Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. 
     The string family is the largest section of the orchestra. The four main stringed instruments look similar but are all different sizes. Each can be played by plucking the strings with the fingers or with a bow, which is pulled (1) _______ across the instrument's four strings.
      The VIOLIN is the smallest of the string instruments and can play the highest (2) ________. The violin often plays the melody - this is the tune you will be humming after you leave a performance. The VIOLA is slightly larger than the violin. Because it is bigger, it can play lower notes. (3) _______ the viola is only a little bit bigger than the violin, it can be hard to tell them apart. The viola plays many beautiful melodies just like the violin.
      The CELLO is (4) ________ the violin and the viola. It is so large that the cellist must sit on a chair holding the cello between his or her knees in order to play. The cello often plays accompaniment parts.
      Because it is the largest of the stringed instruments, the DOUBLE BASS plays the lowest notes. This instrument is so large that the bass players have to stand up or sit on tall stools to play it. The bass often plays (5) ________ parts with the cello. 

(4)......................

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From time immemorial, cities have been the central gathering places of human life, from where the great ideas and movements of the world have sprouted. In this country, the beginnings of our independence fomented with the Boston Tea Party, while Philadelphia served as the home of the Constitutional Convention. The seeds of economic and financial power were sowed on the streets of New York City. Around the world, the great thinkers of the Renaissance assembled in Florence, the impressionist painters flocked to Paris, and the industrial revolution sparked in Birmingham England.
Hundreds of years later, great ideas and innovations are still sprouting in cities – but this time accompanied by a growth in urbanized life over the last several decades never before seen. For the first time in history, more people are living in cities than rural areas. And, this way of living is only going to continue: by 2050, the urban share of global population is projected to surpass 66 percent (up from 30 percent in 1950). This trend to urbanization is even more dramatic beyond the borders of the United States. Take Nigeria's capital, Lagos, which had a population of approximately 7.2 million in 2000, and is expected to rise to 24 million by 2030. And, eight times more Nigerians live in cities today than in 1975. Moreover, the metro areas of Tokyo, New York and Mexico City were the only metro areas in 1975 with at least 10 million people. Today, that list would include 31 such megacities – with 10 more to join by 2030 – all of which are outside the United States.
Cities are undergoing what Brookings Institution author Bruce Katz terms the "metropolitan revolution." Financial capitals New York and London are transforming into major world tech hubs as new and innovative companies emerge within these cities. And, this shift is not exclusive to New York or London, as many cities are undergoing similar transformations driven by this global trend toward urbanization. This wave of urban growth stems, in large part, from the mass adoption of the internet and interconnected technologies. Interestingly, many sociologists predicted years ago that the advent of such interconnectivity would enable people to live and work anywhere. But the practical result has been the opposite.
Indeed, in this new 21st century economy, innovative workers seek one another to collaborate in building and developing new knowledge-based industries that are increasingly disrupting and dominating a rapidly evolving global economy. Bright, curious minds in the sciences and technology demand proximity in order to be more productive, more creative and further stimulated. This need for collaboration has propelled millennials to move to urban areas in droves. But once they get there, they desire new open physical environments – such as incubators and shared work places – to enhance their collaborative efforts. Beyond work, a growing single population – one that now outnumbers married people in the United States – seeks out other singles amid the myriad activities and diverse nightlife that only cities offer.

The following are the changes in the new 21st century economy, EXCEPT ______________.

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Robots are useful for exploring and working in space. In particular, many robots have been sent to explore Mars. Such robots have usually looked like a box with wheels. Though these robots are useful, by their very nature they are unreliable, extremely expensive, and they break easily. Also, they cannot do very many tasks. Because of these problems, scientists have been developing a new and unusual kind of robot. These new robots move like snakes, so they have been given the name "snakebots."
The way a snake is shaped lets it get into very small spaces, like cracks in rocks. It can also push its way below the ground or climb up different kinds of objects, like high rocks and trees. Such abilities account for the usefulness of a robot designed like a snake. A snakebot would be able to do these things, too, making it much more effective than regular robots with wheels, which easily get stuck or fall over. Since they can carry tools, snakebots would be able to work in space, as well. They could, for example, help repair the International Space Station.
But how can such a robot shape be made? A snakebot is built like a Chain made of about thirty parts, or modules. Each module is basically the same in that they all have a small computer and a wheel to aid movement. The large computer in the "head” of the snake makes all of the modules in a snakebot work together.
The modular design of the snakebot has many advantages. If one module fails, another can be added easily. Snakebot modules can also carry different kinds of tools, as well as cameras. Since each module is actually a robot in itself, one module can work apart from the rest if necessary. That is, all the modules can separate and move on their own, and then later, reconnect back into a larger robot.
Researchers are also trying to develop snakebots made of a special kind of plastic that can change its shape using electricity, almost like animal muscles. Snakebots made with this plastic will be very strong and hard to break.
Overall, the snakebot design is much simpler than that of common robots. Thus, snakebots will be much less expensive to build. For example, a robot recently sent to Mars cost over a hundred million dollars, whereas snakebots can cost as little as a few hundred dollars. With their versatility and affordability, snakebots seem to be the wave of the future, at least as far as space robots are concerned.

According to the passage, which of the following is TRUE about the snakebots?

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage:

"What does a personal trainer do? I meet each Client to discuss what he or she is looking for. It could be anything from improving general fitness to losing, or in a few cases, (1)……  weight. I then devise a training programme for them which I think will help them to achieve their (2)….. . If they have had anything (3)… with them, say a back injury, I speak to a doctor who will (4)…. me what not to do. If someone eats and drinks too much, it’s easy to suggest they (5)…. , but if that doesn’t (6)....... , I look at their diet. I prefer to train on a one-to-one basis, though I do sometimes work with (7)…. if they are friends and want to train together. Who needs a personal trainer? I think most people do. A trainer will push you to try (8)….. . You achieve 20 percent more than you could train alone, no (9)…… how dedicated you are. I’ve got a lot of Americans on my books, and I actually prefer them. (10)….. most Britons, who still haven’t really got the idea, Americans know how to work out."

6. but if that doesn’t (6)....... , I look at their diet.

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Human memory, formerly believed to be rather inefficient, is really more sophisticated than that of a computer. Researchers approaching the problem from a variety of points of view have all concluded that there is a great deal more stored in our minds than has been generally supposed. Dr. Wilder Penfield, a Canadian neurosurgeon, proved that by stimulating their brains electrically, he could elicit the total recall of specific events in his subjects’ lives. Even dreams and other minor events supposedly forgotten for many years suddenly emerged in detail.
The memory trace is the term for whatever is the internal representation of the specific information about the event stored in the memory. Assumed to have been made by structural changes in the brain, the memory trace is not subject to direct observation but is rather a theoretical construct that we use to speculate about how information presented at a particular time can cause performance at a later time. Most theories include the strength of the memory trace as a variable in the degree of learning, retention, and retrieval possible for a memory. One theory is that the fantastic capacity for storage in the brain is the result of an almost unlimited combination of interconnections between brain cells, stimulated by patterns of activity. Repeated references to the same information support recall. Or, to say that another way, improved performance is the result of strengthening the chemical bonds in the memory.

The word “that” refers to............................

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Since the world became industrialized, the number of animal species that have either become extinct or near extinction has increased. Bengal tigers, for instance, which once roamed the jungles in vast numbers, now number only about 2,300. By the year 2025, it is estimated that they will become extinct.
What is alarming about the case of the Bengal tiger is that this extinction will have been caused almost entirely by poachers who, according to some sources, are not always interested in material gain but in personal gratification. This is an example of the callousness that is contributing to the problem of extinction. Animals such as the Bengal tiger, as well as other endangered species, are valuable parts of the world/s ecosystem. International laws protecting animals must be enacted to ensure their survival-and the survival of our planet.
Countries around the world have begun to deal with the problem in various ways. Some countries, in an effort to circumvent the problem, have allocated large amounts of land to animal reserves. They then charge admission prices to help defray the costs of maintaining the parks, and they often must also depend on world organizations for support. This money enables them to invest in equipment and patrols o protect the animals. Another response to the increase in animal extinction is an international boycott of products made from endangered species. This has had some effect, but by itself will not prevent animals from being hunted and killed.a

What does the word 'this' in paragraph 2 refer to in the passage?

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Good press photographer must have an ‘eye’ for news, just as journalists must have a nose for a good story. They must be able to interpret a story and decide rapidly how they can take advantage (1)......the best opportunities to take picture. The most difficult part of a press photographer’s job is that he or  she  has  to  be  able to (2)....... a complicated situation with just one photograph. They rarely have second chances and must be able to take the required shot very quickly. Indeed, speed is essential- if the photographs are not ready for the printing deadline, they are very unlikely to be of any use.
Most press photographers begin work with a local newspaper. There, the demand is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (3).....the enthusiasm to put ‘something special’ into every picture.
There is (4)........competition  among those (5)......... want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work under greater pressure and take more responsibility. Only highly reliable, talented and resourceful photographers make this difficult move. The work is tough and can be dangerous. On an overseas assignment, photographers may have to cope with unfamiliar food and accommodation, physical and mental stress, and extreme difficulty in transporting the pictures from an isolated area to get to the newspaper on time. They also have to beat the competition from other publications.
(3)........................

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What we today call American folk art was, indeed, art of, by, and for ordinary, everyday “folks” who, with increasing prosperity and leisure, created a market for art of all kinds, and especially for portraits. Citizens of prosperous, essentially middle-class republics — whether ancient Romans, seventeenth-century Dutch burghers, or nineteenth-century Americans — have always shown a marked taste for portraiture. Starting in the late eighteenth century, the United States contained increasing numbers of such people, and of the artists who could meet their demands. The earliest American folk art portraits come, not surprisingly, from New England — especially Connecticut and Massachusetts — for this was a wealthy and populous region and the center of a strong craft tradition. Within a few decades after the signing of the Declaration of Independence in 1776, the population was pushing westward, and portrait painters could be found at work in western New York, Ohio,
Kentucky, Illinois, and Missouri. Midway through its first century as a nation, the United States' population had increased roughly five times, and eleven new states had been added to the original thirteen. During these years the demand for portraits grew and grew eventually to be satisfied by the camera. In 1839 the daguerreotype was introduced to America, ushering in the age of photography, and within a generation the new invention put an end to the popularity of painted portraits. Once again an original portrait became a luxury, commissioned by the wealthy and executed by the professional.
But in the heyday of portrait painting — from the late eighteenth century until the
1850's — anyone with a modicum of artistic ability could become a limner, as such a portraitist was called. Local craftspeople — sign, coach, and house painters — began to paint portraits as a profitable sideline; sometimes a talented man or woman who began by sketching family members gained a local reputation and was besieged with requests for portraits; artists found it worth their while to pack their paints, canvases, and brushes and to travel the countryside, often combining house decorating with portrait painting.

In lines 4-5 the author mentions seventeenth-century Dutch burghers as an example of a group that

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Quite apart from the economic similarity between present-day automation and the mechanization,  (1)..... has been proceeding for centuries, it must also be stressed that even in the United States, automation is by no means the only factor displace people from existing jobs. The increasing number of unneeded workers in recent years has been the result of much more simple and old-fashioned influences: farm laborers have been (2)......... out of work by bigger tractors, miners by the cheapness of oil, and railway-men by better roads. It is quite wrong, therefore, to think of automation as some new monster whose arrival threatens the existence of employment in the same way that the arrival of myxomatosis threatened the existence of the rabbit. Automation is one aspect of technological changes (changes in tastes, changes in social patterns, changes in organization) which (3)..... in certain jobs disappearing and certain skills ceasing to be required. And even in America, which has a level of technology and output per (4) .........much in advance of Britain’s, there is no evidence that the pace of change is actually speeding up. Nevertheless changes in the amount of labor needed to produce a certain output are proceeding fairly rapidly in America - and in (5)..........countries - and may proceed more rapidly in future. Indeed it is one of the main objects of economic policy.
 

(3).........................

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There are many different metaphors used to describe culture. My favorite one is the iceberg. I think, it demonstrates so vividly what can happen to us if we believe only in the visible and ignore or underestimate the invisible part. The hidden part of our culture is that part which we know instinctively because we absorbed it from childhood on. It's handed down to us from generation to generation. We could also say, it's the "thinking" and "feeling" part of culture: habits, assumptions, attitudes, desires, values, tastes, etc.
Now, if we are in a new culture, our customary evaluations and interpretations are likely not to be on target because we see everything through our own cultural glasses. Imagine yourself in a new city trying to get around with a map from your own hometown. It wouldn't take long for you to get lost and completely frustrated! When we experience an encounter in the new culture that puzzles us, the most common reaction is to judge it through our own cultural glasses. 
I want to propose an alternate approach to our initial gut reaction. Instead of immediately and instinctively judging a situation through our own glasses, we might first just pause and notice what is happening and then realize that this is a cultural learning situation. Remember the iceberg metaphor! The new culture becomes your mirror that shows you a hidden part of your own culture. What an opportunity for personal growth and new insight! You can compare two different approaches, that of the new culture and of your own culture. This gives you a choice. Now you can decide what fits best for you or even take the best from both sides. 

Which of the following can be inferred from the passage?

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Telecommuting-substituting the computer for the trip to the job-has been hailed as a solution to all kinds of problems related to office work. For workers, it promises freedom from the office, less time wasted in traffic, and help with child-care conflicts. For management, telecommuting helps keep high performers on board, minimizes tardiness and absenteeism by eliminating commutes, allows periods of solitude for high-concentration tasks, and provides scheduling flexibility. In some areas, such as Southern California and Seattle, Washington, local governments are encouraging companies to start telecommuting programs in order to reduce rush-hour congestion and improve air quality, but these benefits do not come easily. Making a telecommuting program work requires careful planning and an understanding of the differences between telecommuting realities and popular images.
Many workers are seduced by rosy illusions of life as a telecommuter. A computer programmer from New York City moves to the tranquil Adirondack Mountains and stays in contact with her office via computer. A manager comes into his Office three days a week and works at home the other two. An accountant stays home to care for child; she hooks up her telephone modem connections and does office work between calls to the doctor.
These are powerful images, but they are a limited reflection of reality. Telecommuting workers soon learn that it is almost impossible to concentrate on work and care for a young child at the same time. Before a certain age, young children cannot recognize, much less respect, the necessary boundaries between work and family. Additional child support is necessary if the parent is to get any work done.
Management, too, must separate the myth from the reality. Although the media has paid a great deal of attention to telecommuting, in most cases it is the employee’s situation, not the availability of technology, that precipitates a telecommuting arrangement.
That is partly why, despite the widespread press coverage, the number of companies with work-at-home programs or policy guidelines remains small.

Which of the following is an example of telecommuting as described in the passage?

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These days it is easy for most of us to get a hold of the latest books or magazines. We can go to bookstores, order them through the Internet, or borrow them from the local libraries. Now imagine having to walk miles and miles through a hot sandy desert just to borrow a book. This is the reality for people living in the villages of the Carissa region of Kenya in East Africa.
In 1996, librarian Wycliffe Oluoch used to spend each day waiting for people to come to borrow some of the 24,000 books in his library in Carissa. The library had no shortage of books, but people weren’t coming to read them. It was too much effort to walk through the desert just to borrow books. Oluoch racked his brain for ways to entice people into the library. After a lot of thought, he hit upon a great idea. If people wouldn’t come to the library, then he would have to take the library to them. Oluoch strapped boxes of books onto the backs of camels, and created the Mobile Camel Library.
Starting with three camels in 1996, but more recently expanding the service to six camels, the Mobile Camel Library serves over one million people. Twice a month, the camel library can be seen carrying books all around the Carissa region. These hard-working animals need little water and can carry up to 500 pounds of books across the sands. A librarian, a library assistant, a herdsman, and a lookout all travel with the camels. The lookout helps protect the books from thieves.
The children of Carissa love the camel library and appreciate Oluoch’s effort. Eleven-year-old Mohamud Mohamed reads his library books carefully and always returns them on time. He knows the Carissa library punishes people for losing books, just like any other library. However, the punishment is very stiff compared to that of other libraries. If a village loses a book, the camel library stops visiting.a

The phrase “racked his brain” probably means     .

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The first thing to do when you have a trip abroad is to check that your passport is valid. Holders of out–of–date passports are not allowed to travel overseas. Then you can prepare for your trip. If you don't know the language, you can have all kinds of problems communicating with local people. Buying a pocket dictionary can make a difference. You'll be able to order food, buy things in shops and ask for directions. It's worth getting one. Also there's nothing worse than arriving at your destination to find there are no hotels available. The obvious way to avoid this is to book in advance. This can save you money too. Another frustrating thing that can happen is to go somewhere and not know about important sightseeing places. Get a guide book before you leave and make the most of your trip. It's a must.
Then, when you are ready to pack your clothes, make sure they are the right kind. It's no good packing sweaters and coats for a hot country or T–shirts and shorts for a cold one. Check the local climate before you leave.
Also, be careful how much you pack in your bags. It's easy to take too many clothes and then not have enough space for souvenirs. But make sure you pack essentials. What about money? Well, it's a good idea to take some local currency with you but not too much. There are conveniently located cash machines (ATMs) in most big cities, and it's usually cheaper to use them than change your cash in banks. Then you'll have more money to spend. When you are at your destination, other travellers often have great information they are happy to share. Find out what they have to say. It could enhance your travelling experience.

The word "This" in paragraph 2 refers to     .

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage:

"What does a personal trainer do? I meet each Client to discuss what he or she is looking for. It could be anything from improving general fitness to losing, or in a few cases, (1)……  weight. I then devise a training programme for them which I think will help them to achieve their (2)….. . If they have had anything (3)… with them, say a back injury, I speak to a doctor who will (4)…. me what not to do. If someone eats and drinks too much, it’s easy to suggest they (5)…. , but if that doesn’t (6)....... , I look at their diet. I prefer to train on a one-to-one basis, though I do sometimes work with (7)…. if they are friends and want to train together. Who needs a personal trainer? I think most people do. A trainer will push you to try (8)….. . You achieve 20 percent more than you could train alone, no (9)…… how dedicated you are. I’ve got a lot of Americans on my books, and I actually prefer them. (10)….. most Britons, who still haven’t really got the idea, Americans know how to work out."

4. I speak to a doctor who will (4)…. me what not to do.

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Tides are the periodic rise and fall of the Earth’s waters that are caused by the Moon’s and Sun’s forces of gravity acting on the Earth .It is important to distinguish natural tidal phenomena from huge tsunamis , with the latter being caused by earthquakes and undersea volcanic eruptions.
The Moon is a main factor controlling ordinary tides. At the location on the Earth closest to the Moon, it exerts a powerful gravitational pull on the water. The resulting rise in the water produces higher tides. The water on the side of the Earth farthest away from the Moon also gets pulled by this lunar gravity, but not as strongly. The Earth itself has its own gravitational force that is constantly pulling waters downward, which is why the oceans do not simply bulge out toward the Moon. Ordinary tides usually feature high and low waters alternating in relation to the Earth’s rotation. Most shores around the world have high waters and two low waters for each day, which last about 24 hours and 50 minutes. The difference in height between the high water and low water is called the range of tide, and it can be quite dramatic in narrower bays
.Canada’s bays of Fundy , for example , commonly experiences the world’s most extreme tidal ranges , with daily differences of the 16 meters.
Two other types of tides are influenced by the Sun, which is much farther away from the Earth and exerts less than half of the Moon’s gravitational force. When the Sun, the Moon and the Earth are directly in line, the solar and lunar gravitational forces add up to produce higher spring tides. The range of spring tides is intensified, with higher water marks and lower low water marks. However, when the Moon is in the first or third quarter, it is at a 90–degree angle with the Sun in relation to the Earth .The opposing solar and lunar forces partially cancel each other out, and the result is a lower tide. This is called a neap tide, which comes twice a month and has lower high water marks and higher low water marks. The range of neap tides is minimum.
Some tides do not occur over water at all. The solid body of the Earth has slight elasticity, so lunar and solar gravity cause it to stretch very subtly. These changes in the Earth’s shape, although imperceptible to humans, are known as Earth tides.
Another tidal phenomenon, atmospheric tides, is caused by the Sun’s heating of the Earth’s atmosphere. Like ordinary tides, they usually occur over 12–hour periods.

Besides ordinary tides, how many other types of tide are mentioned in the passage ?

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        The tradition of gift giving is a worldwide (1)_________ that is said to have been around since the beginning of human beings. Over time, different cultures have developed their own gift giving customs and traditions.
         In France, the gift of wine for the hostess of a dinner party is not an appropriate gift as the hostess would prefer to choose the vintage for the night. In Sweden, a bottle of wine or flowers are an appropriate gift for the hostess. In Viet Nam, a gift of whisky is appropriate for the host, and some fruit or small gifts for the hostess, children or elders of the home. Besides, gifts should never be wrapped in black paper because this color is unlucky and associated with funerals in this country. Gifts (2)____________symbolize cutting such as scissors, knives and other sharp objects should be avoided because they mean the cutting of the relationship. Also, in some countries you should not open the gift in front of the giver and in (3)__________ it would be an insult if you did not open the gift.
       Beyond the gift itself, give careful consideration to the manner in which it is presented. Different cultures have different customs regarding how a gift should be offered - using only your right hand or using both hands, (4)_____. Others have strong traditions related to the appropriate way to accept a gift. In Singapore, for instance, it is the standard to graciously refuse a gift several times before finally accepting it. The recipient would never unwrap a gift in front of the giver for fear of appearing greedy.
       Understanding these traditions and customs, as well as taking time to choose an appropriate gift, will help you to avoid any awkwardness or (5)__________ as you seek to build a better cross-cultural relationship.

(5)..................

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Since the first Paralympic Games in Rome in 1960, swimming has been one of its main sports.
The thrill of competition aside, swimming offers many benefits including strengthening the cardiovascular systems and the major muscle groups of both the upper and lower body. It also develops flexibility in the muscles and joints as the swimmer performs a wide range of motion against the water's resistance. It is an activity that keeps your heart rate up but takes some of the stress that is common in impact sports off the body; injuries don't occur as easily. The water's buoyancy evenly distributes and supports the weight of the body; there is no danger of falling, and there are no impact forces on the residual limb. Swimmers who have disabilities endorse the sport because it gives them a sense of freedom. They don't have to rely on any supportive device, such as a wheelchair, to assist them. They are independent. They are only judged on their times and whether those times are dropping. “Water is one of the big equalizers,” said Queenie Nichols, long-time Paralympic swim coach. "One of the phrases I heard since I got involved in this is that we are all equal in the water and that is really true. Athletes with disabilities, from below-knee amputations to severe quads, can compete and compete successfully.”
While it is not essential to begin swimming at an early age to become an elite athlete, Nichols believes that the sooner an individual becomes comfortable in the water, the better. "I think starting at about 5 years old is a good age to get children involved, in the pool at least once a week. Keep it fun for them until they show an interest in growing with a Club," she said.
“Most clubs that belong to USA Swimming or YMCAs offer coaching and training at the appropriate level for age and experience,” Nichols said. "We suggest aspiring athletes participate with an able-bodied club at first because of the greater number of individuals they will compete with."
Typically, swimmers in this introductory/ foundation phase, usually aged 5 to 8 or 9, remain there for about 5 years before transitioning to the next level, which includes more advanced drills and stroke efficiency. Athletes with disabilities who join swimming clubs benefit from better sport-specific coaching, more rigorous training, more competition in practice, and higher expectations than they are likely to receive in other settings. Other benefits include socialization opportunities, greater independence in activities of daily living, and improved ability to cope with limitations imposed by disabilities.

It can be inferred from the phrase “Water is one of the big equalizers” is     .

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Archimedes’s Principle is a law of physics that states that when an object is totally or partially immersed in a fluid, it experiences an upthrust equal to the weight of the fluid displaced. The principle is most frequently applied to the behaviour of objects in water, and helps to explain floating and sinking, and why objects seem lighter in water. It also applies to balloons.
The key word in the principle is “upthrust”, which refers to the force acting upward to reduce the apparent weight of the object when it is under water. If, for example, a metal block with a volume of 100 cm3 is dipped in water, it displaces an equal volume of water, which has a weight of approximately 1 N (3.5 oz). The block therefore seems to weigh about 1 N less.
An object will float if its average density is less than that of water. If it is totally submerged, the weight of the water it displaces (and hence the upthrust on it) is greater than its own weight, and it is forced upward and out of water, until the weight if water displaced by submerged part is exactly equal to the weight of the floating object. Thus a block of wood with a density six tenths that of water will float with six tenths of its volume under water, since at that point the weight of fluid displaced is the same as the blocks’s own weight. If a dense material is made into a suitable shape, it will float because of Archimedes’s principle. A ship floats, whereas a block of iron of the same mass sinks.
It is also because of Archimedes’s principle that ships float lower in the water when they are heavily loaded (more water must be displaced to give the necessary upthrust). In addition, they cannot be so heavily loaded if they are to sail in fresh water as they can if they are to sail in the sea, since fresh water is less dense than sea water, and so more water must be displaced to give the necessary upthrust. This means the ship is lower in the water, which can be dangerous in rough weather.

Archimedes’ Principle explains why     

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A leading question among anthropologists is: what exactly led to the development of human cities? Basically, modern humans have existed on earth for over 100,000 years. Yet it is only in the last 8,000 years that they have begun to gather in significant numbers and form cities. Prior to that period, humans existed in small family or tribal groups, generally consisting of fewer than 100 individuals. What, then, led humans to make the dramatic shift from living in small groups to living in large, organized cities? It seems that the development of cities required a particular set of circumstances.
First, it required a minimum population density. For much of their early history, humans existed only in small numbers. This is due to the fact that early humans relied on hunting and gathering wild foods for their survival. Even the most fertile land would only support a relatively small number of predators, so it was not until humans began to practice agriculture that they were able to gather in large enough numbers to form cities.
Furthermore, the development of a city could only be possible if a large number of people shared a common language, culture and religion. Without such unifying factors, a cooperative, peaceful existence among large numbers of people would have been impossible.
Finally, it seems that early humans needed to be faced with a large problem, which one small group of individuals could not solve on its own. Only when large-scale cooperation was needed to overcome a problem would humans come together to form cities.

The word "circumstances" in paragraph 1 mostly means     .

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:
When people hear the word “city”, they usually imagine concrete, neon signs, and lots of air pollution. Thanks to some clever and concerned architects, this image is starting to change. The concept of green cities aims to bring some beauty from rural environments into urban areas. It is not only about looking better though. Green cities are also trying to improve the efficiency of cities and raise the standard of living for people who stay in them.
The term “green cities” refers to cities where builders take into account several environmental factors before that city is constructed or redesigned. For starters, green cities are designed to be more physically appealing than traditional cities from the past. In addition, the mobility of citizens should be considered, so public transportation can be more convenient and travel time to work can be reduced. Energy sources should also be evaluated with the goal of minimizing air pollution.
When it comes to going green, the city of Barcelona is far ahead of its time. Since 1859, its designers have consciously tried to create sustainable urban designs. Then in 1992, the city received a well-deserved makeover before hosting the Olympic Games. In recent years, Barcelona has upgraded its transportation system. This has reduced air pollution as more and more workers are using public transportation instead of their own vehicles. Barcelona also boasts one of the best recycling programmes in the world. Visitors will find clear, colour-coded trash bins throughout the city where they can put all of their materials.
It is no secret in Portland, Oregon is one of the greenest cities in the US. Since 1903, it has been an example of what American cities can accomplish with careful planning. Instead of filling its area with office buildings, Portland has plenty of green space for activities. There are 119 kilometres of running, hiking, and bike trails that allow citizens to experience the great outdoors. The city also offers residents creative energy plans that give them the opportunity to pay a bit extra for clean energy sources. For about
$3 to $9 extra each month, homeowners can choose solar or wind power and help the environment.
These are only a small sampling of the green cities around .the world. As more people experience the pleasure of visiting green cities, it seems certain that the trend of urban areas going green will continue far into the future.

What does the term “mobility” in paragraph 2 mean?

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. 
Called the ‘Red Planet,’ Mars is roughly half the size of Earth, and one of our closest neighboring planets. Though Mars is the most Earth-like of any other planet, the two are still worlds apart. Living on Mars has been the stuff of science fiction for decades. However, can humans really live on Mars? Will it ever be possible or safe? NASA (the National Aeronautics and Space Administration) hopes to find out. NASA researchers on Earth are conducting several experiments together with the International Space Station (ISS) to study the health and safety issues that may tell us if life on Mars is possible.
Food and oxygen would be the main necessities for travelers living extended periods on Mars. The need to grow plants, which provide both food and oxygen, would be a key. But the decreased gravity and low atmospheric pressure environment of the planet will stress the plants and make them hard to grow. However, space station crews are growing plants in controlled environments in two of the station’s greenhouses. They take care of the plants, photograph them, and collect samples to be sent back to Earth. Researchers then use the data to develop new techniques that will make it possible to grow plants successfully in space. 
Another concern for space travelers is the health hazards posed by the effect of space radiation on humans. A spacecraft traveling to Mars would be exposed to large amounts of radiation. Since human exposure to such intense radiation would mean certain death, the spacecraft used for such travel would have to protect the humans on the inside of the craft from exposure. Researchers are using special machines inside the crew areas of the International Space Station to carefully watch radiation levels. NASA scientists, who have maintained radiation data since the beginning of human space flight, continue to learn about the dangers it poses. Researchers use the station to test materials that could be used in making a spacecraft that could successfully travel to Mars.
Will it ever be safe for humans to live on Mars? It is still too early to say. But thanks to the dedicated researchers of NASA and the results of ISS experiments, we are getting closer to knowing every day. 
(Adapted from “Select Readings –Intermediate Tests” by Linda Lee and Erik Gundersen)

The word “hazards” in paragraph 3 is closest in meaning to ____________.