Each sentence has a mistake. Findit by chosing A B C or D

 As the highest moutain on Earth, the Mount Everest represents the ultimate challenge for moutain climbers

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Vocational training in the UK is intended to give people the skills and knowledge they  need to perform a particular job, and involves practical instruction as well as theory. Most vocational training takes place not in universities but in colleges of further education and in colleges specializing in art, accountancy, etc. some secondary schools now also offer an introduction to vocational training.  NVQs (National Vocational Qualifications) are qualifications that can be obtained by people already working in a particular industry. Colleges of further education run courses to provide a theoretical background. NVQs are awarded on the basis of practical work, spoken and written test, and coursework. There are five levels, from Foundation to Management. Since 1992 many students in schools and colleges have been working for GNVQs (General National Vocational Qualifications), as an alternative to GCSEs and A levels. GNVQs cover similar areas to NVQs and are intended as introductions to a particular field of work and the skills required. Students can choose from over 500 subjects. At the lowest of its three levels foundation, a GNVQ is equivalent to a GCSE and from 2002 they are being replaced by new vocational GCSEs.  In the US there are no national qualifications like NVQs, though some professional organizations decide on their own qualifications and some of these have become widely accepted. Much vocational training is done by private institutions which are sometimes called proprietary schools. Although many of these are good, in general they have a bad reputation. This is partly because there are no controls over who can operate such a school. Some proprietary schools try to get as many students as possible, including some who will probably not be able to complete their training.  Most US secondary schools programs do not provide a choice between an academic and a practical track (a program of study), but most do give students an opportunity to take some practical or vocational classes. Large school districts may have magnet schools, schools that attract students with certain interests, and some of these may have a large choice of vocational courses.  
5.  It can be inferred from the reading about the vocational training in the US that _______

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She had worked as a tourist guide before __________ a teaching career.

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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 
3. The phrasal verb “consists of” in paragraph 2 can be best replaced by ______

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Visual/ pollution/ prevent/ us/ see/ far/ away.

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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.
8. Which of the following can be inferred from the passage?

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“Where is the university?” is a question many visitors to Cambridge ask, but no one can give them a clear answer, for there is no wall to be found around the university. The university is the city. You can find the classroom buildings, libraries, museums and offices of the university all over the city. And most of its members are the students and teachers or professors of the thirty- one colleges. Cambridge is already a developing town long before the first students and teachers arrived 800 years ago. It grew up by the river Granta, as the Cam was once called. A bridge was built over the river as early as 875.
In the fourteenth and fifteenth centuries, more and more land was used for college buildings. The town grew faster in the nineteenth century after the opening of the railway in 1845. Cambridge became a city in 1951 and now it has the population of over 100000. Many young students want to study at Cambridge. Thousands of people from all over the world come to visit the university town. It has become a famous place all around the world.

Why did people name Cambridge the “city of Cambridge”?

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Birds are even more disrupted by their noisy neighbours than had been thought  previously, researchers have found. And human activities could be preventing birds from reproducing and even developing normal social behaviour and keeping the peace.  A study by Queen’s University Belfast found that when European robins were subjected to human produced noises their behaviour changed. Background noise appeared to mask the communication of crucial information between birds. While aggressive communication is common and birds respond to it, interference through noise can lead to the birds mistaking the signals.  Birds can end up in situations all too familiar to humans. “The birds receive incomplete information on their opponent’s intent and do not appropriately adjust their response,” explained Arnott. “Where song is disguised by background noise, in some cases the male ends up fighting more vigorously than he should, but at other times gives in too easily.”Arnott said the purpose of birdsong was twofold – to attract mates and defend territory. Birds already face an array of human-made dangers, from pesticides and intensive farming to shooting and poisoning. But noise had often been overlooked, the paper in Biology Letters found. A spokesperson for the RSPB said: “Everyone is becoming increasingly concerned that nature is in crisis in the UK, with one in 10 of our wildlife species at threat of extinction. Many of our birds’ populations are already facing a serious crisis as a result of habitat loss, climate change and other human activities. This report is a good reminder that the way we live and our lifestyle has an impact on our natural world, and that we need to protect our natural world if we want to let nature sing.”  For birds, the extra burden of noise pollution adds to extraordinary decline in species, including among once common birds, in recent decades due to such activities as agricultural practice and pesticide use. In the experiment the team used playbacks of robin song to stimulate responses from birds who were territory holders. Simple or complex songs were used in either the presence or absence of noise. The researchers found that song complexity  was used as a signal of aggressive intent; birds demonstrated higher aggressive intent towards complex rather than simple song. This process was disrupted by the presence of added noise.
8. Which of the following can be inferred from the passage?

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Culture has a strong influence on non–verbal communication. Even the simple act of  looking someone in the eye is not at all that simple. In the USA, Americans are (1) ______ to look directly at people when speaking to them. It shows interest in what they are saying and is thought to carry a (2) ______ of honesty. Meanwhile, in Japan and Korea, people avoid long periods of eye contact. It is considered more polite to look to the side during a conversation. The Lebanese, (3) ______, stand close together and look intensely into each other’s eyes. The action shows sincerity and gives people a better sense of what their counterparts want. Given such differences with even the most common expressions, people (4) ______ travel or work abroad have a real need to learn the other culture’s body language. People tend to be unaware of the messages they are sending to others. So, it is (5) ______ to consider your own body language before dealing with people from other cultures. Knowing about the body language of friends, clients, and colleagues can be very helpful in improving understanding and avoiding miscommunication

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Diseases are a natural part of life on earth. If there were no diseases, the population would grow too quickly, and there would not be enough food or other resources, so in a way, diseases are natural ways of keeping the Earth in balance. But sometimes they spread very quickly and kill large numbers of people. For example, in 1918, an outbreak of the flu across the world, killing over 25 million people only in six months. Such terrible outbreaks of a diseases are called pandemics. Pandemics happen when a disease changes in a way that our bodies are not prepared to fiht. In 1918, a new type of fl virus appeared. Our bodies had no way to fiht this new flu virus, and so it spread very quickly and killed large numbers of people. While there have been many different pandemic diseases throughout history, all of them have a new thing in common. First, all pandemic diseases spread from one person to another very easily. Second, while they may kill many people, they generally do not kill people very quickly. A good example of this would be the Marburg virus. The Marburg virus is an extremely infectious disease. In addition, it is deadly. About 70%-80% of all people who get the Marburg virus died from the disease. However, the Marburg virus has not become a pandemics because most people die within three days of getting the disease. This means that the virus does not have enough time to spread a large number of people. The flu virus of 1918, on the other hand, generally took about a week to ten days to kill its victims, so it had more time to spread. While we may never be able to completely stop pandemics, we can make them less common. Doctors carefully monitor new disease that they fear could become pandemics. For example, in 2002, and 2003, doctors carefully watched SARS. Their health warming may have prevented SARS from becoming a pandemic.
3. Based on the information in the passage the term "pandemics" can be explained as 

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OPEC was established at a conference held in Baghdad Sept. 10–14, 1960, and was  formally constituted in January 1961 by five countries: Saudi Arabia, Iran, Iraq, Kuwait, and Venezuela. Members admitted afterward include Qatar (1961), Indonesia and Libya (1962), Abū Ẓabī (1967), Algeria (1969), Nigeria (1971), Ecuador (1973), and Angola (2007). The United Arab Emirates assumed Abū Ẓabī’s membership in the 1970s. Gabon, which had joined in 1975, withdrew in January 1995, but it had relatively insignificant oil reserves. Ecuador suspended its membership from OPEC from December 1992 until October 2007, while Indonesia suspended its membership beginning in January 2009.  OPEC’s headquarters, first located in Geneva, was moved to Vienna in 1965. OPEC members coordinate policies on oil prices, production, and related matters at semiannual and special meetings of the OPEC Conference. The Board of Governors, which is responsible for managing the organization, convening the Conference, and drawing up the annual budget, contains representatives appointed by each member country; its chair is elected to a one-year term by the Conference. OPEC also possesses a Secretariat, headed by a secretary – general appointed by the Conference for a three-year term; the Secretariat includes research and energy-studies divisions.  OPEC members collectively own about two-thirds of the world’s proven petroleum reserves and account for two-fifths of world oil production. Members differ in a variety of ways, including the size of oil reserves, geography, religion, and economic and political interests. Four members – Kuwait, Qatar, Saudi Arabia, and the United Arab Emirates – have very large per capita oil reserves; they also are relatively strong financially and thus have considerable flexibility in adjusting their production. Saudi Arabia, which has the largest reserves and a relatively small (but fast-growing) population, has traditionally played a dominant role in determining overall production and prices Because OPEC has been beset by numerous conflicts throughout its history, some experts have concluded that it is not a cartel – or at least not an effective one – and that it has little, if any, influence over the amount of oil produced or its price. Other experts believe that OPEC is an effective cartel, though it has not been equally effective at all times. The debate largely centers on semantics and the definition of what constitutes a cartel. Those who argue that OPEC is not a cartel emphasize the sovereignty of each member country, the inherent problems of coordinating price and production policies, and the tendency of countries to renege on prior agreements at ministerial meetings. Those who claim that OPEC is a cartel argue that production costs in the Persian Gulf are generally less than 10 percent of the price charged and that prices would decline toward those costs in the absence of coordination by OPEC.  The influence of individual OPEC members on the organization and on the oil market usually depends on their levels of reserves and production. Saudi Arabia, which controls about one-third of OPEC’s total oil reserves, plays a leading role in the organization. Other important members are Iran, Iraq, Kuwait, and the United Arab Emirates, whose combined reserves are significantly greater than those of Saudi Arabia. Kuwait, which has a very small population, has shown a willingness to cut production relative to the size of its reserves, whereas Iran and Iraq, both with large and growing populations, have generally produced at high levels relative to reserves. Revolutions and wars have impaired the ability of some OPEC members to maintain high levels of production. 
7. Which of the following is NOT true about OPEC according to the passage?

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In 1972. a century after the first national park in the United States was established at Yellowstone, legislation was passed to create the National Marine Sanctuaries Program. The intent of this legislation was to provide protection to selected coastal habitats similar to that existing for land areas designated as national parks. The designation of an areas a marine sanctuary indicates that it is a protected area, just as a national park is. People are permitted to visit and observe there, but living organisms and their environments may not be harmed or removed.
The National Marine Sanctuaries Program is administered by the National Oceanic and  Atmospheric Administration, a branch of the United States Department of Commerce. Initially, 70 sites were proposed as candidates for sanctuary status. Two and a half decades later, only fifteen sanctuaries had been designated, with half of these established after 1978. They range in size from the very small (less than 1 square kilometer) Fagatele Bay National Marine Sanctuary in American Samoa to the Monterey Bay National Marine Sanctuary in California, extending over 15,744 square kilometers.
The National Marine Sanctuaries Program is a crucial part of new management practices in which whole communities of species, and not just individual species, are offered some degree of protection from habitat degradation and overexploitation. Only in this way can a reasonable degree of marine species diversity be maintained in a setting that also maintains the natural interrelationships that exist among these species.
Several other types of marine protected areas exist in the United States and other countries. The National Estuarine Research Reserve System managed by the United States government, includes 23 designated and protected estuaries. Outside the United States, marine protected-area programs exist as marine parks, reserves and preserves.
Over 100 designated areas exist around the periphery of the Caribbean Sea. Others range from the well-known Australian Great Barrer Reef Marine Park to lesser-known parks in countries such as Thailand and Indonesia, where tourism is placing growing pressures on fragile coral reef systems. As state, national, and international agencies come to recognize the importance of conserving marine biodiversity, marine projected areas whether as sanctuaries,parks, or estuarine reserves, will play an increasingly important role in preserving that diversity.

What does the passage mainly discuss?

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The government's interference in the strike has been widely criticised

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For many years, scientists have speculated that the cataclysmic impact of an asteroid with the earth was responsible for the demise of the dinosaurs approximately 65 million years ago. Previous discoveries and results have hinted that an asteroid two kilometers in diameter struck the Yucatan peninsula in Eastern Mexico. This impact, stronger than one thousand nuclear explosions, is speculated to have cast a cloud of dust and debris into the atmosphere, covering the entire surface of the earth and blocking out the sun and consequently lowering the surface temperature of the earth. With such a radical change in the earth's environment, scientists believe that over 99% of all animal and plant species were eradicated. Only after millions of years did plants and animals even begin to recover and develop into forms that were better adapted to survive changes in their environment. But, the reign of the dinosaurs had ended and the age of mammals had begun. The crucial link that has held this theory together has been the element iridium. Iridium is not commonly found on either the surface of the earth or inside the crust. It is more commonly found in asteroids or meteorites throughout the solar system. Scientists have hypothesized that after the asteroid impacted the Earth, an even layer of iridium sediment settled over the globe and eventually became part of its surface. The theory, of course, has depended on the discovery of such an existing layer of iridium. Unfortunately, scientists have never been able to offer absolute proof that this asteroid impact ever occurred. Recently, however, a discovery may go a long way toward validating these scientists 'theories. In 1996, a team of marine biologists excavated samples of rock from the Atlantic Ocean just off the cost of Bermuda. Found thousands of meters below the sea, these samples contain iridium similar to those found in the Yucatan peninsula thousands of kilometers away. At first, scientists were skeptical whether the samples were from the same time period. But since carbon dating placed them to 65 million years ago, their doubts were quickly alleviated. Since then many of the other theories for the demise of the dinosaur have been finally laid to rest.
9. According to the passage, the iridium found beneath the ocean floor near Bermuda: 

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There are a number of initiatives, some already introduced and some in the pipeline,  that are specifically designed to ensure that the economic value of nature is recognised. One example is reduced emissions from deforestation and forest degradation, under  which forest owners are paid not to cut down trees. A number of governments across the world have committed hundreds of millions of dollars to these projects. Another is habitat banking, the market for which currently stands at around $3bn in the US, where companies that degrade natural areas are forced to restore nature elsewhere. Trade in forest conservation obligations in Brazil and ground-water salinity credits in Australia have also proved successful. Alongside these schemes and those like them, there are various compensation arrangements that make those causing environmental damage pay for it, just like carbon credits that currently exist. Exemptions from these various taxes, charges and fees, as well as subsidies, are also used to encourage environmentally responsible behaviour.  There is also growing pressure for companies to begin incorporating the costs of the damage that they do to the Earth’s natural resources into their profit and loss accounts. Only by incorporating these costs into their accounts, many argue, will companies be forced to reduce their impact on the natural world. "Directors’ bonuses don’t have to be included in company accounts from a pure profit and loss point of view, but they are. Environmental externalities should be the same," says Pavan Sukhdev, a career banker and team leader of the United Nations’ The Economics of Ecosystems and Biodiversity study.  “This is not a straightforward process and needs standard methodologies accepted by everyone, but it could be achieved within 10 years.” The next step would be to incorporate environmental assets into national accounts. 
5. According to paragraph 3, why do companies have to include green fee in their financial records?

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Scientists have uncovered a new threat to the world’s endangered coral reefs. They  have found that most are incapable of growing quickly enough to compensate for rising sea levels triggered by global warming. The study suggests that reefs – which are already suffering serious degradation because the world’s seas are warming and becoming more acidic – could also become overwhelmed by rising oceans.  The research – led by scientists at Exeter University and published in Nature this week – involved studying growth rates for more than 200 tropical western Atlantic and Indian Ocean reefs. It was found only 9% of these reefs had the ability to keep up with even the most optimistic rates of sea-level rises forecast by the Intergovernmental Panel on Climate Change. “For many reefs across the Caribbean and Indian Ocean regions, where the study focused, rates of growth are slowing due to coral reef degradation,” said Professor Chris Perry, of Exeter University. “Meanwhile, rates of sea-level rise are increasing – and our results suggest reefs will be unable to keep up. As a result, water depths above most reefs will increase rapidly through this century.”  Sea levels rose by several inches over the past century and measurements indicate the speed of this increase is now rising significantly. Two key factors are involved: climate change is making ocean water warmer and so it expands. And as ice sheets and glaciers melt, they increase amounts of water in the oceans.  At the same time, reefs are being weakened by ocean warming and also by ocean acidification, triggered as the seas absorb more and more carbon dioxide. These effects lead to bleaching events that kill off vast stretches of coral and limits their ability to grow.  “Our predictions, even under the best case scenarios, suggest that by 2100, the inundation of reefs will expose coastal communities to significant threats of shoreline change,” said co-author Prof Peter Mumby of Queensland University. This point was backed by US marine scientist Ilsa Kuffner writing in a separate comment piece for Nature. “The implications of the study are dire. Many island nations and territories are set to quickly lose crucial natural resources.” 
6. The word “inundation” is closest in meaning to _____________

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Some U.S. schools, however, have tried to limit or remove technology to improve learning. One of them is in Silicon Valley, the centre of the American tech industry. The Waldorf School of the Peninsula does not use any computers or (1) ____ technology in its education programs up to the seventh grade. The school’s website says while Waldorf teachers recognize the role technology can (2) ____ in the classroom, it must wait until the student reaches the right developmental age. “We observe that a child’s natural, instinctive, creative and curious way of (3) ____ to the world may be repressed when technology is introduced into learning environments at an early age,” the website says. When students reach high school, they are allowed to use computers and digital tools in the classroom. There are many independent Waldorf Schools throughout North America. The schools centre heavily on (4) ____ learning and aim to teach skills in “creativity and innovative thinking.” They also (5) ______ importance on students developing “social and emotional intelligence” as part of the educational experience

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 Right now, the biggest source of energy in the world is fossil fuel. Fossil fuels are oil, gas, and coal. More than 80 percent of the world's energy comes from fossil fuel. There are many problems with fossil fuel. One problem is that when fossil fuel is burned, it pollutes the air. Also, when we take fossil fuel from the Earth, we often cause a lot of damage. Another problem is that we are running out of it. That is why we need new sources of energy. A big source of energy for many countries is nuclear power. Thirty-one countries use nuclear power. Many ships also use it.
 Nuclear power has some advantages. First of all, we can't run out of nuclear power. Nuclear power does not make the air dirty. Also, if a country has nuclear power, it doesn't need to buy as much as oil from other countries.
 However, there are also a lot of problems that come with nuclear power. For example, nuclear accidents are very serious. In 1986, there was a nuclear accident in Ukraine. In the next 20 years, about 4,000 people got sick and died. In 2011, there was another very serious nuclear accident in Japan. Japan is still trying to clean up the nuclear waste from the accident.
 Many people don't want nuclear power in their countries. They say that it is not safe. A lot of people want their countries to use safer and cleaner ways to get electricity. There have been protests against nuclear energy in the United States, Russia, France, Taiwan, Japan, India, and many other countries.
 Although many people hate nuclear energy, more and more countries are using it. One reason for this is that the world is using more and more energy. We just don't have enough fossil fuel. However, if we use nuclear power, then we may have more serious problems in the future.

All of the following are true about nuclear accidents EXCEPT that ______. 

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Who talks more - men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has the studied the communication style of men and women, says that this is a stereotype. According to Tannen, women are more verbal - talk more - in private situations, where they use conversation as the “glue’ to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these difference even in children. Little girls often play with one ‘best friend’ and their play includes a lot of conversation. Little boys often play games in groups, their play usually involves more doing than talking. In school, girls are often better at verbal skills, while boys are often better at mathematics.
A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children aged 3-6 and their parents. They found evidence that parents talk very differently to their sons than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters, they use more descriptive language and more details. There is also far more talk about emotions, especially with daughters than with sons.

Which word is similar in meaning to the word “glue” ?

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A good memory is often seen as something that comes naturally, and a bad memory as something that cannot be changed, but actually (1)______ is a lot that you can do to improve your memory. We all remember the things we are interested in and forget the ones that bore us. This no doubt explains the reason (2)______ schoolboys remember football results effortlessly but struggle with dates from their history lessons! Take an active interest in what you want to remember, and focus on it (3)______. One way to ‘make’ yourself more interested is to ask questions — the more the better! Physical exercise is also important for your memory, because it increases your heart (4)______ and sends more oxygen to your brain, and that makes your memory work better. Exercise also reduces stress, which is very bad for the memory. The old saying that “eating fish makes you brainy” may be true after all. Scientists have discovered that the fats (5)______ in fish like tuna, sardines and salmon — as well as in olive oil — help to improve the memory. Vitamin-rich fruits such as oranges, strawberries and red grapes are all good brain food‘, too.

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The biological community changes again as one moves from the city to the suburbs. Around all cities is a biome called the "suburban forest". The trees of this forest are species that are favored by man, and most of them have been deliberately planted. Mammals such as rabbits, skunks, and opossums have moved in from the surrounding countryside. Raccoons have become experts at opening garbage cans, and in some places even deer wander suburban thoroughfares. Several species of squirrel get along nicely in suburbia, but usually only one species is predominant in any given suburb -fox squirrels in one place, red squirrels in another, gray squirrels in a third - for reasons that are little understood. The diversity of birds in the suburbs is great, and in the South, lizards thrive in gardens and even houses. Of course, insects are always present. There is an odd biological sameness in these suburban communities. True, the palms of Los Angeles are missing from the suburbs of Boston, and there are species of insects in Miami not found in Seattle. But over wide stretches of the United States, ecological conditions in suburban biomes vary much less than do those of natural biome. And unlike the natural biomes, the urban and suburban communities exist in spite of, not because of, the climate.

If there was a preceding paragraph to this passage it would most likely be concerned with which of the following topics?