Choose the best answer:
This drink isn't beneficial for health. You ____ drink it too much.

 

Read the following passage and choose the best answer (A, B, C, D):
In 1860 the United States was predominantly rural. Most people were engaged in  agriculture, and about 80 percent of the population actually resided on farms or in small villages. Only 20 percent lived in towns and cities of 2,500 or more, the census definition of an urban area after 1880. New York alone in 1860 had more than 1 million people, and only 8 cities could boast about a population of more than 100,000. Thereafter the transition from a rural to a predominantly urban nation was especially remarkable because of its speed. By 1900, urbanization, with all of its benefits, problems, and prospects for a fuller life, became the mark of modern America The changing physical landscape reflected the shift to an urbanized society. Railroad terminals, factories, skyscrapers, apartment houses, streetcars, electric engines, department stores, and the increased pace of life were all signs of an emerging urban America. Indeed, the vitality, dynamic quality, variety, and restless experimentalism in society centered in the urban communities where the only constant factor was change itself.  Urbanization did not proceed uniformly throughout the nation. New England and the Middle Atlantic states contained the highest percentage of city dwellers. In the Middle West, the growth of cities such as Chicago, Milwaukee, Cleveland, and St. Louis showed the importance of urbanization in that region. The three West Coast states also experienced rapid urban growth. In the South, urbanization developed much more slowly, although by 1910 the expansion of transportation, commerce, and industry had greatly increased the population of older cities such as New Orleans and stimulated the growth of new urban centers such as Birmingham. However, the South remained predominantly rural. Only somewhat more than 20 percent of the population in that region was urban by 1910.  In some regions the urban impact had a depressing effect upon the surrounding rural communities. Much of New England in the late nineteenth century presented a discouraging picture of abandoned farms and sickly villages as people forsook the countryside and rushed to the larger towns and cities. In the Middle West, particularly Ohio and Illinois, hundreds of townships lost population in the 1880’s.
2. According to the passage, which of the following was the census definition of an urban area after 1880?

Read the following passage and choose the best answer (A, B, C, D):
Modern society has given significant attention to the promises of the digital economy over the past decade. But it has given little attention to its negative environmental footprint. Our smartphones rely on rare earth metals, and cloud computing, data centers, artificial intelligence and cryptocurrencies consume large amounts of electricity, often sourced from coal-fired power plants. These are crucial blind spots we must address if we hope to capture the full potential of the digital economy. Without urgent system-wide actions, the digital economy and green economy will be incompatible with each other and could lead to more greenhouse gas emissions, accelerate climate change and pose great threats to humanity. The world’s data centers-the storehouses for enormous quantities of information - consume about three percent of the global electricity supply (more than the entire United Kingdom), and produce two percent of global greenhouse gas emissions-roughly the same as global air travel. A report by Greenpeace East Asia and the North China Electric Power University found that China’s data centers produced 99 million tonnes of carbon dioxide in 2018, the equivalent of about 21 million cars driven for one year. Greenhouse gases aren’t the only type of pollution to be concerned about.Electronic waste (e-waste), which is a byproduct of data center activities, accounts for two percent of solid waste and 70 percent of toxic waste in the United States. Globally, the world produces as much as 50 million tonnes of electronic e-waste a year, worth over US$62.5 billion and more than the GDP of most countries. Only 20 percent of this e-waste is recycled. The world and its intractable challenges are not linear-everything connects to everything else. We must raise awareness about these major blind spots, embrace systems leadership (leading across boundaries), boost circular economy ideas (decoupling economic activity from the consumption of finite resources), leverage an eco-economics approach (an environmentally sustainable economy) and encourage policy-makers to explore the interrelationships between government-wide, system-wide and societal results. We must also consider collective problem-solving by bringing together diverse perspectives from both the Global North and the Global South. We should take an inventory of the global and local damages caused by electronic devices, platforms and data systems, and frame issues about the digital economy and its environmental impact in broad societal terms.
3. According to paragraph 2, what is the overall concern for the bilateral relationship between technology and nature?

Read the following passage and then choose the best answer.

Communication in general is process of sending and receiving messages that enables humans to share knowledge, attitudes, and skills. Although we usually identify communication with speech, communication is composed of two dimensions - verbal and nonverbal.

Nonverbal communication has been defined as communication without words. It includes apparent behaviors such as facial expressions, eyes, touching, tone of voice, as well as less obvious messages such as dress, posture and spatial distance between two or more people.

Activity or inactivity, words or silence all have message value: they influence others and these others, in turn, respond to these communications and thus they are communicating.

Commonly, nonverbal communication is learned shortly after birth and practiced and refined throughout a person's lifetime. Children first learn nonverbal expressions by watching and imitating, much as they learn verbal skills.

Young children know far more than they can verbalize and are generally more adept at reading nonverbal cues than adults are because of their limited verbal skills and their recent reliance on the nonverbal to communicate. As children develop verbal skills, nonverbal channels of communication do not cease to exist although become entwined in the total communication process.

Which is not included in nonverbal communication?

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All birds have feathers, and feathers are unique to birds. No other major group of animals is so easy to categorize. All birds have wings, too, but wings are not (1) ___________ to birds. Many adaptations are found in both feathers and wings. Feathers form the soft down of geese and ducks, the long showy plumes of ostriches and egrets, and the strong flight feathers of eagles and condors. Wings (2) _____________ from the short, broad ones of chickens, who seldom fly, to the long slim ones of albatrosses, who spend almost all their lives soaring on air currents. In penguins, wings have been modified (3) ________ flippers, and feathers into a waterproof covering. In kiwis, the wings are almost impossible to detect. Yet diversity among birds is no so striking as it is among mammals. The (4) ___________ between a hummingbird and a penguin is immense, but hardly as startling as that between a bat and a whale. It is variations in details rather than in fundamental patterns (5) _____________ have been important in the adaptation of birds to many kinds of ecosystems

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

   As viewed from space, Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million kilometers (93 million miles), Earth is the third planet from the Sun and the fifth largest planet in the solar system.

   Our planet’s rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Earth’s atmosphere protects us from meteors as well, most of which burn up in the Earth’s atmosphere before they can strike the surface. The planet active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it formed about 4.6 billion years ago. The Earth has a single natural satellite – the moon.

The word distinguishing as it is used in this selection means ________.

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There is a scam aimed at a child’s desire to be a published writer - usually as a poet, in a book of poems. How does the scam work? Keen teachers are unwittingly caught up in the promotion but are completely unaware of the dodgy side of the scheme. There are plenty of honest opportunities for children’s writing that don’t cost their parents a small fortune and provide a poor-quality product. Most books in scams are badly set out. They tend to be huge volumes, squashing in as many writers’ efforts as possible to make as much money as possible. They’re an embarrassment for the young poets. These competitions to discover hidden talent sound great in the glossy flyers. Schools too are offered a prize if a winner is from their school. Schools become unpaid ‘agents’ in promotion of the competitions. Parents are happy to pay a small entry fee. Each child hopes to get an ‘honourable mention’ with the possibility of being selected to be included in a book. The price of the book is not given. Naturally, if a child’s work were published, parents would want a copy of the book. In one such scheme the pre-order price was $67 with an extra $26 if the child’s photo was included. That’s nearly $100! Strangely, awards are given to those who pre-order a book! The books are not attractive. A copy at a market sold for $2. There were three to five kids’ poems squashed on a page, with over 3000 poems jammed into that one book. Clip Art was used to illustrate the poor publication. Look at the maths. 3000 kids multiplied by $100 equals $300 000. Now add the entry fees of, say, $2 - add another $6000! Enough to cover publicity! One place winner’ was upset when the parents realised this was a con to buy a book, but not buying the book made the parents feel guilty. Genuine competitions that publish books give a free copy to any ‘winner’ 
1. According to the passage, a scam is ____

Choose the best answer:
The Thang Long Imperial Citadel was the ………. of political power for nearly seven centuries without interruption.

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Common methods of deforestation are burning trees and clear cutting. These tactics leave the land completely barren and are controversial practices. Clear cutting is when large swaths of land are cut (1) ______ all at once. A forestry expert quoted by the Natural Resources Defense Council describes clear cutting as “an ecological trauma that has no precedent in nature (2) _____ for a major volcanic eruption.” Burning can be done quickly, in vast swaths of land, or more slowly with the slash-andburn technique. Slash-and-burn agriculture entails cutting down a patch of trees, (3) __________ them and growing crops on the land. The ash from the (4) _____ trees provides some nourishment for the (5) ______ and the land is weed-free from the burning. When the soil becomes less nourishing and weeds begin to reappear over years of use, the farmers move on to a new patch of land and begin the process again

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Go is a game that has been around for 3000 years. It is widely accepted as the most challenging strategy game that exists. It takes years of playing for several hours every day to master the game. In other words, even though it has simple rules, it is not a simple game to excel at. Surprise! Deep Mind managed to create a machine that could master the game, without being programmed with explicit rules and without being taught by a professional Go player. AlphaGo mainly played against itself and learned from this self-play. At its core, it learned like a human learns, by looking at the board, evaluating the options, making moves, and learning from mistakes - it just did it a lot faster than any human can. This is extremely exciting because, at its core, what it means is that computer scientists have had all the tools they needed to do this for years. Neural networks have been known about and discussed since the middle of the last century. All it really took was simply getting creative with them, applying them in new ways. AlphaGo beating the world’s best Go player proves that AI has the potential to do anything. It can learn anything and understand anything, and from that learning and understanding it can accomplish what humans can accomplish in a much shorter period of time. You’re probably wondering what this all means. We’re much closer to the dream of an AI best friend than most of us would have dared to imagine a few years ago. AlphaGo can learn the most complex, intuition and creativity based logic game known to man and it didn’t do so through a finite database or search trees alone. It learned from practice and experience, just like we do, and the ability to create amazing new solutions to ancient puzzles suggests a realm of digital creativity never before fathomed. AlphaGo is not like other game playing AIs that have come before it. It is the future of intelligent and intuitive machines, one that we plan to turn toward more than just board games. From practical applications to that friend you’ve been hoping for, AlphaGo is sure to be the first of a new generation of self-learning intuitive AIs that go above and beyond the limited calculating capacities of its older siblings and contemporaries. The AI winter is over.
5. The word “realm” in paragraph 3 is closest in meaning to _______

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An integral part of human life is the sports. As we all know, many competitive and  entertaining activities are engaged in sports. A sport is a way to stay fit and healthy. If we want to be physically fit we have to have an active life to stay healthy, so it is always a good idea to participate in sports and games.  The sport has inherent discipline and physical demands so that enthusiasts tend to maintain a healthy lifestyle. Weight loss, more energy, better mobility and a lot of things can come from the sport. All of this can describe a good person’s health. People are taught by sports and games to appreciate their health. The energy and vitality necessary to participate cannot be sustained without health. For professional athletes, their fitness and health depend on their livelihood. Sport also aims to keep individuals in good health and endurance.  Water is the most important nutrient that we cannot live without. If you do sports, you tend to sweat more thus increase your metabolic rate. If you do not replace these fluids, you can have very serious health problems or you can even die. To have a healthy and active body we need to eat essential nutrients. Participating in sports activities will encourage you to drink more water since we develop the urge to do so when we participate in physical activities.  When participating in sports activities we come to learn new things. It makes us learn how to tackle things the difficult situation. Sports develop a sense of unity and brotherliness. It develops team spirit in us. It helps in developing mental and physical toughness. It improves our efficiency. With our day-in-day-out activities, we tend to become exhausted the more reason we need sports in our lives to help us forget stressful things we go through. Everybody should always play a sport once a week to keep themselves fit and healthy. Sport is a fundamental phase for a child who is learning. In education, it helps the students keep their value in life, students are taught various games in the very early stage of life at school. Nurturing sports talents from school encourages a lot of talented children and it affirms the sportsmanship in them. Those students who perform well are promoted to play at the national and international level. Sports can be a carrier developing option for many students.  As we know, a physical activity governed by a set of rules or habits is called sport. Sport is often involved in the competition. The sport was originally developed for recreation. When people want to do the distraction or recovery, they usually do sports, sports games or skill tests. From this, we can conclude that sport has large and varied manifestations.  Sport can be played indoors or outdoors. It can be done by individual or team, with or without competition. And we know that sport requires skill and physical effort. The growth and development of sport and its related industries were witnessed by modern sport. Because we know that a healthy person is a wealthy person, the sport is the secret of both health and prosperity. 
5. The word “tackle” in paragraph 4 can be best replaced by ______

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:
It is said that George Washington was one of the first to realize how important tire building of canals would be to the nation’s development. In fact, before he became the President, he headed the first company in the United States to build a canal, which was to connect the Ohio and Potomac rivers. It was never completed, but it showed the nation the feasibility of canals. As the country expanded westward, settlers in western New York, Pennsylvania, and Ohio needed a means to ship goods. Canals linking natural waterways seemed to supply an effective method.
In 1791, engineers commissioned by the state of New York investigated the possibility of a canal between Albany on the Hudson River and Buffalo on Lake Eric to link the Great Lakes area with the Atlantic seacoast. It would avoid the mountains that served as a barrier to canals from the Delaware and Potomac rivers.
The first attempt to dig the canal, to be called the Eric Canal, was made by private companies but only a comparatively small portion was built before the project was halted for lack of funds. The cost of the prospect was estimated $5 million, an enormous amount for those days. There was some on-again-off-again federal funding, but this time the War of 1812 put an end to construction. In 1817, DeWitt Clinton was elected Governor of New York and persuaded the state to finance and build the canal. It was completed in 1825, costing S2 million more than expected.
The canal rapidly lived up to its sponsors’ faith, quickly paying for itself through tolls. It was far more economical than any other form of transportation at the time. It permitted trade between the Great Lake region and the East coast, robbing the Mississippi River of much of its traffic. It allowed New York to supplant Boston, Philadelphia, and other eastern cities as the chief center of both domestic and foreign commerce. Cities sprang up along the canal. It also contributed in a number of ways to the Norths victory over the South in the Civil War.
An expansion of the canal was planned in 1849. Increased traffic would undoubtedly have warranted its construction had it not been for the railroads.

The word “tolls” in paragraph 4 is closest in meaning to which of the following?

Choose the best answer:
seeing/ I/ London/ London Eye/ in/ enjoy/ the

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Air pollution is the most prominent and dangerous form of pollution. It occurs dues to many reasons. Excessive burning of fuel which is a necessity of our daily lives for cooking, driving and other industrial activities releases a huge amount of chemical substances in the air every day; as a result, these pollute the air. Smoke from chimneys, factories, vehicles or burning of wood basically occurs due to coal burning. This releases sulphur dioxide into the air making it toxic. The effects of air pollution are evident too. Release of sulphur dioxide and hazardous gases into the air causes global warming and acid rain which in turn have increased temperatures, erratic rains and droughts worldwide making it tough for animals to survive. We breathe in every polluted particle from the air, the result is an increase in asthma and cancer in the lungs. Another effect of air pollution is ozone layer depletion. Ozone layer is the thin shield high up in the sky that prevents ultra violet rays from reaching the Earth. As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs) which play a key role, were released into the atmosphere which contributed to the destruction of ozone layer. Water pollution has taken toll of all the surviving species of the earth. Almost 60% of the species live in water bodies. It occurs due to several factors; the industrial wastes dumped into the rivers and other water bodies cause an imbalance in the water leading to its severe contamination and death of aquatic species. If you suspect that nearby water sources have been contaminated by a corporation then it might be a good idea to hire an expert to see you options. Moreover, spraying insecticides, pesticides like DDT on plants also pollutes the ground water system and oil spills in the oceans have caused irreparable damage to the water bodies. Eutrophication is another big source; it occurs due to daily activities like washing clothes or utensils near lakes, ponds or rivers; this forces detergents to go into water which blocks sunlight from penetrating, thus reducing oxygen and making it inhabitable. Water pollution not only harms the aquatic beings but it also contaminates the entire food chain by severely affecting humans dependents on these. Waterborne disease like cholera, diarrhea have also increased in all places. Another type of pollution common in the countryside is soil pollution. Soil pollution occurs due to the incorporation of unwanted chemicals in the soil due to human activities. Insecticides and pesticides absorb the nitrogen compounds in the soil making it unfit for plants to derive nutrition. Release of industrial waste, mining and deforestation also damages the soil. Since plants can’t grow properly, they can’t hold the soil and this leads to soil erosion.
3. What is possibly the main factor that damages the ozone layer according to the passage?

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Far from being barren wastelands, deserts are biologically rich habitats with a vast  array of animals and plants that have adapted to the harsh conditions there. Some deserts are among the planet’s last remaining areas of total wilderness. Yet more than one billion people, one-sixth of the Earth’s population, actually live in desert regions.  Deserts cover more than one fifth of the Earth’s land, and they are found on every continent. A place that receives less than 10 inches (25 centimeters) of rain per year is considered a desert. Deserts are part of a wider classification of regions called “dry lands.” These areas exist under a moisture deficit, which means they can frequently lose more moisture through evaporation than they receive from annual precipitation.  And despite the common conceptions of deserts as dry and hot, there are cold deserts as well. The largest hot desert in the world, northern Africa’s Sahara, reaches temperatures of  up to 122 degrees Fahrenheit (50 degrees Celsius) during the day. But some deserts are always cold, like the Gobi desert in Asia and the desert on the continent of Antarctica. Others are mountainous. Only about 10 percent of deserts are covered by sand dunes. The driest deserts get less than half an inch (one centimeter) of precipitation each year, and that is from condensed fog not rain.  Desert animals have adapted ways to help them keep cool and use less water. Camels, for example, can go for days without food and water. Many desert animals are nocturnal, coming out only when the brutal sun has descended to hunt. Some animals, like the desert tortoise in the south-western United States, spend much of their time underground. Most desert birds are nomadic, crisscrossing the skies in search of food. Because of their very special adaptations, desert animals are extremely vulnerable to introduced predators and changes to their habitat.  Some of the world’s semi-arid regions are turning into desert at an alarming rate. This process, known as “desertification,” is not caused by drought, but usually arises from the demands of human populations that settle on the semi-arid lands to grow crops and graze animals. The pounding of the soil by the hooves of livestock may degrade the soil and encourage erosion by wind and water.
2. It is assumed that deserts are _____

Read the following passage and choose the best answer (A, B, C, D):
Leisure reading, also known as recreational reading, pleasure reading, free voluntary reading, and independent reading, is independent, self-selected reading of a continuous text for a wide range of personal and social (1)__________. It can take place in and out of school, at any time. Readers (2)__________from a wide range of extended texts, including but not exclusive to narrative fiction, nonfiction, picture books, e-books, magazines, social media, blogs, websites, newspapers, comic books, and graphic novels. Leisure reading is (3)_______intrinsically or socially motivated and a pleasurable activity for the reader. Students’ home environment, where parents/caregivers encourage reading and model their enjoyment of reading, has a substantial (4)___________impact on children’s performance in reading. In classrooms, leisure reading often takes place during times designated as SSR (sustained silent reading), DEAR (drop everything and read), LTR (love to read), or POWER (providing opportunities with everyday reading), which are the most common terms for classroom leisure reading. It may take place (5) _____individual classrooms or be part of a school-wide activity

Read the following passage and choose the best answer (A, B, C, D):
In 1988, a year before the Soviet Union collapsed, the 13th National Congress of the  Communist Party of Vietnam adopted a resolution to have “more friends and fewer enemies”. So it was not surprising when Vietnam expressed interest in joining ASEAN as early as 1992, or when it did in fact join in July 1995.   Vietnam’s membership of the grouping integrated its security with the whole of Southeast Asia and created a favourable environment for economic development. This, in turn, raised Vietnam’s global image, leading to increased cooperation with multiple players in the region and greater bargaining clout with super powers like the United States and China. As an ASEAN member, Vietnam has worked hard to secure peace and reconciliation among Southeast Asian nations, which were once deeply divided by war. Vietnam was the first Indochinese country to join ASEAN, and its move helped end confrontation between the Indochinese bloc and ASEAN. Vietnam has also helped ASEAN partner with non-regional players.  Vietnam also led efforts within ASEAN to ensure regional security. Soon after becoming a member, Vietnam signed the Treaty on the Southeast Asian Nuclear-WeaponFree Zone and was one of the founding members of the ASEAN Regional Forum. But the most proactive steps by Hanoi towards regional stability have revolved around disputes in the South China Sea. A direct claimant in the dispute, Vietnam, along with the Philippines, has made constant efforts to put the South China Sea on ASEAN’s agenda, ensuring conflict is dealt with in a constructive way. Vietnam has shown constant support for the Declaration on the Conduct of Parties in the South China Sea, ASEAN’s Six-Point Principles on the East Sea, and the soon-to-be-concluded Code of Conduct of Parties in the East Sea. Vietnam calls for the settlement of disputes by peaceful means on the basis of international law and the 1982 United Nations Convention on the Law of the Sea — including through regulations on respecting exclusive economic zones and the continental shelf of coastal countries. Vietnam has remained committed to ASEAN since it joined in 1995 and Vietnam is beginning to integrate further with the global community, and  cooperation with ASEAN will always be an important pillar in its foreign policy. But Vietnam’s interest in ASEAN is not
limited to security issues. Its leadership also drives efforts toward an ASEAN Economic Community (AEC). 
7. What will the next paragraph of the passage possibly discuss?

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Geothermal energy is the heat from the Earth. It’s clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth’s surface, and down even deeper to the extremely high temperatures of molten rock called mác-ma. Almost everywhere, the shallow ground or upper 10 feet of the Earth’s surface maintains a nearly constant temperature between 50° and 60°F (10° and 16°C). Geothermal heat pumps can tap into this resource to heat and cool buildings. A geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building. In the winter, the heat pump removes heat from the heat exchanger and pumps it into the indoor air delivery system. In the summer, the process is reversed, and the heat pump moves heat from the indoor air into the heat exchanger. The heat removed from the indoor air during the summer can also be used to provide a free source of hot water. In the United States, most geothermal reservoirs of hot water are located in the western states, Alaska, and Hawaii. Wells can be drilled into underground reservoirs for the generation of electricity. Some geothermal power plants use the steam from a reservoir to power a turbine/generator, while others use the hot water to boil a working fluid that vaporizes and then turns a turbine. Hot water near the surface of Earth can be used directly for heat. Direct-use applications include heating buildings, growing plants in greenhouses, drying crops, heating water at fish farms, and several industrial processes such as pasteurizing milk. Hot dry rock resources occur at depths of 3 to 5 miles everywhere beneath the Earth’s surface and at lesser depths in certain areas. Access to these resources involves injecting cold water down one well, circulating it through hot fractured rock, and drawing off the heated water from another well. Currently, there are no commercial applications of this technology. Existing technology also does not yet allow recovery of heat directly from mác-ma, the very deep and most powerful resource of geothermal energy 
6. What is the main information of the last paragraph?

Rewrite the sentence
He likes the dress. Huong is wearing it.

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:
In the USA, the UK and many other countries, a lot of babies were born in the “baby boom” of the late 1940s and 1950s; after that the birth-rate fell. Baby boomers have now retired, or are approaching retirement, and this is causing headaches for many organizations: there are not enough people to succeed their top managers when they retire.
Does your organization have key staff who can’t easily be replaced? A CEO or financial director, perhaps, or a technical expert with knowledge that nobody else in the organization has. If your answer is “yes”, what will happen when they retire, or leave for another company? Will you wait until the last moment before looking for someone to replace them? Or is your organization thinking about likely future changes now, as it should be, and making plans, so that there is likely to be someone ready to replace the person leaving? If the answer is that you are planning ahead, your organization is carrying out succession planning.
Succession planning means looking inside the organization for “high-fliers” - current staff members with the potential to fill key positions - and planning the training, responsibilities and promotion they need, to make them ready when a senior vacancy occurs - which may not be for several years. The company benefits by being able to make an internal promotion when a key person leaves, and in the meantime it benefits by developing the skills of its high-fliers and encouraging them to stay. And the high-fliers benefit, because they achieve their full potential, a career is planned for them within the organization, and they can look forward to a senior post in time.
The training program planned for the high-fliers will help them to develop the leadership skills they need for more senior roles, skills such as planning long-term strategies. A career path is also planned, so that each high-flier moves into a number of different positions over a few years, to gain the experience and know ledge they need.
Sometimes a staff member is chosen as a potential successor to a particular senior manager, but a better method is for organizations to select a number of high-fliers, and prepare them for a range of senior roles. An organization can’t be certain when a particular senior manager will leave. Having a group of people being prepared fee top positions makes it easier to replace someone who leaves unexpectedly, and also means that there are other people available if a high-flier leaves the company.

What does the word “them” in the 3rd paragraph refer to?

Read the following passage and choose the best answer (A, B, C, D):
Rachel Carson was born in 1907 in Springdale, Pennsylvania. She studied biology in college and zoology at Johns Hopkins University, where she received her master's degree in 1933. In 1936, she was hired by the US Fish and wildlife service, where she worked most of her life. Carson's first book, Under the Sea Wind, was published in 1941. It received excellent reviews, but sales were poor until it was reissued in 1952. In that year, she published The Sea Around Us, which provided a fascinating look beneath the ocean's surface, emphasizing human history as well as geology and marine biology. Her language had a poetic quality. Carson consulted no less than 1,000 printed sources. She had voluminous correspondence and frequent discussions with experts in the field. However, she always realized the limitations of her non-technical readers. In 1962, Carson published Silence Spring, a book that sparked considerable controversy. It proved how much harm was done by the uncontrolled, reckless use of insecticides. She detailed how they poison the food supply of animals, kill birds, and contaminate human food. At that time, spokes men for the chemical industry mounted personal attacks against Carson and issued propaganda to indicate that her findings were flawed. However, her work was vindicated by a 1963 report of the President's Science Advisory Committee.
1. The passage mainly discusses Rachel Carson's work: