Read the following passage and choose the best answer (A, B, C, D):
Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid-1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were able to study the genetic differences between races. Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes! Africans are more closely related to Europeans than any other two groups despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of Nord America (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genets differences make one race superior to another is nothing but a tall story. The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic, for example, then is a much higher incidence of sickle cell anemia among black populations that any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S, Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer. Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3 in, while women hit the big time with an impressive 5ft 3 in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11 in tall. Genetic differences may help US to tailor health service to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior to another. In fact, our modern scientific understanding of human genetic diversity flit in the face of almost all our social stereotypes.
7. What does the writer mean with the idiom "hit the big time" in the third paragraph.

Choose the best answer:
John was reading a book when I ____ him.

People should eat _____ and do ________ to reduce the risk of heart disease.

(447)_____

Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks .
             WOMEN IN THE WORKPLACE
Some people think of 'traditional ' gender roles as being like a 1950s TV sitcom: Dad puts (1)..............his suit and goes to the office, while Mum, in her apron, stays at home and (2)............. the housework. But for most of human history, it has taken the efforts of both men and women, whether working in an office (3)..................... in the fields, to look after the family. And that's the situation to which we now seem to be returning.
By 2050, women will make up 47% of the workforce in the United States, up from 30% in 1950. But some experts are predicting that, at (4)................. in the short term, the number of women in the workforce may actually overtake the number of men. What's the reason? During the economic recession that began in 2008, many jobs disappeared from industries traditionally dominated by male workers, such as manufacturing. Unless many more manual manufacturing jobs (5)........... , it may be that women, who traditionally work in healthcare, education and other service industries, will take the lead in the labour market.

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

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 from 36-42
From smartphones and tablets to apps and social media, society is ambushed from all sides with technology. Naturally, all generations embrace it differently, with younger “digital natives” generally being more connected, more switched-on and more tech literate than older age groups.
According to Pew Research, 92% of Millennials (born 1981–1996) own smartphones, compared with 85% of Gen Xers (born 1965–1980) and 67% of Baby Boomers (born 1946–1964). In terms of tech behavior, older generations tend to use their phones mostly for making calls, whereas for younger generations, a phone is their digital window to the world. Phones are used for social media, going online, texting, emailing, playing games, listening to music, and recording and watching videos.
The daily media consumption of different generations also vastly differs. Gen Z and Millennials favor streaming and online services, with 46% of teens saying they use Netflix compared to 31% of those aged over 16. Furthermore, 16-24s spend 30% of their downtime watching TV or video, compared to 40% of time spent on these activities by the average UK adult. Boomers spend a whopping 344 minutes a day watching regular TV, significantly more than any other age group.
Size also matters more depending on your decade of birth. Younger generations prefer smaller screens sizes, opting for a smartphone as their go-to tech, while Generation X and technology newbies - the Boomers, are going bigger, owning more desktops and tablets. Always in the front of the queue for the hottest tech, younger generations see technology as an integral part of their existence, and since few Millennials and Gen Z can remember a time without social media, they’re more fearless and carefree when it comes to technology. So much so, that a LivePerson report revealed 65% of Millennials and Gen Z interact more with each other online than they do in the real world.
Fundamentally, these behaviors and preferred technologies combine to create a technological generation gap, where employees, shaped by their personal experiences, demonstrate different levels of ability and willingness to adopt new tech. Constantly chasing the next update or device, switched on Millennials and Gen Z are quick to lap up the latest apps, games, and platforms, while Gen X and Boomers are generally slower to embrace technology - both at home and in the workplace.

Which of the following statements is TRUE, according to the passage?

The volume of traffic in many cities in the world today continues to expand. This (1)________ many problems, including serious air pollution, lengthy delays, and the greater risk (2) ________ accidents. Clearly, something must be done, but it is often difficult to persuade people to change their habits and leave their cars at home. One possible approach is to make it more expensive for people to use their cars be increasing changes for parking and bringing in tougher fines for anyone who (3) ________ the law. In addition, drivers could be required to pay for using particular routes at different times of the day. This system, also known as ‘road pricing’, is already being introduced in a number of cities, using a special electronic card (4) ________ to windscreen of the car. Another ways of dealing with the problem is to provide cheap parking on the outskirts of the city, and strictly control the number of vehicles allowed into the centre. Drivers and their passengers then use a special bus service for the final stage of their journey. Of course, the most important (5) ________ is to provide good public transport. However, to get people to give up the comfort their cars, public transport must be felt to be reliable, convenient and comfortable, with fares charged at an acceptable level.

(58)________

Read the following passage and choose the best answer (A, B, C, D):
Of all modern instruments, the violin is apparently one of the simplest. It consists in essence of a hollow, varnished wooden sound box, or resonator, and a long neck covered with a figerboard, along which four strings are stretched at high tension. The beauty of design, shape, and decoration is no accident: the proportions of the instrument are determined almost entirely by acoustical considerations. Its simplicity of appearance is deceptive. About 70 parts are involved in the construction of a violin. Its tone and its outstanding range of expressiveness make it an ideal solo instrument. No less important, however, is its role as an orchestral and chamber instrument. In combination with the larger and deeper- sounding members of the same family, the violins form the nucleus of the modern symphony orchestra. The violin has been in existence since about 1550. Its importance as an instrument in its own right dates from the early 1600s, when it fist became standard in Italian opera orchestras. Its stature as an orchestral instrument was raised further when in 1626 Louis XIII of France established at his court the orchestra known as Les vinq-quatre violons du Roy (The King's 24 Violins), which was to become widely famous later in the century. In its early history, the violin had a dull and rather quiet tone resulting from the fact that the strings were thick and were attached to the body of the instrument very loosely. During the eighteenth and nineteenth century, exciting technical changes were inspired by such composer-violinists as Vivaldi and Tartini. Their instrumental compositions demanded a fuller, clearer, and more brilliant tone that was produced by using thinner strings and a far higher string tension. Small changes had to be made to the violin's internal structure and to the figerboard so that they could withstand the extra strain. Accordingly, a higher standard of performance was achieved, in terms of both facility and interpretation. Left-hand technique was considerably elaborated, and new tigering patterns on the figerboard were developed for very high notes.
7. The word "Accordingly" inparagraph 4 is closest in meaning to: 

Read the following passage and then choose the best answer.
This is a picture of Tom’s family. He is my pen pal. He lives in a lovely old town in England. There are six people in his family: his parents, his aunt, his uncle, his brother and Tom. They live happily together.
Tom’s family lives in a nice house in the town. His house is near a park and next to a bookstore. There are seven rooms, a garage and a beautiful garden in the house. The seven rooms include three bedrooms, two bathrooms, one living room, and a large kitchen. Tom and his brother share a bedroom and they don’t really like it. The house was built in 1999 but it is still new and fashionable. The garden is so beautiful with many kinds of flowers. Tom loves the garden so much.
People in Tom’s family have different jobs. His father is fifty and he is a teacher. He teaches in a secondary school in the town. His mother is forty-eight and she is a housewife. She takes care of all the people in the house. She grows vegetables in the garden and usually prepares wonderful meals. His brother, Peter is a pilot. He flies a plane in the sky. He is very handsome. His aunt is a nurse. She helps doctors take care of sick people in the hospital. His uncle is a journalist. He writes articles for a local newspaper. Tom is a student and he wants to be a doctor in the future. I will go to England to see him again next summer vacation.

 What does Tom’s brother do?

Voluntary work is work that you do not get paid for and usually involves doing things to help other people, especially the elderly or the sick or working on (1)______ of a charity or similar organization. Most charitable organizations rely on unpaid volunteers, and thousands of Americans and British people give many hours of their time to doing some form of social work or organizing fund- raising events to support the work. Volunteering is especially popular in the US and the reasons this may be found in (2)______ American values such as the Protestant work ethic, the idea that work improves the person who does it, and the belief that people can change their condition if they try hard enough. In the US young people over 18 can take part in AmeriCorps, a government program that (3)______ them to work as volunteers for a period of time, with the promise of help in paying for their education later. Older Americans who do not work may spend much of their free time volunteering. In Britain a lot of voluntary work is directed towards supporting the country’s social services. The WRVS and other organizations run a meals on wheels service in many parts of Britain, provide hot meals for old people who are (4)______ to cook for themselves. The nationwide Citizens Advice Bureau, which offers free advice to the public on a wide range of issues, is run mainly by volunteers, and the Blood Transfusion Service relies on voluntary blood donors to give blood for use in hospitals. Political parties use volunteers at election time, and Churches depend on volunteers to (5) _______ building clean.

(46)_______

Read the following passage and choose the best answer (A, B, C, D):
Not everybody recognizes the benefits of new developments in communications technology. Indeed, some people fear that text messaging may actually be having a negative (1)_____ on young people's communication and language skills, especially when we hear that primary school children may be at (2)______ of becoming addicted to the habit. So widespread has texting become, however, that even pigeons have started doing it. What’s more, in this case, it's difficult to view the results as anything but positive. Twenty of the birds are about to (3) ______ to the skies with the task of measuring air pollution, each (4) _____ with sensor equipment and a mobile phone. The (5) _____ made by the sensors will be automatically (6) _____ into text messages and beamed to the Internet - where they will appear on a dedicated 'pigeon blog'

Choose the best answer:
The government has spent £1 million on an advertising ...... to encourage energy conservation.

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.
                      MODERN SCIENCE
It seems entirely natural to us that there are teams of scientists in universities and (1)............. institutions around the world, attempting to discover the way the world works. (2).............. , it hasn’t always been that way. Although the scientific method is now four or five hundred years old, the ancient Greeks, for example, believed that they could (3)............ the cause of natural events just by the power of thought. During the 17th century, more and more people began to realize that they could test their scientific ideas by designing a relevant experiment and seeing what happened. A lot of (4)......... was made in this way by individual scientists. These men and women often worked alone, carrying out research into many different areas of science, and they often received very little (5).............. for their hard work. At the start of the 20th century, though, it became clear that science was becoming more complicated and more expensive. The individual scientists disappeared, to be replaced by highly qualified teams of experts. Modern science was born.
(1).............................

Read the following passage and choose the best answer (A, B, C, D):
Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the number of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of the popular fad diets being offered. Many people see fad diets as innocuous ways of losing weight, and they are grateful to have them. Unfortunately, not only don't fad diets usually do the trick, they can actually be dangerous for your health. Although permanent weight loss is the goal, fewareabletoachieveit. Expertsestimate that 95 percent of dieters return to their starting weight, or even add weight. While the reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. Rather than being moderate, fad diets involve extreme dietary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation where a person's body doesn't get all the vitamins and other things that it needs to stay healthy. One popular fad diet recommends eating lots of meat and animal products, while nearly eliminating carbohydrates. A scientific study from Britain found that this diet is very high in fat. According to the study, the increase of damaging fats in the blood can lead to heart disease and, in extreme cases, kidney failure. Furthermore, diets that are too low in carbohydrates can cause the body to use its own muscle for energy. The less muscle you have, the less food you use up, and the result is slower weight loss. Veteran dieters may well ask at this point, "What is the ideal diet?" Well, to some extent, it depends on the individual. A United States government agency has determined that to change your eating habits requires changing your psychology of eating, and everyone has a different psychology. That being said, the British study quoted above recommends a diet that is high in carbohydrates and high in fiber, with portions of fatty foods kept low. According to the study, such a diet is the best for people who want to stay healthy, lose weight, and keep that weight off. And, any dieting program is best undertaken with a doctor's supervision.
3. After losing weight by dieting, what usually happens to people?

Choose the best answer:
The facsimile machine was created __________ Alexander Bain in 1843.

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 television has undoubtedly changed society. For a modern person to think about (1)__________ the world was like without television is actually hard to imagine. The world before the TV was one of little information flowing in to communities throughout the world. All information that people could get was filtered through newspapers often had specific biases that caused them to (2)__________ the news to whatever their preference was. Although television would follow this to a certain (3)__________, it was able to hit a widespread audience at the same time. In other words, people literally watched the broadcast at the same time each day, and they began (4)__________ news as things happened. A television grew into something that practically every household in industrialized nations had, businesspeople were quick to realize the (5)__________ television had. They realized there was an enormous amount of money to be made, and therefore they were willing to invest in the technology and infrastructure that made it possible.

Read the passage below carefully, and then choose the best answer:
The Most Powerful Force in Space
A black hole is a spot in space that has incredibly powerful gravity. A hole’s gravity is so strong that it pulls everything nearby into it. It can pull stars, planets, and other things. Nothing can escape a black hole. In fact, they are so powerful that even light cannot escape them. Scientists first started talking about black holes in the year 1783. That year, one scientist said that in the universe, there might be places with gravity strong enough to trap light. However, that scientist didn’t use the term “black hole”. The term “black hole” was invented in 1967. Black holes are formed when a star dies. When a star dies, it collapses. When that happens, a huge amount of matter crowds into a very small space. The matter becomes very, very dense. How much matter are we talking about? Imagine a star that is the size of ten suns. Imagine fitting that amount of matter into New York City. That is what a black hole is like. Its gravity is so powerful because it has so much matter. However, not all black holes are huge. Scientists believe that some black holes are the size of atoms. Although these black holes are tiny, they might have the same amount of matter that a mountain has. We can’t see black holes because they don’t have any light. They are completely invisible. Scientists can guess where black holes are by studying nearby stars and planets. If gravity seems to be pulling the stars and planets to one spot, then scientists believe that the spot is a black hole. Some people wonder if a black hole could ever destroy the Earth. We do not need to worry about that. There is no black hole that is close enough to destroy the Earth. The closest black hole is about 7,800 light years away. In addition, the sun is not big enough to create a black hole.
4. Which of the following CAN’T be inferred from the passage?

Read the following passage and choose the best answer (A, B, C, D):
Some technological developments are the results of years of diligent work. Others are stumbled upon by accident. The discovery of X-rays is in the second category. In 1895, X-ray radiation was accidentally discovered by a physicist named Wilhelm Rontgen, while he was working in his lab. Rontgen discovery greatly advanced medical science. One night in 1895, Wilhelm Rontgen was working with an electric device called a Crookes tube. A Crookes tube is a glass tube with metal components inside it. When turned on, the tube produces a stream of electrons. Rontgen and other scientists observed a new form of energy escaping from the front end of the Crookes tube. Rontgen wanted to be the first to discover this new mysterious energy. To do this, he needed to make sure the tube was covered with black cardboard. This would make the room completely dark and allow him to better see this new form of energy. Rontgen was hoping to observe this new energy on a special screen that would be placed right in front of the Crookes tube. Amazingly, before the screen was placed near the Crookes tube, Rontgen already noticed the screen was glowing. He bought the screen closer, and the glow became brighter. (1) He then placed a book between the end of the tube and the screen-the glow was still there. (2) Rontgen realized that a new and different form of radiation must be causing the screen to glow. (3) As he didn't know what kind of radiation it was, he named it "X". (4) Rontgen soon started studying the new type of radiation. He designed experiments which allowed him to test how far X- rays could penetrate. He also had the bright idea of trying to take photographs with X-rays. One day, he tested his theories by asking his wife to put her hand between a photographic plate and a Crookes Tube. Sure enough, the resulting image of the bones in his wife's hand was the first ever X-ray photograph of the human body. After taking that first photograph, Rontgen understood how X-rays could benefit doctors and patients. He shared his discovery, and soon X-ray machines were appearing in hospitals. X-rays were very useful for medicine because they let doctors see a patient's bones. If a patient had a broken bone, it was made visible by the X-ray image. This let doctors know the right way to repair the fracture. Wilhelm Rontgen's accidental discovery has now been helping people for over one hundred years. Thanks to X-rays, broken bones can be repaired reliably and effectively. We should be grateful to Wilhelm Rontgen for making his discovery freely available and greatly advancing medical science. Because of this, we humans are able to live longer, healthier lives.
6. In paragraph 1, what does "Others" refer to?

We often go for a walk ___ the weekends.

Choose the best answer:
How often _______ you _______ sports ? – Twice a week.

Find the word which has a different sound in the part underlined.

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 ‌from‌ ‌43‌ ‌to‌ ‌50.‌ ‌
There‌ ‌are‌ ‌two‌ ‌basic‌ ‌types‌ ‌of‌ ‌glaciers,‌ ‌those‌ ‌that‌ ‌flow‌ ‌outward‌ ‌in‌ ‌all‌ 
directions‌ ‌with‌ ‌little‌ ‌regard‌ ‌for‌ ‌any‌ ‌underlying‌ ‌‌terrain‌ ‌‌and‌ ‌those‌ ‌that‌ ‌are‌ ‌confined‌ ‌by‌ ‌terrain‌ ‌to‌ ‌a‌ ‌particular‌ ‌path.‌ ‌The‌ ‌first‌ ‌category‌ ‌of‌ ‌glaciers‌ ‌includes‌ ‌those‌ ‌massive‌ ‌blankets‌ ‌that‌ ‌cover‌ ‌whole‌ ‌continents,‌ ‌appropriately‌ ‌called‌ ‌ice‌ ‌sheets.‌ ‌There‌ ‌must‌ ‌be‌ ‌over‌ ‌50,000‌ ‌square‌ ‌kilometers‌ ‌of‌ ‌land‌ ‌covered‌ ‌with‌ ‌ice‌ ‌for‌ ‌the‌ ‌glacier‌ ‌to‌ ‌
qualify‌ ‌as‌ ‌an‌ ‌ice‌ ‌sheet,‌ ‌when‌ ‌portions‌ ‌of‌ ‌an‌ ‌ice‌ ‌sheet‌ ‌spread‌ ‌out‌ ‌over‌ ‌the‌ ‌ocean,‌ ‌they‌ ‌form‌ ‌ice‌ ‌shelves.‌ ‌
About‌ ‌20,000‌ ‌years‌ ‌ago‌ ‌the‌ ‌Cordilleran‌ ‌Ice‌ ‌sheet‌ ‌covered‌ ‌nearly‌ ‌all‌ ‌the‌ ‌mountains‌ ‌in‌ ‌southern‌ ‌Alaska,‌ ‌western‌ ‌Canada,‌ ‌and‌ ‌the‌ ‌western‌ ‌United‌ ‌States.‌ ‌It‌ ‌was‌ ‌about‌ ‌3‌ ‌kilometers‌ ‌deep‌ ‌at‌ ‌its‌ ‌thickest‌ ‌point‌ ‌in‌ ‌
northern‌ ‌Alberta.‌ ‌Now‌ ‌there‌ ‌are‌ ‌only‌ ‌two‌ ‌sheets‌ ‌left‌ ‌on‌ ‌Earth,‌ ‌those‌ ‌covering‌ ‌Greenland‌ ‌and‌ ‌Antarctica.‌ ‌Any‌ ‌domelike‌ ‌body‌ ‌of‌ ‌ice‌ ‌that‌ ‌also‌ ‌flows‌ ‌out‌ ‌in‌ ‌all‌ ‌directions‌ ‌but‌ ‌covers‌ ‌less‌ ‌than‌ ‌50,000‌ ‌square‌ ‌kilometers‌ ‌is‌ ‌called‌ ‌an‌ ‌ice‌ ‌cap.‌ ‌Although‌ ‌ice‌ ‌caps‌ ‌are‌ ‌rare‌ ‌nowadays,‌ ‌there‌ ‌are‌ ‌a‌ ‌number‌ ‌in‌ ‌northeastern‌ ‌Canada,‌ ‌on‌ ‌
Baffin‌ ‌Island,‌ ‌and‌ ‌on‌ ‌the‌ ‌Queen‌ ‌Elizabeth‌ ‌Islands.‌ ‌The‌ ‌second‌ ‌category‌ ‌of‌ ‌glaciers‌ ‌includes‌ ‌those‌ ‌of‌ ‌a‌ ‌variety‌ ‌of‌ ‌shapes‌ ‌and‌ ‌sizes‌ ‌generally‌ ‌called‌ ‌mountain‌ ‌or‌ ‌alpine‌ ‌glaciers.‌ ‌Mountain‌ ‌glaciers‌ ‌are‌ ‌typically‌ ‌identified‌ ‌by‌ ‌the‌ ‌landform‌ ‌that‌ ‌controls‌ ‌their‌ ‌flow.‌ ‌One‌ ‌form‌ ‌of‌ ‌mountain‌ ‌glacier‌ ‌that‌ ‌resembles‌ ‌an‌ ‌ice‌ ‌cap‌ ‌in‌ ‌that‌ ‌it‌ ‌flows‌ ‌outward‌ ‌in‌ ‌several‌ ‌directions‌ ‌is‌ ‌called‌ ‌an‌ ‌ice‌ ‌field.‌ ‌The‌ ‌difference‌ ‌between‌ ‌an‌ ‌ice‌ ‌field‌ ‌and‌ ‌an‌ ‌ice‌ ‌cap‌ ‌is‌ ‌‌subtle‌.‌ ‌Essentially,‌ ‌the‌ ‌flow‌ ‌of‌ ‌an‌ ‌ice‌ ‌field‌ ‌is‌ ‌somewhat‌ ‌controlled‌ ‌by‌ ‌surrounding‌ ‌terrain‌ ‌and‌ ‌thus‌ ‌does‌ ‌not‌ ‌have‌ ‌the‌ ‌domelike‌ ‌shape‌ ‌of‌ ‌a‌ ‌cap.‌ ‌
There‌ ‌are‌ ‌several‌ ‌ice‌ ‌fields‌ ‌in‌ ‌the‌ ‌Wrangell.‌ ‌St.‌ ‌Elias,‌ ‌and‌ ‌Chugach‌ ‌mountains‌ ‌of‌ ‌Alaska‌ ‌and‌ ‌northern‌ ‌British‌ ‌Columbia.‌ ‌Less‌ ‌spectacular‌ ‌than‌ ‌large‌ ‌ice‌ ‌fields‌ ‌are‌ ‌the‌ ‌most‌ ‌common‌ ‌types‌ ‌of‌ ‌mountain‌ ‌glaciers:‌ ‌the‌ ‌cirque‌ ‌and‌ ‌valley‌ ‌glaciers.‌ ‌Cirque‌ ‌glaciers‌ ‌are‌ ‌found‌ ‌in‌ ‌depressions‌ ‌in‌ ‌the‌ ‌surface‌ ‌of‌ ‌the‌ ‌land‌ ‌and‌ ‌have‌ ‌a‌ ‌characteristic‌ ‌circular‌ ‌shape.‌ ‌The‌ ‌ice‌ ‌of‌ ‌valley‌ ‌glaciers,‌ ‌bound‌ ‌by‌ ‌terrain,‌ ‌flows‌ ‌down‌ ‌valleys,‌ ‌curves‌ ‌around‌ ‌‌their‌ ‌‌corners,‌ ‌
and‌ ‌falls‌ ‌over‌ ‌cliffs.‌ ‌

According‌ ‌to‌ ‌the‌ ‌passage,‌ ‌where‌ ‌was‌ ‌the‌ ‌Cordilleran‌ ‌Ice‌ ‌Sheet‌ ‌thickest?‌ ‌