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

     PARENTS’ DREAMS

     Parents often have dreams for their children’s future. They hope their children will have a better life than they had. They dream that their children will do things that they couldn’t do.

Parents who come to the U.S from foreign countries hope their children will have better education here. They think their children will have more career choices and more successful lives. They make many sacrifices so that their children will have more opportunities. They think their children will remain close to them because of this. Some children understand and appreciate these sacrifices and remain close to their parents. However, other children feel ashamed that their parents are so different from other Americans.

Parents think their children will remain close to them because___

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.

   Technology has utterly transformed our ability to communicate with each other. Linking to each other both literally and figuratively, many of us connect through cell phones, email, instant messaging, blogs, and networking web sites, yet we may be less connected to each other than we think.

   According to a study, Americans are becoming increasingly socially isolated. The study reveals, for example, that one quarter of Americans say that they have no one to discuss important personal issues with, and that the number of close friends that American have has dropped from three to two. Meanwhile, the Boston Globe reports that this spreading isolation is experienced more sharply among those with less education, people of color, and older Americans. Unsurprisingly, those who are young, white, and well educated tend to have stronger social networks.

   From my own experience I have to say that I’ve never felt more connected, thanks to a web of friends, family, and colleagues. One of my closest friends is someone I met through an online discussion group who lives hundreds of miles away from me. We have met face-to-face only twice, yet our regular electronic correspondence and cell phone calls sustain our close friendship. And, speaking of blogging, my blog has introduced me to people I would never have met otherwise and has led to enduring and important friendships.

   On the other hand, I recently saw a scene unfold that proved to me how deeply disconnected we as Americans have become. I had just wrapped up a presentation on mediation at a family therapy center. As I was leaving, I noticed a mother and her teenage son who had just completed their session with their family therapist. After making their next appointment, they both took out their cell phones, placed calls, and began loud conversations with whoever was on the other end. I walked out behind them to the parking lot to my car. They both jumped into their SUV, and, as I saw them drive off, they were still talking on their cell phones. But, alas, not to each other.

The writer himself __________ .

Identify the one underlined word or phrase - A, B, C or D - that must be changed for the sentence to be correct.

 During a curfew it is not possible walking on the streets after a specified hour.

Read the following passage and choose the best answer (A, B, C, D):
A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purifiation scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In this localized regions, human output may be dominant and may temporarily overload the natural purifiation scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities.The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells US little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.
7: The word "noxious" in line 19 in the passage is closest in meaning to: 

Read the passage carefully, then choose the correct answers.

Having a best friend to confide in can bring a positive effect on our emotional health. An evening out with the closest friend may be the best guarantee of a good time. In fact, our best friend can prevent us from developing serious psychological problems such as depression and anxiety.

Best friendship evolves with time - we cannot go out and pick our best friend. We become friends with people who share common interests – at school or through hobbies, for example.

Best friends have usually known each other for years and stuck together through good and bad times. If you haven't got one, perhaps you are being too distant from people, or focusing too much on your work.

 The word 'one' in the last paragraph refers to ________.

Read the passage carefully, then choose the correct answers.

Having a best friend to confide in can bring a positive effect on our emotional health. An evening out with the closest friend may be the best guarantee of a good time. In fact, our best friend can prevent us from developing serious psychological problems such as depression and anxiety.

Best friendship evolves with time - we cannot go out and pick our best friend. We become friends with people who share common interests – at school or through hobbies, for example.

Best friends have usually known each other for years and stuck together through good and bad times. If you haven't got one, perhaps you are being too distant from people, or focusing too much on your work.

Close friends need to ________.

Read the following passage and choose the best answer (A, B, C, D):
At first glance, there is little in Horton to attract people. The other nearby towns have much more to offer: Bradfield has its river and historic buildings, while Newtown has shops and entertainment. The buildings of Horton look dirty and unloved. For shops, there is a small supermarket, a few bargain shops, a bakery which, strangely, does not sell bread and a florist which has one stand of sad-looking flowers. Even so, Horton has several advantages over its neighbouring towns. Firstly, it has a country park. Four thousand years ago, this was an important fort. There are no historic remains here now, but there are wonderful views over the countryside. On sunny weekends you can often see kids out with their parents, kicking balls or flying kites. There aren’t many job opportunities in Horton, and the roads to nearby cities aren’t really fast, but there are excellent rail links. You can be in London in an hour and a half, and other cities are less than an hour away. That means that parents can earn a good salary and still get home in time to spend the evenings with their families. Houses in Horton aren’t pretty, but they are functional and cheap. The streets are  quiet and safe, and there are plenty of parks and playgrounds. It has a library, three primary schools and a secondary school, St. Mark’s. It’s not as academically brilliant as other schools in the area, but it is friendly and offers a wide range of subjects and activities to children of all abilities and backgrounds. The town also has a swimming and a sports centre, and the community halls hold regular clubs and events for people of all ages.
3. What part of Horton does the writer find disappointing?

Read the text and choose the best option to fill in each blank numbered:
Keeping your distance
Personal space is a term that refers (1)_______  the distance we like to keep between ourselves and other people. When (2) _______ we do not know well gets too close we usually begin to feel uncomfortable. If a business colleague comes closer than 1.2 meters, the most common response is to move (3)______ Some interesting (4)______ have been done in libraries. If strangers come too close, many people get up and leave the building; others use different methods such as turning their back on the intruder. Living in cities has made people develop new skills for dealing with situations where they are very close to strangers. Most people on crowded trains try not to look at strangers; they avoid skin contact, and apologize if hands touch by mistake. People use newspapers (5)_______ a barrier between themselves and other people, and if they do not have one, they stare into the distance, making sure they are not looking into anyone’s eyes.

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.

   Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will fertilize hundreds of thousands, and in some cases millions, of seeds, so microscopic and light they are easily carried by the breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator.

   To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds. Some orchids even change their scents to interest different insects at different times.

   Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed. By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.

The orchid is unique because of.....................

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

My name’s Mandi. Three months ago, I went to disco where I met a boy called Tom. I guessed he was older than me, but I liked him and thought it didn’t matter. We danced a couple of times, then we chatted. He said he was 18, then asked how old I was. I told him I was 16. I thought that if I told him my real age, he wouldn’t want to know me, as I’m only 13.

After the dicso we arranged to meet the following weekend. The next Saturday we went for a burger and had a real laugh. Afterwards he walked me to my street and kissed me goodnight. Things went really well. We see each other a couple of times a week, but I’ve had to lie to my parents about where I’m going and who with. I’ve always got on with them, but I know if they found out how Tom was they’d stop me seeing him.

Now I really don’t know what to do. I can’t go on lying to my parents every time I go out, and Ton keeps asking he can’t come around to my house. I’m really worried and I need some advice.

Why can’t Tom come to Mandi’s house? 

Read the following passage and choose the best answer (A, B, C, D):
Music can bring US to tears or to our feet, drive US into battle or lull US to sleep. Music is indeed remarkable in its power over all humankind, and perhaps for that every reason, no human culture on earth has ever lived without it. From discoveries made in France and Slovenia even Neanderthal man, as long as 53,000 years ago, had developed surprisingly sophisticated, sweet-sounding flutes carved from animal bones. It is perhaps then, no accident that music should strike such a chord with the limbic system - an ancient part of our brain, evolutionarily speaking, and one that we share with much of the animal kingdom. Some researchers even propose that music came into this world long before the human race ever did. For  example, the fact that whale and human music have so much in common even though our evolutionary paths have not interested for nearly 60 million years suggests that music may predate humans. They assert that rather than being the inventors of music, we are latecomers to the musical scene. Humpback whale composers employ many of the same tricks that human songwriters do. In addition to using similar rhythms, humpbacks keep musical phrases to a few seconds, creating themes out of several phrases before singing the next one. Whale songs in general are no longer than symphony movements, perhaps because they have a similar attention span. Even though they can sing over a range of seven octaves, the whales typically sing in key, spreading adjacent notes no farther apart than a scale. They mix percussive and pure tones in pretty much the same ratios as human composers - and follow their ABA form, in which a theme is presented, elaborated on and then revisited in a slightly modified form. Perhaps most amazingly, humpback whale songs include repeating refrains that rhyme. It has been suggested that whales might use rhymes for exactly the same reasons that we do: as devices to help them remember. Whale songs can also be rather catchy. When a few humpbacks from the Indian Ocean strayed into the Pacific, some of the whales they met there quickly changed their tunes - singing the new whales'songs within three short years. Some scientists are even tempted to speculate that a universal music awaits discovery.
4: According to the passage, which of the following is true of humpback whales?

Read the following passage and choose the correct answer to each of the questions.

Welcome to Get Involved! our weekly programme about inspirational young people. Today, I’ll tell you the amazing story of an outstanding young person with a disability. Nguyen Anh was born with “glass-born disease”, a genetic disorder causing fragile bones, and had fractured bones over 30 times. She is unable to run around like her friends, and has to use a wheelchair. Despite her disability, she always has a smile on her face. She believes that she is luckier than other people with disabilities because she has many supportive friends and teachers.

Nguyen Anh has been interested in singing since an early age. Eager to join Charitable campaigns, she has been using her talent to perform at Voice of Viet Nam since she was eight. She has taken part in broadcasting radio messages to rural villagers. She has been honoured by UNICEF as an outstanding child with disabilities. Now, as a Friend of UNICEF Viet Nam, she continues to inspire others, and use her talent and determination to help children with disabilities.

She became a success when she auditioned for the television show VietNam’s Got Talent. She immediately received national and international recognition.

Her smile and kind voice will definitely continue to encourage people with disabilities to fulfill their potential. Her inspiring words are what we would like you to think about. "You can do a lot of things if people believe in you and actually treat you equally.”  

Due to____, UNICEF has honoured Nguyen Anh as an outstanding child with disabilities.  

Read the passage and choose the best option to fill in each blank.

An important part of being an adult is becoming more independent from your parents. _____(24)_____ independent, you'll need to focus on your living situation, your financial resources, your budgeting behavior and possibly how you interact with your parents in your day-to-day life.

Make sure you are living somewhere other than your parents' house or in a residence that your parents have paid ____(25)____. If you want to be independent and make your own decisions about how you live, you will need to obtain your own housing that is completely separate from your parents both physically and financially.

One of the main challenges in becoming independent as an adult is acquiring a sufficient income to allow you to live without the financial ____(26)____of your parents. This can be particularly difficult if you are still a university student, but it is not impossible. Seek scholarships and part-time jobs. If you are ___(27)____ a student, find employment that offers a salary that can cover your expenses. Avoid relying on your parents as the first option for help of any kind. Although your parents will always be an important source of social support in your life, your parents should not be the first people you approach with requests for help, or requests for financial assistance. This means that you may never ask your parents for help again, it just means that as an independent adult, there should be ___(28)____ sources of support within your life that you can turn to when necessary.

Question 27..................

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.

   It is commonly believed in the United States that school is where people go to get an education. Nevertheless, it has been said that today children interrupt their education to go to school. The distinction between schooling and education implied by this remark is important.

   Education is much more open-ended and all-inclusive than schooling. Education knows no bounds. It can take place anywhere, whether in the shower or on the job, whether in a kitchen or on a tractor. It includes both the formal learning that takes place in schools and the whole universe of informal learning. The agents of education can range from a revered grandparent to the people debating politics on the radio, from a child to a distinguished scientist. Whereas schooling has a certain predictability, education quite often produces surprises. A chance conversation with a stranger may lead a person to discover how little is known of other religions. People are engaged in education from infancy on. Education, then, is a very broad, inclusive term. It is a lifelong process, a process that starts long before the start of school, and one that should be an integral part of one's entire life.

   Schooling, on the other hand, is a specific, formalized process, whose general pattern varies little from one setting to the next. Throughout a country, children arrive at school at approximately the same time, take assigned seats, are taught by an adult, use similar textbooks, do homework, take exams, and so on. The slices of reality that are to be learned, whether they are the alphabet or an understanding of the workings of government, have usually been limited by the boundaries of the subject being taught. For example, high school students know that they are not likely to find out in their classes the truth about political problems in their communities or what the newest filmmakers are experimenting with. There are definite conditions surrounding the formalized process of schooling.

The phrase “For example,” line 19, introduces a sentence that gives examples of....................

Read the following passage and choose the best answer (A, B, C, D):
Music can bring US to tears or to our feet, drive US into battle or lull US to sleep. Music is indeed remarkable in its power over all humankind, and perhaps for that every reason, no human culture on earth has ever lived without it. From discoveries made in France and Slovenia even Neanderthal man, as long as 53,000 years ago, had developed surprisingly sophisticated, sweet-sounding flutes carved from animal bones. It is perhaps then, no accident that music should strike such a chord with the limbic system - an ancient part of our brain, evolutionarily speaking, and one that we share with much of the animal kingdom. Some researchers even propose that music came into this world long before the human race ever did. For  example, the fact that whale and human music have so much in common even though our evolutionary paths have not interested for nearly 60 million years suggests that music may predate humans. They assert that rather than being the inventors of music, we are latecomers to the musical scene. Humpback whale composers employ many of the same tricks that human songwriters do. In addition to using similar rhythms, humpbacks keep musical phrases to a few seconds, creating themes out of several phrases before singing the next one. Whale songs in general are no longer than symphony movements, perhaps because they have a similar attention span. Even though they can sing over a range of seven octaves, the whales typically sing in key, spreading adjacent notes no farther apart than a scale. They mix percussive and pure tones in pretty much the same ratios as human composers - and follow their ABA form, in which a theme is presented, elaborated on and then revisited in a slightly modified form. Perhaps most amazingly, humpback whale songs include repeating refrains that rhyme. It has been suggested that whales might use rhymes for exactly the same reasons that we do: as devices to help them remember. Whale songs can also be rather catchy. When a few humpbacks from the Indian Ocean strayed into the Pacific, some of the whales they met there quickly changed their tunes - singing the new whales'songs within three short years. Some scientists are even tempted to speculate that a universal music awaits discovery.
5: The word "They" in paragraph 2 refers to: 

The ideas of John Dewey, philosopher and educator, have influenced American thought for over one hundred years. Dewey was born in Vermont in 1859, and throughout hi life he kept the respect for experience, individuality, and fair play that shaped the character of the nineteenth century Vermonter. He viewed his own life as a continuously reconstructive process with experience and knowledge building on each other. By the 1930s, Dewey had simplified his theory of experience to its essence. As the intellectual leader of the progressive schools, he asserted that there was danger in rejecting the old unless the new was rooted in a connect idea of experience. He held that experience is an interaction between what a person already knows and the situation at hand. Previous knowledge interacting with the present environment influences future experience. Dewey be1ieved that experience could not be equated with education because all experiences as not necessarily educative. Experience is educative only when it contributes to the growth of the individual, but it can be miseducative if it distorts the growth of further experience. It is the quality of experience that matters. Thus, productive experience is both the means and the goal of education. Furthermore, since education is a social process, truly progressive education involves the participation of the learner in directing the learning experience.During his long life, Dewey lectured and published prolifically. These writings were influential both during his lifetime and after his death at the age of ninety-two. He viewed his whole life as an experiment which would produce knowledge that would lead to further experimentation. The range and diversity of Dewey’s writings and his influence on society place him among American’s great thinkers.

According to John Dewey, the interplay between a person’s previous knowledge and the present situation is_____.

Read the following passage and choose the best answer (A, B, C, D):
The United Nations is an international organization founded in 1945. It is currently made up of 193 member countries. Its main goal is to bring different nations together to promote peace and justice in the world. The UN also works to make the world a safe and secure place. It is important to remember that the UN is not a “world government”. This means that the UN does not make laws for different countries to follow. However, the UN does hold regular votes on global policies and issues. The main branch of the UN is called the “General Assembly”. All members of the United Nations are represented and have their votes. If there is a problem in a certain area of the world or a particular country, the UN will vote on how to best solve the problem. At least two-thirds of all member countries must agree on how to resolve the problem in order for the UN to take action. If less than two-thirds of the voting countries agree, no immediate action is taken. Another branch is the Security Council. Its main purpose is to maintain international peace and keep the world secure. This branch has only fifteen members, five of which are permanent, including China, France, Russia, the United Kingdom, and the United States. The other ten members are elected by the General Assembly for two-year terms. IF the council feels that international peace is being threatened, the fifteen members will try to outline a way to resolve the situation in a peaceful manner. The third important branch is the Economic and Social Council. This branch works to help monitor the world economy and resolve social issues around the world such as violations of human rights, the fight against international crime and destruction of the environment. There are 54 government representatives serving on this council. They are elected by the General Assembly to serve for three-year terms. Council members are elected to represent certain areas of the world. 
2. The word “maintain” in paragraph 4 is closest in meaning to: 

Read the following passage and choose the best answer (A, B, C, D):
The United Nations is an international organization founded in 1945. It is currently made up of 193 member countries. Its main goal is to bring different nations together to promote peace and justice in the world. The UN also works to make the world a safe and secure place. It is important to remember that the UN is not a “world government”. This means that the UN does not make laws for different countries to follow. However, the UN does hold regular votes on global policies and issues. The main branch of the UN is called the “General Assembly”. All members of the United Nations are represented and have their votes. If there is a problem in a certain area of the world or a particular country, the UN will vote on how to best solve the problem. At least two-thirds of all member countries must agree on how to resolve the problem in order for the UN to take action. If less than two-thirds of the voting countries agree, no immediate action is taken. Another branch is the Security Council. Its main purpose is to maintain international peace and keep the world secure. This branch has only fifteen members, five of which are permanent, including China, France, Russia, the United Kingdom, and the United States. The other ten members are elected by the General Assembly for two-year terms. IF the council feels that international peace is being threatened, the fifteen members will try to outline a way to resolve the situation in a peaceful manner. The third important branch is the Economic and Social Council. This branch works to help monitor the world economy and resolve social issues around the world such as violations of human rights, the fight against international crime and destruction of the environment. There are 54 government representatives serving on this council. They are elected by the General Assembly to serve for three-year terms. Council members are elected to represent certain areas of the world. 
7. It can be inferred from the passage that: 

Read the following passage and choose the best answer (A, B, C, D):
Continents and ocean basins represent the largest identifiable bodies on Earth. On the solid portion of the planet, the second most prominent features are flat plains, elevated plateaus, and large mountain ranges. In geography, the term "continent" refers to the surface of continuous landmasses that together comprise about 29.2% of the planet's surface. On the other hand, another definition is prevalent in the general use of the term that deals with extensive mainlands, such as Europe or Asia,that actually represent one very large landmass. Although all continents are bounded by the water bodies or high mountain ranges, isolated mainlands, such as Greenland and India-Pakistan areas are called subcontinents. In some circles, the distinction between continents and large islands lies almost exclusively in the size of a particular landmass. The analysis of compression and tension in the earth's crust has determined that continental structures are composed of layers that underlie continental shelves. A great deal of disagreement among geologists surrounds the issue of exactly how many layers underlie each landmass because of their distincive mineral and chemical composition. It's also quite possible that the ocean floor rests on top of unknown continents that have not yet been explored. The continental crust is believed to have been forrmed by means of a chemical reaction when lighter materials separated from heavier ones,thus settling at various levels within the crust. Assisted by the measurements of the specifics within crust formations by means of monitoring earthquakes, geologists can speculate that a chemical split occured to form the atmosphere, sea water and the crust before it solidified many centuries ago. Although each continent has its special features, all consist of various combinations of components that include shields,moutain belts, intracratonic basins, margins, volcanic plateaus, and blockvaulted belts. The basic differences among continents lie in the proportion and the composition of these features relative to the continent size. Climatic zones have a crucial effect on the weathering and formation of the surface features, soil erosion, soil deposition, land formation, vegetation, and human activities. Moutian belts are elongated narrow zones that have a characteristic folded sedimentary organization of layers. They are typically produced during substabtial crustal movements, which generate faulting and moutain building. When continental margins collide, the rise of a marginal edge leads to the formation of large moutain ranges, as explained by the plate tectonic theory. This process also accounts for the occurrence of mountain belts in ocean basins and produces evidence for the ongoing continental plate
evolution.
11. The word "evidence" in the last line is closest in meaning to: 

Read the following passage and choose the best answer (A, B, C, D):
You can usually tell when your friends are happy or angry by the looks on their faces or by their actions. This is useful because reading their emotional expressions helps you to know how to respond to them. Emotions have evolved to help us respond to important situations and to convey our intentions to others. But does raising the eyebrows and rounding the mouth say the same thing in Minneapolis as it does in Madagascar ? Much research on emotional expressions has centered on such questions. According to Paul Ekman, the leading researcher in this area, people speak and understand substantially the same “facial language”. Studies by Ekman’s group have demonstrated that humans share a set of universal emotional expressions that testify to the common biological heritage of the human species. Smiles, for example, signal happiness and frowns indicate sadness on the faces of people in such far-flung places as Argentina, Japan, Spain, Hungary, Poland, Sumatra, the United States, Vietnam, the jungles of New Guinea, and the Eskimo villages north of Artic Circle. Ekman and his colleagues claim that people everywhere can recognize at least seven basic emotions: sadness, fear, anger, disgust, contempt, happiness, and surprise. There are, however, huge differences across cultures in both the context and intensity of emotional displays – the so-called display responses – expecially negative ones – while many American children are encouraged to express their feelings more openly. Regardless of culture, however, emotions usually show themselves, to some degree, in people’s behavior. From their first days in life, babies produce facial expressions that communicate their feelings. The ability to read facial expressions develops early, too. Very young children pay close attention to facial expressions, and by age five, they nearly equal adults in their skill at reading emotions on people’s faces. This evidence all points to a biological underpinning for our abilities to express and interpret a basic set of human emotions. Moreover, as Chales Dawin pointed out over a century ago, some emotional expressions seem to appear across species boundaries. Cross-cultural psychologists tell us that certain emotional responses carry different meanings in diferrent cultures. For example, what emotion do you suppose might be conveyed while sticking out your tounge ? For American, this might indicate disgust, while in China it can signify surprise. Likewise, a grin on an American face may indicate joy, while on a Japanese face it may just as easily mean embarrassment. Clearly, culture influences emotional expressions.
6: The biggest difference lies in .

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.

   A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world’s largest and deepest, lies hidden there under four kilometers of ice. Now known as Lake Vostok, this huge body of water is located under the ice block that comprises Antarctica. The lake is able to exist in its unfrozen state beneath this block of ice because its waters are warned by geothermal heat from the earth’s core. This thick glacier above Lake Vostok actually insulates it from frigid temperatures (the lowest ever recorded on Earth) on the surface.

   The lake was first discovered in the 1970s while a research team was conducting an aerial survey of the area. Radio waves from the survey equipment penetrated the ice and revealed a body of water of indeterminate size. It was not until much more recently that data collected by satellite made scientists aware of the tremendous size of the lake; satellite-borne radar detected an extremely flat region where the ice remains level because it is floating on the water of the lake.

   The discovery of such a huge fresh water lake trapped under Antarctica is of interest to the scientific community because of the potential that the lake contains ancient microbes that have survived for thousands upon thousands of years, unaffected by factors such as nuclear fallout and elevated ultraviolet light that have conducting research on the lake in such a harsh climate and in the problems associated with obtaining uncontaminated sampled from the lake without actually exposing the lake to contamination. Scientists are looking for possible ways to accomplish this.

Which of the following is closest in meaning to “frigid” in the first paragraph?