Read the passage below and choose one correct answer for each question.

In the future, maybe all cars that run on petrol will be replaced by solar cars, which have been around for a while, but with recent developments in solar car design and the measurement of photovoltaic cells becoming smaller, the dream of a truly efficient solar car is more reality than fantasy. A solar car is a vehicle powered by photovoltaic cells, also called solar cells, which convert sunlight (light energy) into electrical energy. As a source of energy on earth, there is nothing like the sun: in a mere one thousandth of one second (.001) , the sun emits enough energy to fulfill our planet's energy needs for the next 5,000 years. It is a staggering fact, and an exciting one. Since the energy from the sun is responsible for renewable resources such as wind, tides, and heat, solar energy seems to offer the brightest future for not only cars, but for the entire energy crisis. Despite the appearance that solar energy may be the least, feasible among the current crop of alternative fuel propositions, new solar powered devices and more specifically solar powered cars are beginning to be developed. How do Solar Cars work?

The photovoltaic cells absorb photons from sunlight. This action generates heat, which the cells then convert into electrical energy and stores in an onboard battery. This process of conversion is called the photovoltaic effect. Not surprisingly, such a vehicle has zero emissions, and is very environmentally friendly. Unfortunately, at the moment photovoltaic cells are extremely inefficient, yet as time progresses the efficiency of these cells will grow. This will make solar energy and solar cars the fuel and car of the future - a closer reality.

The photovoltaic effect is _____________ 

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.
It is a well-known fact that Japanese people have a longer life expectancy than the population of most other countries. A (1)..................report shows that the Japanese also expect to remain healthier for longer. Scientists are trying to work out what keeps elderly Japanese people so healthy, and whether there is a lesson to be learnt from their lifestyles. Should we (2).........any changes to our eating habits, for instance, or go jogging each day before breakfast? Is there some secret (3)........ in the Japanese diet that is particularly beneficial for the human body? Although the prospect of a longer , healthier life is a good thing for the individual, it can actually create a social problem. The number of people over the age of 65 in the population has doubled in the last 50 years and that has increased pension and medical costs. Japan could soon be (4)........... an economic problem: there are more elderly people who need to be looked after. And relatively fewer younger people working and paying taxes to support them. One solution could be to (5)............ retirement age from 65 to 70 . After all, the elderly have a great deal to contribute. If they continue to be active in society, younger generations will have the chance to learns more from their wisdom and experience.
(1).............................

Basic to any understanding of Canada in the 20 years after the Second World War is the country’s impressive population growth. For every three Canadians in 1945, there were over five in 1966. In September 1966 Canada’s population passed the 20 million mark. Most of this surging growth came from natural increase.  The depression of the 1930s and the war had held back marriages, and the catching-up process  began after 1945. The baby boom continued through the decade of the 1950s, producing a population increase of nearly fifteen percent in the five years from 1951 to 1956. This rate of increase had been exceeded only once before in Canada’s history, in the decade before 1911, when  the prairies were being settled. Undoubtedly, the good economic conditions of the 1950s  supported a growth in the population, but the expansion also derived from a trend toward earlier marriages and an increase in the average size of families. In 1957 the Canadian birth rate stood at  28 per thousand, one of the highest in theworld. 
After the peak year of 1957, the birth rate in Canada began to decline. It continued falling  until in 1966 it stood at the lowest level in 25 years. Partly this decline reflected the low level of births during the depression and the war, but it was also caused by changes in Canadian society. Young people were staying at school longer, more women were working; young married couples  
were buying automobiles or houses before starting families; rising living standards were cutting down the size of families. It appeared that Canada was once more falling in step with the trend  toward smaller families that had occurred all through the Western world since the time of the  IndustrialRevolution. 
Although the growth in Canada’s population had slowed down by 1966 (the increase in the  first half of the 1960s was only nine percent), another large population wave was coming over the horizon. It would be composed of the children who were born during the period of the high birth  rate prior to 1957.

The phrase “prior to” in bold is closest in meaning to .......................

Basic to any understanding of Canada in the 20 years after the Second World War is the country’s impressive population growth. For every three Canadians in 1945, there were over five in 1966. In September 1966 Canada’s population passed the 20 million mark. Most of this surging growth came from natural increase.  The depression of the 1930s and the war had held back marriages, and the catching-up process  began after 1945. The baby boom continued through the decade of the 1950s, producing a population increase of nearly fifteen percent in the five years from 1951 to 1956. This rate of increase had been exceeded only once before in Canada’s history, in the decade before 1911, when  the prairies were being settled. Undoubtedly, the good economic conditions of the 1950s  supported a growth in the population, but the expansion also derived from a trend toward earlier marriages and an increase in the average size of families. In 1957 the Canadian birth rate stood at  28 per thousand, one of the highest in theworld. 
After the peak year of 1957, the birth rate in Canada began to decline. It continued falling  until in 1966 it stood at the lowest level in 25 years. Partly this decline reflected the low level of births during the depression and the war, but it was also caused by changes in Canadian society. Young people were staying at school longer, more women were working; young married couples  
were buying automobiles or houses before starting families; rising living standards were cutting down the size of families. It appeared that Canada was once more falling in step with the trend  toward smaller families that had occurred all through the Western world since the time of the  IndustrialRevolution. 
Although the growth in Canada’s population had slowed down by 1966 (the increase in the  first half of the 1960s was only nine percent), another large population wave was coming over the horizon. It would be composed of the children who were born during the period of the high birth  rate prior to 1957.

It can be inferred from the passage that before the Industrial Revolution .......................

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.
Students and jobseekers are keen to get onto the course or into the workplace of their choice hope that voluntary work will help them stand out from the crowd. This chance to (1)........ experience-personally and professionally-is high on the wish list of young people. A survey carried out last year revealed that young and old alike said volunteering had improved their lives, particularly those (2)........in conservation or heritage work. Businesses recognize its importance and get to raise their profile in the community, while staff get a break from their daily routine to develop “soft skill”, (3)......initiative and decision-making. One volunteering organization is conduct another survey to find out if volunteering does make a difference in the workplace, or if it is something businesses do simply to improve their (4)....... Not only are business-sponsored placements becoming more common, the government is also investing money and aiming to (5)..... volunteers. The push is clear to make volunteering as attractive as possible to everyone. And the more people who participate, the more act fulfils its direction of making the world a better place.
(1).............................

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 from 46 to 50.
We all want to live in a clean and green world and breathe pollution free air. For this kind of environment we desperately need a fossil fuel free world. Scientists are toiling hard to come up (46) alternative fuels which can replace conventional fuels. One such study was presented at the 237th National Meeting of the American Chemical Society. This study throws interesting light on the first economical, eco- friendly process to (47) algae oil into biodiesel fuel. The scientists are quite hopeful that one day America will become independent (48)  fossil fuels. Ben Wen is the (49)      researcher and vice president of United Environment and Energy LLC, Horseheads, N.Y. According to him, “This is the first economical way to produce biodiesel from algae oil. It costs much less than conventional processes because you would need a much smaller factory, there (50) no  water disposal costs, and the process is considerably faster.
(46)...............

Read the passage below and choose the best answer (A, B, C or D ) to each question.

The movement of people towards cities has accelerated in the past 40 years, particularly in the less developed regions, and the share of the global population living in urban areas has increased from one third in 1960 to 47% (2.8 billion people) in 1999. The world's urban population is now growing by 60 million persons per year, about three times the increase in the rural population.

Increasing urbanisation results about equally from births in urban areas and from the continued movement of people from the rural surround. These forces are also feeding the sprawl of urban areas as formerly rural peri-urban settlements become incorporated into nearby cities and as secondary cities, linked by commerce to larger urban centres, grow larger.

The proportion of people in developing countries who live in cities has almost doubled since 1960 (from less than 22% to more than 40%), while in more-developed regions the urban share has grown from 61% to 76%. There is a significant association between this population movement from rural to urban areas and declines in average family size.

Asia and Africa remain the least urbanised of the developing regions (less than 38% each). Latin America and the Caribbean is more than 75% urban, a level almost equal to those in Europe, Northern America and Japan (all are between 75 and 79%).

Urbanisation is projected to continue well into the next century. By 2030, it is expected that nearly 5 billion (61%) of the world's 8.1 billion people will live in cities. The less-developed regions will be more than 57% urban. Latin America and the Caribbean will actually have a greater percentage of inhabitants living in cities than Europe will.

Globally, the number of cities with 10 million or more inhabitants is increasing rapidly, and most of these new 'megacities' are in the less-developed regions. In 1960, only New York and Tokyo had more than 10 million people. By 1999, there were 17 cities of more than 10 million people around the world, 13 of these were in less-developed regions. It is projected that there will be 26 megacities by 2015, 22 in less-developed regions (18 will be in Asia); more than 10% of the world's population will live in these cities, up from just 1.7% in megacities in 1950.

What percentage of the world population living in urban areas in 1960?

Read the passage below and choose the best answer (A, B, C or D ) to each question.

Higher education, also called tertiary, third stage or post secondary education, is the non-compulsory educational level following the completion of a school providing a secondary education, such as a high school, secondary school. Tertiary education is normally taken to include undergraduate and postgraduate education, as well as vocational education and training. Colleges and universities are the main institutions that provide tertiary institutions. Tertiary education generally results in the receipt of certificates, diplomas, or academic degrees.

Higher education includes teaching, research and social services activities of universities, and within the realm of teaching, it includes both the undergraduate level and the graduate level. Higher education in that country generally involves work towards a degree-level or foundation degree qualification. It is therefore very important to national economies, both as a significant industry in its own right, and as a source of trained and educated personnel for the rest of the economy.

_________is important to national economies.

Fill in each numbered blank with one suitable word or phrase.

Over the next 20 to 50 years, it will become harder to tell the (1) _____ between the human and the machine. All body (2) _____ will be replaceable. Computers will function like the human (3) _____ with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (4) _____ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our (5) _____ and thoughts, to the new body. Then we can choose to live for as (6) _____ as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will figure out (7) _____ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want. Miniature robots will be built to travel through your blood (8) _____ and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will (9) _____ a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (10) _____ your illness, or to prove to your employer that you really, were sick.

(8) _____

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

"Oxford engineer, David Heston, is planning an interesting cycle ride this summer - (1)….. the Sahara Desert. During his five-week journey, temperatures (2)…..  a sizzling 45°. David, 19, of Church Road, Dorchester, hopes to complete the first summer (3)…… of the desert on a tandem (bicycle for two people). “It does sound a bit (4)….. he said. (5)…. there are good reasons. It’s part of a research expedition about finding ways of (6)…. the spread of the desert. The Sahara is getting bigger and bigger and that’s bad (7)…… .
David is taking five Cambridge University friends with him. One will join him on the tandem and the others will drive two Land Rovers in support, travelling from (8)….. of Algeria to Agadez in the South. The journey is not without its problems, and (9)….. a 600-mile section (10)…..has no roads and no water."

8. One will join him on the tandem and the others will drive two Land Rovers in support, travelling from (8)….. of Algeria to Agadez in the South.

Read the following passage and choose the correct answer for each of the blanks.

Revising for exams is not as easy as it looks. You will need to work out which routine suits you best, and then stick to it. Some people like studying at night when it’s quiet, whereas others find the early morning is a good time to get things done. You might enjoy (1)…….. to music while you revise, but this can be (2)……... Can you really concentrate (3)……….. two things at once? So think (4)……… you turn your radio on. Your (5)…….. is also important while you are revising. This may be a more than usually (6)………. period of your life, when you should take extra care to eat properly. No missed meals, or junk food, or (7)…….cups of coffee! Get plenty of exercise as well. If you have got fed up with (8)……. you’re doing, or find it hard to concentrate, go for a walk to clear your head. (9)……. exercise will help to keep your body fit and your brain working (10)………… Finally, you also need to take time off. Go out occasionally, see your friends, and make time to relax. Then you will return to your studies fresh and full of enthusiasm.

(4) ______

Choose the best answer: 
In the western customs ...(18)...hands is the customary form of greeting, but in China a nod of the head or slight bow is sufficient. Hugging and kissing when greeting are uncommon. Business cards are often ...(19)...and yours should be printed in your own language and in Chinese. Also, it is more respectful to present your card or a gift or -any other article using both hands. The Chinese are ...(20)...applauders. You may be greeted with group clapping, even by small children. When a person is applauded in this practice it is the custom for that person to return the applause or a "thank you." When walking in public places, direct eye contact and staring is uncommon in the larger cities, especially in those areas accustomed to foreign visitors. ...(21)... , in smaller communities, visitors may be the subject of much curiosity and therefore you may notice some stares. Generally speaking, the Chinese are not a touch-oriented society, especially true for visitors. So, avoid ...(22)... or any prolonged form of body contact. Public displays of affection are very rare. On the other hand, you may 3note people of the same sex walking hand-in-hand, which is simply a gesture of friendship.

   Do not worry about a bit of pushing and shoving in stores or when groups board public buses or trains. In this case, Apologies are neither offered or expected. The Chinese will stand much closer than Westerners.

21: 

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.
Rowing is a sport in which athletes race against each other on rivers, lakes or on the ocean,(1) ......... on the type of race and the discipline. The boats are propelled by the reaction forces on the oar blades as they are pushed against the water. The sport can be both recreational, focusing (2)............ learning the techniques required, and competitive where overall fitness plays a large role. It is also one of the oldest Olympic sports. In the United States, Australia and Canada, high school and collegial rowing is sometimes referred to as crew.
(3) .......... rowing, the athlete sits in the boat facing backwards, towards the stern, and uses the oars which are held in place by the oarlocks to propel the boat forward, towards the bow. It is a demanding sport requiring strong core balance as well as physical (4).......... and cardiovascular endurance.
Since the action of rowing has become fairly popular throughout the world, there are many different types of (5)......... _ . These include endurance races, time trials,  stake racing, bumps  racing, and the side-by-side format used in the Olympic Games. The many different formats are a result of the long history of the sport, its development in. different regions of the world, and specific local requirements and restrictions.
(2)......................

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 blanks.

Speech is one of the most important communicating (1) ______. It consists of far more than just making noises. To talk and also to be understood by other people, we have to speak a language, that is, we have to use combinations of sounds that everyone agrees to stand for a particular object or idea. Communication would be impossible if everyone made up their own language.

Learning a language properly is very (2)______ . The basic vocabulary of English is not very large, and not only about 2,000 words are needed to speak it quite (3)______ but the more idea you can express the more precise you can be about their exact meaning.

Words are the (4)______ thing we use in communicating what we want to say. The way we say the words is also very important. Our tone of voice can express many emotions and show whether we are pleased or angry, for instance.

(3) ______

Fill in each numbered blank with one suitable word or phrase.

Over the next 20 to 50 years, it will become harder to tell the (1) _____ between the human and the machine. All body (2) _____ will be replaceable. Computers will function like the human (3) _____ with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (4) _____ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our (5) _____ and thoughts, to the new body. Then we can choose to live for as (6) _____ as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will figure out (7) _____ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want. Miniature robots will be built to travel through your blood (8) _____ and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will (9) _____ a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (10) _____ your illness, or to prove to your employer that you really, were sick.

(4) _____

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.

   On March 15, Dunes View Middle School held a contest for school bands. Student bands tried out for the opportunity to perform at the school picnic, which will be held at the end of June. The winner of the contest was the band called Four Square. “We’re very proud that we won the contest and are excited to perform at the picnic,” says Peter Zandt, who plays the guitar in the band. “And since we hope to perform someday at other local places, like restaurants and parks, this will be a great first step.”

   The contest was the creation of music teacher Mr. Lopez and drama teacher Ms. Cho. The two thought of the idea while discussing recent years’ school picnics. “The picnic is one of the biggest events of the year, but it has become a bit formulaic ,” said Ms. Cho. “The activities are the same every year. We thought that a performance by a student band would make the school picnic more interesting and fun.” Mr. Lopez, Ms. Cho, and three other teachers judged the contest, which took place in the gym. Eight student bands signed up to audition. The bands varied in their musical forms: there were several rock bands, a folk band, and even a jazz band. “I’m disappointed that my band didn’t win, but I think the judges made the right choice,” says student Marisol Varga, a member of the folk trio called The Bell Girls. “Four Square is really good.” To see if the bands could present a wide range of musical skills, the teachers asked them each to prepare two songs: one song with original words, and another in which students played instrumental music only. The judges finally chose the band Four Square as the winner of the contest. Four Square is a rock band with an unusual twist: it includes a violin player! The members of Four Square write their own songs and practice three times a week after school. Students and teachers agreed that the band competition was a big success. All are looking forward to the school picnic in June.

According to the article, what does the band Four Square hope to do in the future?

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.
I live on the first floor of a house that has been (1).......... into three flats. Five months ago, a couple moved into the flat above and since then my life has been a nightmare. They get up at 6 a.m and make a terrible noise. They listen to the radio at top (2)......... , talk loudly and stamp on the floor. In the evening they play the same record on their stereo over and over again. It’s beginning to (3)......... me mad. I’ve tried turning my own stereo up to (4)............ out the noise but I like peace and quiet and find loud music stressful. I tried to talking to them but it hasn’t done any good. I realize I should live and (5)............. live , but I have begun to have quite irrational revenge fantasies about them – like switching off their electricity or deliberately making a lot of noise late at night when I know they are asleep. What on earth can I do?
(1).............................

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.
Do you ever wish you were more optimistic, some one who always (36)....... to be successful? Having some one around who always fears the worst isn’t really a lot of (37)........we all know someone who sees a single cloud on a sunny day and says: “It looks like rain.” But if you catch yourself thinking such things, it’s important to do something (38) ..........it. You can change your view of life, (39)....... to psychologists, it only takes a little effort, and you’ll find life more rewarding as a (40).......... Optimism, they say, is partly about self-respect and confidence, but it’s also a more positive way of looking at life and all it has to offer . Optimists are more (41).... to start new projects and generally more prepared to take risks.
Upbringing  is obviously very important in forming your (42).... to the world. Some people are brought up to (43)..... too much on others and grow up forever blaming other people when anything goes wrong. Most optimists, on the (44).......... hand, have been brought up not to regard failure as the end of the world-they just (45)......... with their lives
(41)...........................

Animation traditionally is done by hand-drawing or painting successive frame of an object,  each slightly different than the proceeding frame. In computer animation, although the computer  may be the one to draw the different frames, in most cases the artist will draw the beginning and  ending frames and the computer will produce the drawings between the first and the last drawing.  This is generally referred to as computer-assisted animation, because the computer is more of a  helper than an originator. 
In full computer animation, complex mathematical formulas are used to produce the final  sequences of pictures. These formulas operate on extensive databases of numbers that defines the  objects in the pictures as they exist in mathematical space. The database consists of endpoints,  and color and intensity information. Highly trained professionals are needed to produce such  effects because animation that obtains high degrees of realism involves computer techniques from three-dimensional transformation, shading, and curvatures. 
High-tech computer animation for film involves very expensive computer systems along  with special color terminals or frame buffers. The frame buffer is nothing more than a giant image  memory for viewing a single frame. It temporarily holds the image for display on the screen. 
A camera can be used to film directly from the computer’s display screen, but for the  highest quality images possible, expensive film recorders are used. The computer computers the  positions and colors for the figures in the picture, and sends this information to the recorder,  which captures it on film. Sometimes, however, the images are stored on a large magnetic disk  before being sent to the recorder. Once this process is completed, it is replaced for the next frame.  When the entire sequence has been recorded on the film, the film must be developed before the  animation can be viewed. If the entire sequence does not seem right, the motions must be  corrected, recomputed, redisplayed, and rerecorded. This approach can be very expensive and time – consuming. Often, computer-animation companies first do motion tests with simple computer  generated line drawings before selling their computers to the task of calculating the high resolution, realistic-looking images.

The word “task” in the fourth paragraph is closest in meaning to ......................

Choose the item among A, B, C or D that best answers the question about the passage:

"Until recently, the ‘Science of the future’ was supposed to be electronics and artificial intelligence. Today it seems more and more likely that the next breakthrough in technology will be brought about through a combination of those
two Sciences with organic chemistry and genetic engineering. This Science is the combination of biotechnology.
 Organic chemistry enables us to produce marvelous synthetic materials. However, it is still difficult to manufacture anything that has the capacity of wool to conserve heat and also to absorb moisture. Nothing that we have been able to produce so far comes anywhere near the combination of strength, lightness, and flexibility that we find in the bodies of ordinary insects.
 Nevertheless, scientists in the laboratory have already succeeded in ‘growing’ a material that has many of the characteristics of human skin. The next step may well be ‘biotech heart and eyes’ which can replace diseased organs in human beings. This will not be rejected by the body, as in the case with organs from humans.
 The application of biotechnology to energy production seems even more promising. In 1996, the famous science-fiction writer Arthur c. Clarke, many of whose previous predictions have come true, said that we may soon be able to develop remarkably cheap and renewable sources of energy. Some of these power sources will be biological. Clarke and others have warned us repeatedly that sooner or later we will have to give up our dependence on non-renewable power sources. Coal, oil and gas are indeed convenient. However, using them also means creating dangerously high levels of pollution. It will be impossible to meet the growing demand for energy without increasing that pollution to catastrophic levels unless we develop power sources that are both cheaper and cleaner."

1. According to the text, the Science of the future is likely to be?

Animation traditionally is done by hand-drawing or painting successive frame of an object,  each slightly different than the proceeding frame. In computer animation, although the computer  may be the one to draw the different frames, in most cases the artist will draw the beginning and  ending frames and the computer will produce the drawings between the first and the last drawing.  This is generally referred to as computer-assisted animation, because the computer is more of a  helper than an originator. 
In full computer animation, complex mathematical formulas are used to produce the final  sequences of pictures. These formulas operate on extensive databases of numbers that defines the  objects in the pictures as they exist in mathematical space. The database consists of endpoints,  and color and intensity information. Highly trained professionals are needed to produce such  effects because animation that obtains high degrees of realism involves computer techniques from three-dimensional transformation, shading, and curvatures. 
High-tech computer animation for film involves very expensive computer systems along  with special color terminals or frame buffers. The frame buffer is nothing more than a giant image  memory for viewing a single frame. It temporarily holds the image for display on the screen. 
A camera can be used to film directly from the computer’s display screen, but for the  highest quality images possible, expensive film recorders are used. The computer computers the  positions and colors for the figures in the picture, and sends this information to the recorder,  which captures it on film. Sometimes, however, the images are stored on a large magnetic disk  before being sent to the recorder. Once this process is completed, it is replaced for the next frame.  When the entire sequence has been recorded on the film, the film must be developed before the  animation can be viewed. If the entire sequence does not seem right, the motions must be  corrected, recomputed, redisplayed, and rerecorded. This approach can be very expensive and time – consuming. Often, computer-animation companies first do motion tests with simple computer 
generated line drawings before selling their computers to the task of calculating the high resolution, realistic-looking images.

The word “they” in the second paragraph refers to .