by candlelight and it feels very Christmassy! Carols by Candlelight services are held in
countries all over the world.
7. The word “customs” in paragraph 5 refers to _____

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
"Did you see that?" Joe said to his friend Bill. "You're a great shooter!"
Bill caught the basketball and bounced it before throwing it again. The ball flew into the net. "Bill, you never miss!" Joe said admiringly.
"Unless I'm in a real game," Bill complained. "Then I miss all the time."
Joe knew that Bill was right. Bill performed much better when he was having fun with Joe in the school yard than he did when he was playing for the school team in front of a large crowd.
"Maybe you just need to practice more," Joe suggested.
"But I practice all the time with you!" Bill objected. He shook his head. "I just can't play well when people are watching me."
"You play well when I'm watching," Joe pointed out.
"That's because I've known you since we were five years old," Bill said with a smile. "I'm just not comfortable playing when other people are around."
Joe nodded and understood, but he also had an idea.
The next day Joe and Bill met in the school yard again to practice. After a few minutes, Joe excused himself.
"Practice without me," Joe said to his friend. "I'll be back in a minute."
Joe hurried through the school building, gathering together whomever he could find - two students, a math teacher, two secretaries, and a janitor. When Joe explained why he needed them, everyone was happy to help.
Joe reminded the group to stay quiet as they all went toward the school's basketball court. As Joe had hoped, Bill was still practicing basketball. He made five baskets in a row without noticing the silent people standing behind him.
"Hey, Bill!" Joe called out finally.
Bill turned. A look of surprise came over his face.
I just wanted to show you that you could play well with people watching you," Joe said. "Now you'll have nothing to worry about for the next game!"

In line 6, the word performed is closest in meaning to      

Read the following passage and choose the best answer (A, B, C, D):
Although experts agree that traditional meetings are essential for making certain decisions and developing strategy, many employees view them as one of the most unnecessary parts of the workday. The result is not only hundreds of billions of wasted dollars, but the worsening of what psychologists call “meeting recovery syndrome”: time spent cooling off and regaining focus after a useless meeting.  It’s isn’t anything novel that workers feel fatigued after a meeting, but only in recent decades have scientists deemed the condition worthy of further investigation. Meeting recovery syndrome (MRS) is most easily understood as a slow replenishment of our limited mental resources. When an employee sits through an ineffective meeting their brain power is essentially being drained away, says Joseph A. Allen, a professor at the University of Utah. If they last too long, fail to engage employees or turn into lectures with little to no personal interactions, meetings will significantly diminish employees’ psychological stamina. Taking time to recover a must, but doing so comes at the expense of productivity.  As humans, when we transition from one task to another – such as from sitting in a meeting to doing normal work – it takes an effortful cognitive switch. We must make a big mental effort to stop the previous task and then expend significant mental energy to move on to the other. Some can bounce back from horrible meetings rather quickly, while others carry their fatigue until the end of the workday. It’s even worse when a worker has several meetings that are separated by only 30 minutes.  While no counter-MRS measures have been tested, Allen says one trick that might work is for employees to identify things or locations that quickly change their mood from negative to positive. As simple as it sounds, finding a personal happy place, going there and then coming straight back to work might be the key to reducing recovery time. Another solution is to ask ourselves if our meetings are even necessary in the first place. If all that’s on the agenda is a quickly catch-up, or some non-urgent information sharing, it may better for managers to send an e-mail to his or her subordinates instead. Most important, however, if for organizations to awaken to the concept of meetings being flexible, says Allen. We have to get rid of the acceptance of meetings as sites of pain, when they should be places of gain.” Allen says. 
8. Which of the following best serves as a title for the passage?

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Aside from the ability to delay normal cognitive decline as we age, there are significant social benefits to lifelong learning. Habitual learners are more likely to put themselves (1) ____ new and challenging social situations throughout life. Learning is by definition a social activity; (2) ____, we often develop connections with other people who have knowledge we would like to learn, or who are equally interested in learning about a new topic. Viewing socialization through the educational lens (3) ____ corresponding results: we are more likely to participate in social engagements as older adults when we are lifetime learners, probably due to the (4) ____ self-esteem that comes with the achievement of a task. Science has shown that aging adults (5) ____ have strong social connections live longer, and lifetime learning is an ideal way to build those support networks

Of the six outer planets, Mars, commonly called the red planet, is the closest to Earth. Mars, 4,200 miles in diameter and 55 percent of the size of Earth, is 34,600,000 miles from Earth, and 141,000,000 miles from the Sun. It takes this planet, along with its two moons, Phobos and Deimos, 1.88 years to circle the Sun, compared to 365 days for the Earth.

For many years, Mars had been thought of as the planet with the man-made canals, supposedly discovered by an Italian astronomer, Schiaparelli, in 1877. With the United States spacecraft Viking I's landing on Mars in 1976, the man-made canal theory was proven to be only a myth.

Viking I, after landing on the soil of Mars, performed many scientific experiments and took numerous pictures. The pictures showed that the red color of the planet is due to the reddish, rocky Martian soil. No biological life was found, though it had been speculated by many scientists. The Viking also monitored many weather changes including violent dust storms. Some water vapor, polar ice, and permafrost (frost below the surface) were found, indicating that at one time there were significant quantities of water on this distant planet. Evidence collected by the spacecraft shows some present volcanic action, though the volcanoes are believed to be dormant, if not extinct.

It can be inferred from the passage that the radius of Mars is_______________ .

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Thousands of emergency service workers battling out of control fires across New South Wales, Australia are bracing for worsening conditions next week. Stopping the spread of fires around the state will be the top priority on Sunday, with weather conditions expected to deteriorate after that.  “Tuesday, particularly, will be a day of concern,” Rural Fire Service spokesman Greg Allan said. “There will be high temperatures, very strong winds, and low humidity.” While no fires reached emergency level on Saturday, Mr Allan stressed that people needed to remain alert. “It’s still a very dangerous situation,” he said.  More than 2 million hectares of bush land has been destroyed by flames this fire season. With RFS Commissioner Shane Fitzsimmons warning the worst might still be ahead. Mr Fitzsimmons said there may not be much respite for tiring firefighters, with no signs of significant rainfall until late January or early February. Over 100 bushfires burned across the state on Saturday, and almost half of them were out of control, with a huge – larger than Sydney – having formed north-west of the city. Another fire at Green Wattle Creek, southwest of Sydney, is still burning uncontrollably, having already destroyed 5400 hectares of bush land. Efforts are being made to keep the situation from getting out of hand. More than 2100 personnel are fighting the fires across the state and a group of 21 specialty firefighters form the US has arrived in Australia, following 21of their Canadian counterparts. While the Canadians are being distributed to the north of the state, the Americans will be assigned to areas in the Sydney Basin or southern New South Wales. Additionally, a total fire ban was in place for eight regions across the state, including Sydney, Far North Coast, Greater Hunter, the Illawarra and Central Rangers. “Right across all fire grounds, our crews, although exhausted, are working extremely hard to slow the spread of fire,” said Mr. Allan. 
4. The word “them” in paragraph 3 refers to __________________

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Up to now, the world has witnessed twenty-one World Cup_________.

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Rome is the capital of Italy. This sprawling modern city has many ancient monuments. Rome’s history goes back more than 2,500 years. Because of its age, Rome is often called the Eternal City. Rome’s many art treasures and historic buildings make the city an important center of European culture. In ancient times, Rome was the center of a mighty Roman empire. The empire lasted nearly 500 years, into the ad 400s. Roman armies conquered the lands that are now Italy, Greece, Great Britain, France, and Egypt. The Romans built many roads from Rome to distant parts of their empire. This network of roads led to a saying that “All roads lead to Rome.” The Roman Empire’s influence is still present. The Romans spread their language, Latin, throughout Europe. Latin is the basis for Italian, French, Spanish, and other European languages. The ancient Romans were great builders. Several of their buildings still stand today. They are among Rome’s famous landmarks.The Pantheon is a temple dedicated to the many Roman gods of mythology. The Roman Colosseum is a four-story amphitheater. An amphitheater is like a football stadium. The Colosseum is where Roman citizens once watched gladiators fight to the death. The Roman Forum was the political center of ancient Rome. The senate building and law courts were there, along with shops and religious buildings. Many artists painted in Rome. The most famous of them is Michelangelo. He lived 500 years ago. Thousands of people visit Rome each year to see his art. Visitors to the Vatican stare in wonder at the beautiful murals that Michelangelo painted on the ceiling of the Sistine Chapel. The murals show scenes from the first book of the Bible, the Book of Genesis. Vatican City is the headquarters of the Roman Catholic Church. The pope lives at the Vatican. He is the head of the Catholic Church. There are more than a billion Catholics worldwide, making Roman Catholicism the largest Christian religion. Vatican City is an independent country within Rome. It is the smallest country in the world.
3. The word “mighty” in paragraph 2 is closest in meaning to ______

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Fairy tales are the stories that adults, especially parents, tell young children. In view of their name, it is surprising that hardly any of them are actually about fairies. (33) ________ most fairy tales have happy endings, the stories usually deal with very (34) ________ situations - children abandoned in the forest, terrifying giants, cruel stepmothers. However, despite being scared when they are told the stories, children will often ask to hear them over and over again. Many psychologists believe that what fairy tales do, in addition to (35) ________ children's  imagination, is to show that there are problems in the world and they can be overcome. Just like adults, children have fears and worries: theirs are of things such as abandonment, loss, injuries, witches. Fairy tales present real problems in a fantasy form (36) ________ children are able to understand. This, it is claimed, allow them to (37) ________ their fears and to realise, if ever in their unconscious mind, that no matter how difficult the circumstances, there are always ways of coping

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Do you ever wish you were more optimistic, someone who always expected to be successful? Having someone around (25) ____ always fears the worst isn’t really a lot of fun - we all know someone who sees a single cloud on a sunny day and says, “It looks like rain”. But if you catch yourself thinking such things, it’s important to do something about it. You can change your view of life, according to psychologists. It only takes a little (26) ____, and you’ll find life more rewarding as a result. Optimism, they say, is partly about self-respect and confidence but it’s also a more (27) ____ way of looking at life and all it has to result offer. Optimists are more likely to start new projects and generally more prepared to take risks. Upbringing is obviously very important (28) ____ forming your attitude to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything goes wrong. Most optimists, on the other hand, have been brought up not to regard failure as the end of the world - they just (29) ____ with their lives

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Botswana, officially the Republic of Botswana, is a country in southern Africa that shares borders with South Africa, Namibia and Zimbabwe. The capital, Gaborone, (1) _______ on the Notwane River in the South east of Botswana. The Kalahari Desert covers more than 70% of Botswana. The Kalahari isn’t a true desert because it rains more each year there than in most (2) _______ deserts. Despite this, Botswana is a dry country. When it does rain, the rain is often heavy and there are floods. Botswana is a popular tourist destination, with people from all over the world coming to see its amazing animals. During the seasonal floods, the land becomes a lush animal habitat. The wide variety of wildlife (3) __________ elephants and lions. Many visit Chobe National Park to see its 70,000 elephants, (4) __________ are the largest of all living elephants. The grassland and river valleys are home to giraffes, cheetahs, hyenas and wild dogs. The baobab tree, an icon of the African savannah, plays an important role in Botswana culture and nearly every part of it is useful. For example, it (5) __________ used to make rope and people pick the leaves to make soup

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Deforestation has important global consequences. Forests sequester carbon in the  form of wood and other biomass as the trees grow, taking up carbon dioxide from the atmosphere. When forests are burned, their carbon is returned to the atmosphere as carbon dioxide, a greenhouse gas that has the potential to alter global climate, and the trees are no longer present to sequester more carbon.  In addition, most of the planet’s valuable biodiversity is within forests, particularly tropical ones. Moist tropical forests such as the Amazon have the greatest concentrations of  animal and plant species of any terrestrial ecosystem; perhaps two-thirds of Earth’s species live only in these forests. As deforestation proceeds, it has the potential to cause the extinction of increasing numbers of these species.  On a more local scale, the effects of forest clearing, selective logging, and fires interact. Selective logging increases the flammability of the forest because it converts a closed, wetter forest into a more open, drier one. This leaves the forest vulnerable to the accidental movement of fires from cleared adjacent agricultural lands and to the killing effects of natural droughts. As wildfires, logging, and droughts continue, the forest can become progressively more open until all the trees are lost. Additionally, the burning of tropical forests is generally a seasonal phenomenon and can severely impact air quality. Record-breaking levels of air pollution have occurred in Southeast Asia as the result of burning for oil palm plantations.  In the tropics, much of the deforested land exists in the form of steep mountain hillsides. The combination of steep slopes, high rainfall, and the lack of tree roots to bind the soil can lead to disastrous landslides that destroy fields, homes, and human lives. With the significant exception of the forests destroyed for the oil palm industry, many of the humid forests that have been cleared are soon abandoned as croplands or only used for lowdensity grazing because the soils are extremely poor in nutrients. The vegetation that contains most of the nutrients is often burned, and the nutrients literally “go up in smoke” or are washed away in the next rain. Although forests may regrow after being cleared and then abandoned, this is not always the case, especially if the remaining forests are highly fragmented. Such habitat fragmentation isolates populations of plant and animal species from each other, making it difficult to reproduce without genetic bottlenecks, and the fragments may be too small to support large or territorial animals. Furthermore, deforested lands that are planted with commercially important trees lack biodiversity and do not serve as habitats for native plants
and animals, many of which are endangered species.
4. Which of the following is NOT true according to paragraph 3?

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Next time your boss asks you to work late and miss your band rehearsal or board game night, point them to a new study in the Journal of Vocational Behavior. Researchers have found that spending more time on a hobby can boost people’s confidence in their ability to perform their job well. Ciara Kelly at Sheffield University and colleagues recruited 129 hobbyists — from amateur climbers to improv comedians — to look at how the time spent on their hobbies shaped their work life. To begin with, the team measured the seriousness of each participant’s hobby, asking them to rate their agreement with statements like “I regularly train for this activity”, and also assessed how similar the demands of their job and hobby were. Then, each month for seven months, participants recorded how many hours they had dedicated to their activity, and completed a scale measuring their belief in their ability to effectively do their job, or their “self-efficacy”, in which they rated themselves on statements like “At work I am able to successfully overcome many challenges”.  The researchers found that when participants spent longer than normal doing their leisure activity, their belief in their ability to perform their job increased. But this was only the case when they had a serious hobby that was dissimilar to their job, or when their hobby was similar to their work but they only did it casually. When their hobby was both serious and similar to their job, then spending more time on it actually had a detrimental effect, decreasing their self-efficacy. Why might that be? To maintain a serious hobby, people need to invest significant psychological resources, so if the activity has the same kinds of demands as their work, they may be left drained and unable to perform as well at their job. But if their hobby is quite different from their career, it may not interfere in the same way but instead help them develop other knowledge and skills that can boost their confidence at work. Of course, the data don’t provide conclusive evidence about the direction of the effect. Still, the results suggest that companies may want to encourage employees to pursue interests outside of work, as long as those activities differ from their day-to-day tasks. And they also may give pause to those who dream of packing it all in and turning their hobby into a career.  
4. The word “self-efficacy” in paragraph 3 is closest in meaning to _______

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy.
Currently, about 80 percent of the information stored on computer systems worldwide is in English. Two-thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers. Today there are more than 700 million English users in the world, and over half of these are non-native speakers, constituting the largest number of non-native users than any other language in the world.

The word “elements” is most similar to    .

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Although television was first regarded by many as “radio with pictures,” public reaction to the arrival of TV was strikingly different from that afforded the advent of radio. Radio in its early days was perceived as a technological wonder rather than a medium of cultural significance. The public quickly adjusted to radio broadcasting and either enjoyed its many programs or turned them off. Television, however, prompted a tendency to criticize and evaluate rather than a simple on-off response. One aspect of early television that can never be recaptured is the combined sense of astonishment and glamour that greeted the medium during its infancy. At the midpoint of the 20th century, the public was properly agog about being able to see and hear actual events that were happening across town or hundreds of miles away. Relatively few people had sets in their homes, but popular fascination with TV was so pronounced that crowds would gather on the sidewalks in front of stores that displayed a working television set or two. The same thing happened in the typical tavern, where a set behind the bar virtually guaranteed a full house. Sports events that might attract a crowd of 30,000 or 40,000 suddenly, with the addition of TV cameras, had audiences numbering in the millions. By the end of television’s first decade, it was widely believed to have greater influence on American culture than parents, schools, churches, and government-institutions that had been until then the dominant influences on popular conduct. All were superseded by this one cultural juggernaut. The 1950s was a time of remarkable achievement in television, but this was not the case for the entire medium. American viewers old enough to remember TV in the ’50s may fondly recall the shows of Sid Caesar, Jackie Gleason, Milton Berle, and Lucille Ball, but such high-quality programs were the exception; most of television during its formative years could be aptly described, as it was by one Broadway playwright, as “amateurs playing at home movies.” The underlying problem was not a shortage of talented writers, producers, and performers; there were plenty, but they were already busily involved on the Broadway stage and in vaudeville, radio, and motion pictures. Consequently, television drew chiefly on a talent pool of individuals who had not achieved success in the more popular media and on the young and inexperienced who were years from reaching their potential. Nevertheless, the new medium ultimately proved so fascinating a technical novelty that in the early stages of its development the quality of its content seemed almost not to matter. Fortunately, the dearth of talent was short-lived. Although it would take at least another decade before areas such as news and sports coverage approached their potential, more than enough excellence in the categories of comedy and drama emerged in the 1950s to deserve the attention of discriminating viewers. They are the most fondly remembered of the Golden Age genres for both emotional and intellectual reasons. Live TV drama was, in essence, the legitimate theatre’s contribution to the new medium; such shows were regarded as “prestige” events and were afforded respect accordingly. The comedies of the era are remembered for the same reason that comedy itself endures: human suffering and the everelusive pursuit of happiness render laughter a necessary palliative, and people therefore have a particular fondness for those who amuse them  
3. According to paragraph 2, why would the public gather on the sidewalks in front of stores?

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Urban development is having a direct impact on the weather in (1) ______ cities worldwide. It has been noticed that the difference in temperature is usually greater at night and the phenomenon occurs in both winter and summer. Experts agree that this is due to urban development, when open green spaces are replaced with asphalt roads and tall brick or concrete buildings. These materials retain heat generated by the Sun and release it through the night. In Atlanta, in the US, this has even led to thunderstorms (22) ______ occur in the morning rather than, as is more common, in the afternoon. Large cities around the world are adopting strategies to combat this issue, (3) ______ it is not uncommon to find plants growing on top of roofs or down the walls of large buildings. In Singapore, the government has (4) ______ to transform it into a "city within a garden" and, in 2006, they held an international competition calling for entries to develop a master plan to help bring this about. One outcome was the creation of 18 "Supertrees" – metal constructions resembling very tall trees. Each one is a vertical freestanding garden and is (5) ______ to exotic plants and ferns. They also contain solar panels used to light the trees at night and also containers to collect rainwater, making them truly self-sufficient

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The human desire for companionship may feel boundless, but research suggests that  our social capital is finite. Social scientists have used a number of ingenious approaches to gauge the size of people’s social networks; these have returned estimates ranging from about 250 to about 5,500 people. An undergraduate thesis from MIT focusing exclusively on Franklin D. Roosevelt, a friendly guy with an especially social job, suggested that he might have had as many as 22,500 acquaintances. Looking more specifically at friendship, a study using the exchange of Christmas cards as a proxy for closeness put the average person’s friend group at about 121 people.  However vast our networks may be, our inner circle tends to be much smaller. The average American trusts only 10 to 20 people. Moreover, that number may be shrinking: From 1985 to 2004, the average number of confidants that people reported having decreased from three to two. This is both sad and consequential, because whoever has strong social relationships tends to live longer than those who don’t. So what should you do if your social life is lacking? Just follow the research. To begin with, don’t dismiss the humble acquaintance. Even interacting with people with whom one has weak social ties has a meaningful influence on well-being. Beyond that, building deeper friendships may be largely a matter of putting in time. A recent study out of the University of Kansas found that it takes about 50 hours of socializing to go from acquaintance to casual friend, an additional 40 hours to become a “real” friend, and a total of 200 hours to become a close friend. If that sounds like too much effort, reviving dormant social ties can be especially rewarding. Reconnected friends can quickly recapture much of the trust they previously built, while offering each other a dash of novelty drawn from whatever they’ve been up to in the meantime. And if all else fails, you could start randomly confiding in people you don’t know that well in hopes of letting the tail wag the relational dog. The academic literature is clear: Longing for closeness and connection is pervasive. Which suggests that most of us are stumbling through the world pining for companionship that could be easily provided by the lonesome stumblers all around us.
7. The following statements are true, EXCEPT _______

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Elephants need a large amount of habitat because they eat so much. Humans have become their direct competitors for living space. Human populations in Africa and Asia have quadrupled since the turn of the century, the fastest growth rate on the planet. Forest and savanna habitat has been converted to cropland, pastureland for livestock, and timber for housing and fuel. Humans do not regard elephants as good neighbors. When humans and elephants live close together, elephants raid crops, and rogue elephants rampage through villages. Local people shoot elephants because they fear them and regard them as pests. Some countries have established culling programs: park officials or hunters kill a predetermined number of elephants to keep herds manageable and minimize human-elephant conflicts. Hunting has been a major cause of the decline in elephant populations. Elephants became prized trophies for big-game hunters after Europeans arrived in Africa. More recently, and more devastatingly, hunters have slaughtered elephants for their ivory tusks. The ivory trade became a serious threat to elephants in the 1970s. A sudden oil shortage caused the world economy to collapse, and ivory became more valuable than gold. In fact, ivory has been called “white gold” because it is beautiful, easily carved, durable, and pleasing to the touch. Most of the world’s ivory is carved in Japan, Hong Kong, and other Asian countries, where skilled carvers depend on a supply of ivory for their livelihoods  Hunting elephants is no longer legal in many African countries, but poaching was widespread until very recently. For many the high price of ivory, about $100 a pound in the 1980s, was too tempting to resist. Local people often had few other ways to make a living, and subsistence farmers or herders could make more by selling the tusks of one elephant than they could make in a dozen years of farming or herding. As the price of ivory soared, poachers became more organized, using automatic weapons, motorized vehicles, and airplanes to chase and kill thousands of elephants. To governments and revolutionaries mired in civil wars and strapped for cash, poaching ivory became a way to pay for more firearms and supplies. Poaching has caused the collapse of elephants’ social structure as well as decimating their numbers. Poachers target the biggest elephants because their tusks are larger. They often kill all the adults in the group, leaving young elephants without any adults to teach them migration routes, dry-season water sources, and other learned behavior. Many of Africa’s remaining elephant groups are leaderless subadults and juveniles.
3. According to the second paragraph, culling programs have been established as a method to ______.

Find synonym:
Here are some principles for people to stick to if they want to stay healthy.

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The aviation industry, especially the commercial aviation sector, is constantly striving to improve both the way it works and its customer satisfaction. It has begun using artificial intelligence. Though AI in the aviation industry is still in the nascent stage, some progress has been made already as certain leading carriers invest in AI. To make a long story short, AI can redefine how the aviation industry goes about its work. In 2017, American Airlines conducted an app development competition with the goal of having an app developed for making baggage screening easier for passengers. The competition, named HackWars, was themed upon artificial intelligence, drones and augmented and virtual reality. The winner, known as “Team Avatar,” developed an app that would not only allow passengers determine their baggage size before arriving at the airport, but also prepay any potential baggage-related expenses. United Airlines is using Amazon’s Alexa to have certain common customer queries answered. In September 2017, United announced a collaboration with Alexa. The feature is known as the United skill. To get started, all passengers need to do is to  add the United skill to their Alexa app and then start asking questions. Alexa answers common queries correctly, such as the status of a flight by number, check-in requests and availability of Wi-Fi on a flight. The reviews so far have been mixed, which points to the fact that there is a learning curve, and it is still a long way to go before AI can fully handle customer assistance. Tracking progress is an enormous challenge that airlines will face. The first thing they need to do is to develop analytics that will help them develop and process accurate data. However, that in itself is a challenge. What kind of analytics will help? For example, customer satisfaction is going to be one of the most important factors in success. What kind of analytics will determine that airlines have been improving on customer satisfaction parameters? AI needs huge investments, and probably the biggest risk in this is smaller, especially budget airlines are going to miss out on reaping the benefits of AI fully. Does that mean that the performance of the smaller carriers will be impacted? That might not be the case, because we might be moving toward more acquisitions and mergers. Bigger airlines will have a massive appetite for acquiring smaller airlines with an eye on the market. It is not all gloom and doom though, because smaller airlines like Southwest have already shown some initiatives toward embracing AI. It is surprising that a sector as important as aviation has woken up to AI so late. As AI in aviation picks up its pace, there could probably be a few mergers, acquisitions or even closure of small airlines which will not be able to afford the investments. Now, AI seems the best option to take aviation to the next level.
1. What is author’s main idea in the passage?

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Don't confess your love to your friends unless you know they feel the same way.