In the mid - nineteenth century, the United States had tremendous natural resources that could be exploited in order to develop heavy industry. Most of the raw materials that are valuable in the manufacture of machinery, transportation facilities, and consumer goods lay ready to be worked into wealth. Iron, coal, and oil - the basic ingredients of industrial growth - were plentiful and needed only the application of technical expertise, organizational skill, and labor.

One crucial development in this movement toward industrialization was the growth of the railroads. The railway network expanded rapidly until the railroad map of the United States looked like a spider's web, with the steel filaments connecting all important sources of raw materials, their places of manufacture, and their centers of distribution. The railroads contributed to the industrial growth not only by connecting these major centers, but also by themselves consuming enormous amounts of fuel, iron, and coal.

Many factors influenced emerging modes of production. For example, machine tools, the tools used to make goods, were steadily improved in the latter part of the nineteenth century - always with an eye to speedier production and lower unit costs. The products of the factories were rapidly absorbed by the growing cities that sheltered the workers and the distributors. The increased urban population was nourished by the increased farm production that, in turn, was made more productive by the use of the new farm machinery. American agricultural production kept up with the urban demand and still had surpluses for sale to the industrial centers of Europe.

The labor that ran the factories and built the railways was recruited in part from American farm areas where people were being displaced by farm machinery, in part from Asia, and in part from Europe. Europe now began to send tides of immigrants from eastern and southern Europe - most of whom were originally poor farmers but who settled in American industrial cities. The money to finance this tremendous expansion of the American economy still came from European financiers for the most part, but the American were approaching the day when their expansion could be financed in their own " money market".

Which of the following in NOT true of United States farmers in the nineteenth century?

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An individual’s personality is the complex of mental characteristics that makes them unique from other people. It includes all of the patterns of thought and emotions that cause us to do and say things in particular ways. At a basic level, personality is expressed through our temperament or emotional tone. However, personality also colors our values, beliefs, and expectations. There are many potential factors that are involved in shaping a personality. These factors are usually seen as coming from heredity and the environment. Research by psychologists over the last several decades has increasingly pointed to hereditary factors being more important, especially for basic personality traits such as emotional tone. However, the acquisition of values, beliefs, and expectations seem to be due more to socialization and unique experiences, especially during childhood. Some hereditary factors that contribute to personality development do so as a result of interactions with the particular social environment in which people live. For instance, your genetically inherited physical and mental capabilities have an impact on how others see you and, subsequently, how you see yourself. Likewise, your health and physical appearance are likely to be very important in your personality development. You may be frail or robust. You may have a learning disability. You may be slender in a culture that considers obesity attractive or vice versa. These largely hereditary factors are likely to cause you to feel that you are nice-looking, ugly, or just adequate. Likewise, skin color, gender, and sexual orientation are likely to have a major impact on how you perceive yourself. Whether you are accepted by others as being normal or abnormal can lead you to think and act in a socially acceptable or marginal and even deviant way. There are many potential environmental influences that help to shape personality. Child rearing practices are especially critical. In the dominant culture of North America, children are usually raised in ways that encourage them to become self-reliant and independent. Children are often allowed to act somewhat like equals to their parents. Children are given allowances and small jobs around the house to teach them how to be responsible for themselves. In contrast, children in China are usually encouraged to think and act as a member of their family and to suppress their own wishes when they are in conflict with the needs of the family. Independence and self-reliance are viewed as an indication of family failure and are discouraged.
8. According to the passage, what is valued in one society may _____ 

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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.
10. The author mentions SARS in order to:

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Most of the roughly 1,400 active volcanoes around the world, including many in the  United States, do not have on-site observatories. Lacking ground-level data, scientists are turning to satellites to keep tabs on volcanoes from space. Now using artificial intelligence, scientists have created a new satellite-based method of detecting warning signs of when a volcano is likely to erupt.  Every time one of the satellites passes over a given volcano, it can capture an InSAR image of the volcano from which ground movement away from or toward the satellite can be calculated.  InSAR can often pick up the ominous expansion of the ground that occurs when magma moves within a volcano’s plumbing, but it is difficult to continuously monitor the huge number of images produced by the latest generation of SAR-equipped satellites. In addition, some volcanoes exhibit long-lasting deformation that poses no immediate threat, and new images must be compared with older ones to determine whether a deformation at a volcano is a warning sign or just business as usual. To solve these issues, the researchers turned to machine learning, a form of artificial intelligence that can glean subtle patterns in vast quantities of data. They developed an algorithm that can rapidly analyze InSAR data, compare current deformation to past activity, and automatically create an alert when a volcano’s unrest may be cause for concern.  To test the algorithm’s viability, the team applied it to real data from the period leading up to the 2018 eruption of Sierra Negra, a volcano in the Galápagos Islands. The algorithm worked, flagging an increase in the ground’s inflation that began about a year before the eruption. Had the method been available at the time, the team writes, it would have accurately alerted researchers that Sierra Negra was likely to erupt.
2. What does the phrase “keep tabs on” in paragraph 1 mean?

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An important point to remember if you like spending time out in the open air is that the human head doesn’t work very well outdoors if it becomes too hot, cold or wet. That’s why a hat is a good investment, whenever you are planning to go out and about. Surprisingly, a single waterproof hat with a brim will do the (34)______ adequately in most conditions. In cold climates, the problem is that the head is (35)______ heat all the time. As much as fifty to sixty per cent of your body’s heat is lost through the head and neck, (36)______ on which scientist you believe. Clearly this heat loss needs to be prevented, but it’s important to remember that hats don’t actually keep you warm, they simply stop heat escaping. Just as important is the need to protect your neck from the effects of bright sunlight, and the brim of your hat will do this. If you prefer a baseball cap, (37)______ buying one that has a drop down ‘tail’ at the back to stop your neck getting sunburnt. And in wet weather (38)______, hats are often more practical than pooling up the hood of your waterproof coat because when you turn your head, the hat goes with you, whereas the hood usually does not.

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Though overwhelmed by the news of the novel coronavirus outbreak, Munyaradzi Gurure, the 21-year-old student at Guangxi University of Finance and Economics from South Africa, has still stepped out to serve as a volunteer in the train station to help battle the epidemic.  “I’m well aware the situation of epidemic prevention and control is very severe,” he said. “Seeing that many people actively joined in the fight, I also wanted to do my part and volunteer at the station.” With the number of novel coronavirus cases continuing to rise both in and outside of China, Gurure’s family back in South Africa was very worried about his health, and hoped he would quit the volunteer job. “I told my parents China has taken a lot of strong quarantine measures and is actually safe,” he said. “I want to do whatever I can to prevent the spread of the infection. The country took really good care of me during the last three years.”  Working about four hours a day, Gurure either carries an 8-kilogram electric sprayer to disinfect the waiting room or checks passengers’ temperature as soon as they walk into the station. He also makes sure people are in good health and wearing masks at all times. Though it’s not easy work, Gurure came across many Chinese who are very surprised to see a foreign face, but then give a thumbs up and say “very good” to him in Chinese. Gurure’s foreign classmates found out about his volunteer job and sent messages saying “good job”, some showing interest in joining him to help curb the spread of the virus. 
There are many ways in which you can help people with disabilities; however, be  aware that there are also ways you can hinder rather than help them. Please read through these tips before you try helping someone with a disability. Here are some general rules for helping all people with disabilities.  Always treat people with disabilities as equals. All people want to have friends, fun, and experience life to the maximum. People with disabilities are no exception. Never be afraid, skeptical, or embarrassed to approach someone with a disability. People with disabilities have just as much fun!  Always ask before you help. People with disabilities have varying levels of independence. Never assume someone with a disability has a low-level. If someone looks like they’re struggling, ask before you help. A person may welcome help, or they may ask that you let her be independent; but even if she looks like she’s struggling, she may just want to become more independent, which requires practice in everyday situations.  Never assume someone does or does not have a disability. Everyone is different. Sometime, people with disabilities may act, feel, or think differently than you. Don’t assume that for this reason someone has a disability, simply treat him/her as an individual because all people should be treated equally.  Do not stare. Sometimes it is an eye-opening experience to see someone with a disability in public. However, people with disabilities have lives just like everyone else. You are certainly allowed to look, but do not stare at a person with a disability. Simply view them the way you view others.  Respect and understand confidentiality. People with disabilities have a right to privacy. They are not obligated to tell you about their disability. If someone does tell you about his/her disability, do not assume that he/she is comfortable with you telling other people about his/her disability. Always ask permission to discuss the disability before you do it. 
1. What is it like to make friends with disabled people? 

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

A smile can be observed, described, and reliably indentify; it can also be elicited and manipulated under experimental conditions

Read the passage carefully and choose the correct 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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Some cities are located by chance. A wagon breaks down, the driver spends some  time in repairs, finds that he is in a congenial spot, and settles down. Later another person builds a house near his, and later someone adds an inn. Someone else starts selling farm produce there. Soon there is a little market, which grows to a town, and later to a city.  Other places were destined by nature to become cities. London, for example, is on what is called the head of navigation - the point where it becomes too difficult for oceangoing ships to continue upriver, and must transfer their cargoes. As with London, the head of navigation is also the point where the river can be conveniently bridged. In fact, the location of a bridge is often the reason for the birth of a town - as Cambridge or Weybridge in England show. Again, a good harbour will generally lead to a city growing up about it. New York and San Francisco began life as ports, as did Cape Town in South Africa. Some places were created mainly for military purposes, such as Milan, and the host of English cities finishing with - cester, which is derived from castra which means camp in Latin. Chester itself, created to guard the Welsh border, is a very good example. Other such military bases are Manchester, Doncaster, and of course, Newcastle.  A few cites are not created by accident, but by intention. This was the case with Milton Keynes in England, but the most famous examples of such cities are capitals. Brasilia, Canberra and Washington are capitals created in modern times, but even their greatest admirers will admit that they lack a certain character. It is no co-incidence that there are famous pop songs about New York, (“New York, New York”) Chicago (“My kind of Town”) San Francisco (“Going to San Francisco”) and many other US cities, but none about the nation’s capital. On the other hand any Londoner can give you at least three songs about the place.
3.  According to the passage, London owes its origin 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:
Modern civilization is heavily dependent on energy. Without reliable power sources, e coulnt operate machines, use transportation, communicate via Internet, or do many other things. Although everyone recognizes the importance of energy, deciding what kind of energy the world should use in the future is not a simple task. The two leading candidates for this role are green energy and nuclear energy.
Currently, most of the energy we use is derived from fossil fuels. Although this energy source has got us this far, there are several problems with it. For starters, it is a finite resource which is quickly running out. Some analysts have even estimated that the Earth could run out of coal and oil within the next 50 years. Burning fossil fuels also creates large amount of pollution, which is harmful to the environment. Although fossil fuels still provide the majority of our power, governments are seeking better energy sources to use going forward.
Green energy is one option that is becoming increasingly attractive. It includes technologies such as solar, wind, and hydro power. These are seen as clean sources of energy because they cause very little pollution. In addition, they are completely renewable, so there is no danger that it will run out. The major disadvantage with green energy sources is that they are not cheap.
The other alternative is nuclear power. Like green energy, it is also a renewable source of power that will not run out, and it also doesn’t produce air pollution. In addition, nuclear power is more reliable than green energy, as it doesn’t depend on sunshine, rain, or wind to operate. The major issues with nuclear power are safety concerns and nuclear waste. Nuclear power plants create a considerable amount of nuclear waste which is extremely hazardous to people’s health. I they happen to have a meltdown, this could destroy the surrounding area for years to come.
The recent nuclear disaster in Fukushima, Japan brought this reality into the spotlight once again. In response, Germany announced it would close down eight of its nuclear plants immediately, and close the rest by 2022. Meanwhile, other nations refuse to give up on nuclear power, stating that these disasters are rare. The debate of whether to use green or nuclear power will likely continue for some time. In the end, it is quite possible that both energy sources will be used to fuel our planet.

What does the author think is the most likely energy solution for the future?

Choose the best answer:
Since changing the way of production, many craftsmen have voluntarily joined together to form ……….

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.

   The White House, the official home of the United States president, was not built in time for George Washington to live in it. It was begun in 1792 and was ready for its first inhabitants. President and Mrs.John Adams, who moved in on November 1, 1800. When the Adamses moved in, the White House was not yet complete, and the Adamses suffered many inconveniences; for example, the main staircase was incomplete, which hindered movement from floor to floor, and the future laundry yard was merely a pool of mud, so wet laundry was hung in the unfinished East Room to dry. Thomas Jefferson, the third president, improved the comfort of the White House in many respects and added new architectural features such as the terraces on the east and west ends.

   When the British forces burned the White House on August 24, 1814, President Madison was forced to leave.All the remained after the fire was the exterior walls, the interior was completely destroyed. It was not until December of 1817 that the following president, James Monroe, was able to move into a rebuilt residence. Since then, the White House has continued to be modified but has been continuously occupied by each succeeding U.S president.

The word “forces” in line 9 could best be replaced by:

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College is usually the first time young people are on their own without parents’ guidance or rules. Students learn to participate (1) _____ a responsible member of various groups within the college environment: fellow students, roommates, teachers, college staff, sports teammates, religious groups, study groups, romantic partners or extracurricular clubs. You’ll also learn how to grow your sense of (2)_____ identity. “Socialization is a process of learning what it means to be a member of a group and navigating one’s sense of self as (3) _____ of that process. Because there are many different groups on a college (4)_____ socialization might include finding like-minded peers on campus to differentiate one’s self from others and (5) _____ closer bonds with some group members (as in fraternities and sororities),” explained Karen Sternheimer, Associate Professor of Sociology at the University of Southern California

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We find that bright children are rarely held back by mixed- ability teaching. On the contrary, both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all, it can be quite discouraging to be at the bottom of the top grade! Besides, it is rather unreal to grade people just according to their intellectual ability. This is only one aspect of their total personality. We are concerned to develop the abilities of all our pupils to the full, not just their academic ability. We also value personal qualities and social skills, and we find that mixed- ability teaching contributes to all these aspects of learning. In our classrooms, we work in various ways. The pupils often work in groups; this gives them the opportunity to learn to co-operate, to share, and to develop leadership skills. They also learn how to cope with personal problems as well as learning how to think, to make decisions, to analyze and evaluate, and to communicate effectively. The pupils learn from each other as well as from the teachers. Sometimes the pupils work in pairs; sometimes they work on individual tasks and assignments; and they can do this at their own speed. They also have some formal class teaching when this is appropriate. We encourage our pupils to use the library, and we teach them the skills they need in order to do this effectively. An advanced pupil can do advanced work; it does not matter what age the child is. We expect our pupils to do their best, not their least, and we give them every encouragement to attain this goal.
3. The author argues that a teacher's chief concern should be the development of the pupils'.........

Choose the best answer:
She is a studious child because she never forget to do homework

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The year was 1810, the place was southern Germany, Bavaria, and life was hard. It was the month of October and all of the countryside had been working day and night to finish their fall harvest and prepare for the onset of winter. While the plow horses were working and the farmers’ days were filled from sun up to sun down, there were some other preparations being made as well. Prince Ludwig I and his entire court were preparing for his upcoming marriage to Princess Therese of Sachsen-Hildurghausen. The grand wedding was to take place on the 12th, right in the middle of the harvest. As you know any wedding can be difficult to plan, but when you’re a prince it can be even more stressful. The invitations had gone out, the garments had been made and the location had been selected. The big event was to be held in a magnificent “Weise” (meadow) just outside the gates of Munich. As the big day approached, the countryside and town, in fact all of Bavaria was a buzz with talk of the big day. Everyone was planning on attending as they were all exhausted from the harvest and it was really the last chance before the long, cold days of winter to get out and blow off some steam. On the 12th, the ceremony went off without a hitch. The weather was perfect, the bride looked beautiful and about 40,000 guests were in attendance. The reception, as you can imagine, was one of the biggest parties history had ever seen with copious amounts of beer and massive quantities of food being devoured. It was a reception fit for a prince. And this prince was absolutely ecstatic. Ludwig I was so taken with all of his guests that he planned a special treat for them. The prince knew that all of his subjects were huge fans of horseracing so he planned to conclude the event with a somewhat impromptu horse race across the great meadow. When the townspeople heard of this they erupted in a jubilant cry Zicke Zacka, Zicke Zacka, Hoy, Hoy, Hoy. This is still chanted in the beer tents of today’s Oktoberfest celebrations. It was then and there that they decided unanimously to rename the wiese Theresiewiese (Therese Meadow) in honor of the Prince’s new bride. This was their humble way of welcoming her to town. To this day that very meadow still bears her name. After a spectacular day and night — and probably more than a couple of hangovers — the great event came to an end. It was the following fall as the townspeople began to reminisce about the great time they had had the previous year (as do many of our Oktoberfest guests tend to do around the fall) that they decided to honor their prince and celebrate his wedding anniversary in much the same way. King Maximillian agreed, but this party was to be even bigger, better and longer than the first. The event became an annual celebration. And that my friends is how the Oktoberfest tradition began and continues today. As a side note, the beer that was poured all those years ago and that has been continually served at every Oktoberfest in Munich since will now be served at the Big Bear Lake Oktoberfest. The very same beer flowing from the taps in Munich, Germany will be the beer flowing from our taps in humble Big Bear Lake. And like the beer, our Burgermeister just happens to be a true German original as well. 
7. What is implied in paragraph 5?

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Many of us experience multiple queues on an average day. If the move quickly,  they’re soon forgotten. But a slow line can be extremely annoying. What separated a good queuing experience from a bad one, however, is not just the speed of the line. In fact, how the wait makes us feel can have a greater impact on our perception of a queues than how much time we spend in it.  To understand how, consider the story of an airport getting complaints for the long waits at the baggage carousel. After trying fruitlessly to make baggage delivery faster, the airport simple moved the arrival gates outside of the main terminal, making people walk six times longer. Time was spent walking instead of waiting around and complaints dropped to almost zero as a result. A similar example can be observed during the postwar boom in high rise buildings in many elevator halls, where mirrors are installed to give people a chance to adjust their clothes and make sure that they look great, which distracts them from the long wait for their elevator.
For many people, the golden standard of line design and management can be found in theme parks, where waiting lines are such as integral part that companies are not afraid to invest. Some of the tricks theme parks use to make waits more bearable are hiding the line behind corners or walls to make it appear shorter and inflating the waiting times announced at each attraction. If the sign says the wait is an hour, often it will actually be more like 45 minutes, which will make people feel like they’re 15 minutes ahead of schedule. At Disneyland, designers and engineers also add games and other activities in order to give guests plenty to do, which keeps them from measuring the passage of time. According to Larson, Disney lines are so entertaining that on rainy days, when attendance is low, rides in the parks may fill up too slowly because families linger in the queue for too long.  Clever line design can also be found in supermarkets. Multiple parallel lines, each in front of a checkout, can be great if you’re in a fast one, but can feel very unfair if you’re stuck in a slow one. That’s why businesses are increasingly switching to the serpentine line, in which all customers are funneled into a single queue and then sent to the first available checkout. Compared to parallel lines, the serpentine triumphs in the key department of fairness: it’s strictly first come, first served, so no one arriving after you can be served before you
3. What can be inferred from the passage?

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The walnut tree produces wood that is used for countless purposes, and is considered the finest wood in the world. The wood is easy to work with, yet it is very hard and durable - and when it is polished, it produces a rich, dark luster. It also shrinks and swells less than any other wood, which makes it especially desirable for fine furniture, flooring, and even gun stocks. In fact, just about every part of the walnut is unusually hard and strong. The nut of the tree is encased inside a very hard shell, which itself is enclosed in a leathery outer covering called a husk. It requires real effort to break through those layers to get at the tasty meat inside. Yet every part of the walnut is useful to people. The outer husk produces a dark reddish stain that is hard to remove from the hands of the person who opens the nut, and this pigment is widely used in dyes and wood stains. The inner shell is used as an abrasive to clean jet engines. And the meat of the nut is extensively used in cooking, ice cream, flavourings - and just eaten raw. Walnut trees exude a chemical into the soil near their roots which can be poisonous to some trees and shrubs. Fruit trees, for example, will not survive if planted too close to a walnut. Many other plants, such as maple trees or ivy, are not affected by the walnut’s presence, and are well-suited to grow in its vicinity
2. The walnut tree is believed to produce ____

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The World Health Organization on Wednesday declared the rapidly spreading  coronavirus outbreak a pandemic. Director-General Tedros Adhanom Ghebreyesus said that “We expect to see the number of cases, the number of deaths, and the number of affected countries climb even higher.”  WHO officials had said earlier they were hesitant to call the outbreak a pandemic in case it led governments and individuals to give up the fight. On Wednesday, they stressed that fundamental public health interventions can still limit the spread of the virus and drive down cases even where it was transmitting widely, as the work of authorities and communities in China, Singapore, and South Korea has shown.  The virus, which probably originated in bats but passed to people via an as yet unrecognized intermediary animal species, is believed to have started infecting people in Wuhan, China, in late November or early December. Since then the virus has raced around the globe. South Korea, which has reported nearly 8,000 cases, also appears poised to bring its outbreak under control with aggressive measures and widespread testing. But other countries have struggled to follow the leads of China and South Korea — a reality that has frustrated WHO officials who have exhorted the world to do everything possible to end transmission of the virus. Tedros used the fact that 90% of the cumulative cases have been reported in just four countries as evidence that the rest of the world still had time to prevent an explosion of cases with action.  WHO officials also stressed that countries should be implementing a strategic combination two types of measures. One involves trying to detect and stop known chains of transmission by isolating cases and following and potentially quarantining their contacts. The other involves community-level steps like social distancing and comes into play when the virus is spreading more broadly and transmission chains can’t be tracked. Mike Ryan, the head of the WHO’s emergency program, said that the public health interventions might not have straightforward effect, but to slow the spread of the virus. People with severe cases can require long periods of critical care and strain the resources of hospitals. He said he was worried about “the case load, the demand on the health workers, the dangers that come with fatigue, and potentially shortages of personal protective equipment.”
6. According to paragraph 4, what is the objective of the measures mapped out by the WHO?

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Deforestation is the clearing, destroying, or otherwise removal of trees through  deliberate, natural or accidental means. It can occur in any area densely populated by trees and other plant life, but the majority of it is currently happening in the Amazon rainforest. The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people.  Deforestation occurs for a number of reasons, including: farming, mostly cattle due to its quick turn around; and logging for materials and development. It has been happening for thousands of years, arguably since man began converting from hunter/gatherer to agricultural based societies, and required larger, unobstructed tracks of land to accommodate cattle, crops, and housing. It was only after the onset of the modern era that it became an epidemic.  One of the most dangerous and unsettling effects of deforestation is the loss of animal and plant species due to their loss of habitat; not only do we lose those known to us, but also those unknown, potentially an even greater loss. Seventy percent of Earth’s land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes. The trees of the rainforest that provide shelter for some species also provide the canopy that regulates the temperature, a necessity for many others. Its removal through deforestation would allow a more drastic temperature variation from day to night, much like a desert, which could prove fatal for current inhabitants. In addition to the loss of habitat, the lack of trees also allows a greater amount of greenhouse gases to be released into the atmosphere. Presently, the tropical rainforests of South America are responsible for 20% of Earth’s oxygen and they are disappearing at a rate of 4 hectares a decade. If these rates are not stopped and reversed, the consequences will become even more severe.  The trees also help control the level of water in the atmosphere by helping to regulate the water cycle. With fewer trees left, due to deforestation, there is less water in the air to be returned to the soil. In turn, this causes dryer soil and the inability to grow crops, an ironic twist when considered against the fact that 80% of deforestation comes from small-scale agriculture and cattle ranching.  Further effects of deforestation include soil erosion and coastal flooding. In addition to their previously mentioned roles, trees also function to retain water and topsoil, which provides the rich nutrients to sustain additional forest life. Without them, the soil erodes and washes away, causing farmers to move on and perpetuate the cycle. The barren land which is left behind in the wake of these unsustainable agricultural practices is then more susceptible to flooding, specifically in coastal regions. Coastal vegetation lessens the impact of waves and winds associated with a storm surge. Without this vegetation, coastal villages are susceptible to damaging floods.
4. What does the word “others” in the third paragraph refer?

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.

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