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Cold storage, or refrigeration, is keeping food at temperatures between 32 and 45 degrees F in order to delay the growth of microorganisms - bacteria, molds, and yeast - that cause food to spoil. Refrigeration produces few changes in food, so meats, fish, eggs, milk, fruits, and vegetables keep their original flavor, color, and nutrition. Before artificial refrigeration was invented, people stored perishable food with ice or snow to lengthen its storage time. Preserving food by keeping it in an ice-filled pit is a 4,000-year-old art. Cold storage areas were built in basements, cellars, or caves, lined with wood or straw, and packed with ice. The ice was transported from mountains, or harvested from local lakes or rivers, and delivered in large blocks to homes and businesses.
Artificial refrigeration is the process of removing heat from a substance, container, or enclosed area, to lower its temperature. The heat is moved from the inside of the container to the outside. A refrigerator uses the evaporation of a volatile liquid, or refrigerant, to absorb heat. In most types of refrigerators, the refrigerant is compressed, pumped through a pipe, and allowed to vaporize. As the liquid turns to vapor, it loses heat and gets colder because the molecules of vapor use energy to leave the liquid. The molecules left behind have less energy and so the liquid becomes colder. Thus, the air inside the refrigerator is chilled.
Scientists and inventors from around the world developed artificial refrigeration during the eighteenth and nineteenth centuries. William Cullen demonstrated artificial refrigeration in Scotland in 1748, when he let ethyl ether boil into a partial vacuum. In 1805, American inventor Oliver Evans designed the first refrigeration machine that used vapor instead of liquid. In 1842, physician John Gorrie used Evans's design to create an air-cooling apparatus to treat yellow-fever patients in a Florida hospital. Gorrie later left his medical practice and experimented with ice making, and in 1851 he was granted the first U.S. patent for mechanical refrigeration. In the same year, an Australian printer, James Harrison, built an ether refrigerator after noticing that when he cleaned his type with ether it became very cold as the ether evaporated. Five years later, Harrison introduced vapor-compression refrigeration to the brewing and meatpacking industries.
Brewing was the first industry in the United States to use mechanical refrigeration extensively, and in the 1870s, commercial refrigeration was primarily directed at breweries. German-born Adolphus Busch was the first to use artificial refrigeration at his brewery in St. Louis. Before refrigeration, brewers stored their beer in caves, and production was constrained by the amount of available cave space. Brewing was strictly a local business since beer was highly perishable and shipping it any distance would result in spoilage. Busch solved the storage problem with the commercial vapor- compression refrigerator. He solved the shipping problem with the newly invented refrigerated railcar, which was insulated with ice bunkers in each end. Air came in on the top, passed through the bunkers, and circulated through the car by gravity. In solving Busch's spoilage and storage problems, refrigeration also revolutionized an entire industry. By 1891, nearly every brewery was equipped with mechanical refrigerating machines.
The refrigerators of today rely on the same basic principle of cooling caused by the rapid evaporation and expansion of gases. Until 1929, refrigerators used toxic gases - ammonia, methyl chloride, and sulfur dioxide - as refrigerants. After those gases accidentally killed several people, chlorofluorocarbons (CFCs) became the standard refrigerant. However, they were found to be harmful to the earth's

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:
Most people can remember a phone number for up to trirty seconds. When this short amount of time elapses, however, the numbers are eerased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows atimuli that is of immediate interest to pass on to the STM, also known as the working memory.
There is much debate about the capacity an duration of the short term memory. The most accepted theory comes from George A.Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or nam rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.
When making a conscious effort to memorize something, such as information for an exam, many people engage in “rote rehearsal”. By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice “elaborate rehearsal”. This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.
Encoding information semantically also makes it more retrievable. Retrieving information can be done by rocognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choise tests are often used for subjects that require a lot of memorization.

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

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Staying in a hotel costs ______ renting a room in a dormitory for a week.

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Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.

According to the passage, students working for their first degree at   ..........  are called undergraduates.

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She is ..................... more hard-working than her sister.

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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?

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The atmosphere is getting more …………… because there is more smoke from factories and motor engines.

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:
Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.

Which of the following is NOT mentioned in the passage as full-time university students?

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 human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building.
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina. And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae - areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time.
A frog’s vision is distinguished by its ability to perceive things as a constant motion picture. Known as “bug detectors”, a highly developed set of cells in a frog’s eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn’t see them as food and would starve. The bee has a “compound” eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee’s eye also gauges flight speed. And if that is not enough to leave our 20/20 “perfect vision” paling into insignificance, the bee is capable of seeing something we can’t - ultraviolet light.
Thus, what humans consider to be “perfect vision” is in fact rather limited when we look at other species. However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.

What does the passage mainly discuss?

With its long days, lack of _____ atmosphere, and wide-open spaces, _____ moon would also make an ideal place to put massive solar power plants.

(326)_____

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 :
For athletes who like to (1) _________ a variety of endurance sports in a single race, triathlons are a great fit. These competitions (2) _________ running, cycling, and swimming into one race, and they take place one after the other in a single continuous timed race. Athletes who participate must be in top physical form and have the skills needed to complete each portion of the race. Training for triathlons means the athletes have to become proficient not only in the sport required in each stage, but they also have to become familiar with what (3) _________ from one to the other does to their bodies. Many inexperienced triathletes are surprised to (4) _________ hard it can be to switch from swimming to cycling to running, and how tired their muscles can suddenly feel. One thing all triathletes can agree (5) _________ is that no one ever told them that running a triathlon would be easy

Read the following passage and choose the best answer (A, B, C, D):
One of the most important social developments that helped to make possible a shift in thinking about the role of public education was the effect of the baby boom of the 1950’s and 1960’s on the schools. In the 1920’s, but especially in the Depression conditions of the 1930’s, the United States experienced a declining birth rate – every thousand women aged fifteen to forty-four gave birth to about 118 live children in 1920, 89.2 in 1930, 75.8 in 1936, and 80 in 1940. With the growing prosperity brought on by the Second World War and the economic boom that followed it, young people married and established households earlier and began to raise larger families than had their predecessors during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. Although economics was probably the most important determinant, it is not the only explanation for the baby boom. The increased value placed on the idea of the family also helps to explain this rise in birth rates. The baby boomers began streaming into the first grade by the mid-1940’s and became a flood by 1950. The public school system suddenly found itself overtaxed. While the number of schoolchildren rose because of wartime and postwar conditions, these same conditions made the schools even less prepared to cope with the flood. The wartime economy meant that few new schools were built between 1940 and 1945. Moreover, during the war and in the boom times that followed large numbers of teachers left their profession for better-paying jobs elsewhere in the economy. Therefore, in the 1950’s and 1960’s, the baby boom hit an antiquated and inadequate school system. Consequently, the “custodial rhetoric” of the 1930’s and early 1940’s no longer made sense; that is, keeping youths aged sixteen and older out of the labor market by keeping them in school could no longer be a high priority for an institution unable to find space and staff to teach younger children aged five to sixteen. With the baby boom, the focus of educators and of laymen interested in education inevitably turned toward the lower grades and back to basic academic skills and discipline. The system no longer had much interest in offering nontraditional, new, and extra services to older youths
6. The word “inevitably” in parapraph 2 is closest in meaning to _________

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The position of sport in today’s society has changed out of all recognition. People no longer seem to think of sports as ‘just a game’ – to be watched or played for the (1) _________ of enjoyment. Instead, it has become big business worldwide. It has become accepted practice for leading companies to provide sponsorship. TV companies pay large sums of money to screen important matches or competitions. The result has been huge rewards for athletes, some of (2) _________ are now very wealthy, particularly top footballers, golfers and tennis players. (3) ________ , it is not unusual for some athletes to receive large fees on top of their salary, for advertising products or making personal appearances. A trend towards shorter working hours means that people generally tend to have more free time, both to watch and to take in sporting activity; sport has become a significant part of the recreation industry that we now rely (4) _________ to fill our leisure hours. Professional sport is a vital part of that industry, providing for millions of (5) _________ people all over the world.

Brave William Baldock , who is six years old , is a hero after helping his mother when she fell downstairs . William quickly rang for an ambulance when he discovered his mother had broken her leg . In spite of being frightened , he (1)_____ the emergency services what had happened and answered all the questions they asked him. He also telephoned his father at work, and then his grandmother, to explain what he had (2)______. While waiting for these people to arrive, William looked after his 18-month-old sister. When ambulance man Steve Lyn went to the house , he was amazed: "It's great that a young boy of six knew the right number to deal and was able to give us the correct information.” (3)______ of William's quick thinking , we were able to (4)______ there immediately. Mrs Baldock left hospital yesterday, very (5)______ to both William and the ambulance service.

(52)_______

It can take a long time to become successful in your chosen field, however talented you are. One thing you have to be aware of is that you will face criticism along the way. The world is full of people who would rather say something negative than positive. If you’ve made up your (1)______ to achieve a certain goal, such as writing a novel, don’t let the negative criticism of others prevent you from reaching your target, and let the constructive criticism have a positive effect on your work. If someone says you’re totally in the (2)_______ of talent, ignore them. That’s negative criticism. If, (3)________, someone advises you to revise your work and gives you a good reason for doing so, you should consider their suggestions carefully. There are many film stars who were once out of work . There are many famous novelists who made a complete mess of their first novel – or who didn’t, but had to keep on approaching hundreds of publishers before they could get it (4)_______. Being successful does depend on luck, to a certain extent. But things are more likely to (5)_______ well if you persevere and stay positive.

(73)________

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I/ can/ send/ you/ references/ the Director of the Happy Mind Charity Centre.

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
Throughout the world there are different ways for people to greet each other. In much of the world, a handshake is the (1) __________ form of welcoming and greeting someone. In many countries around the Mediterranean Sea a (2) ___________ kiss on the cheek is the appropriate way to welcome friends and family. It can be a very (3) __________ surprise if you expect to shake hands and get a kiss or a hug instead. At times, it is difficult to tell what sort of greeting (4) ___________ is followed. People may bow, grab another‟s arm or even slap the other person on the back. In some places people just smile, look at the other‟s face and say nothing. Most people in the world are tolerant of visitors and don‟t mind what travellers do that seems wrong as long as the visitors are (5)__________. A big part of the delightfulness of world travel is experiencing different customs.

 Known worldwide by its panda logo, World Wildlife Fund (WWF) is dedicated to protecting ______ world’s wildlife and the rich biological diversity that we all need to survive.

(360)________

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What _________ computer a miraculous device?

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Drawing a Line in the Sand
Artists are known to be a picky bunch. Over years of practice, they often develop a preference for certain materials. For instance, some sculptors will only work with marble, whereas some painters may insist on only using watercolour paints. Yet, only a select few have become masters working with a common material that you can find on any beach: sand. As children, we all made sand castles, but some skilled artists have taken this activity to the next level. They have created impressive, massive sand constructions in the shape of dragons, castles, and everything else you can imagine. A major benefit for many artists who build with sand is its simplicity. To get started, all you need is sand and water. However, mastering this medium takes years of practice and great attention to detail. For example, different tasks require different ratio of water to sand to get the job done. Deciding on the proper tools can also be complicated. Some artists prefer using buckets and shovels, while others are purists who refuse to use anything but their hands. Sand painting is another form of sand art. The practice dates back dozens of thousands of years and has been used by several different cultures. It involves spreading different coloured particles, which often come from crystals and rocks, onto a surface and then arranging them to make a picture. Interestingly enough, many sand paintings are designed to be temporary. Tibetan monks will spend days creating beautiful sand paintings which are blown away by winds shortly after they are finished. They view the natural destruction of their work as a symbol of impermanence in life. Meanwhile, Native Americans consider their temporary sand paintings as living creatures and they treat them with great respect while they exist. Recently, filmmakers have also discovered a way to work with sand by creating sand animation. Like other forms of animation, an artist will create one image and then capture it on camera. Then, they will make some subtle changes and then move on to the next frame and so on. After they have created and captured hundreds of images, the frames will be strung together. In the final product, it will appear as if the sand images are moving or changing shape. The next time you are at the beach, let your mind run free as you look at the shore. Who knows, you might get the urge to create some remarkable sand art of your own.
4. The word “them” in paragraph 3 refers to ___________.

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
MEMO
From: Eun Mi Ha, CEO
To: All Employees
Subject: January 10 Meeting
Date: January 13
As announced at the company meeting on January 10, we will be changingthe regular work hours for most employees as part of our initiative to reduce energy costs. Since our energy costs are generally higher in the late afternoon, it will be to our advantage to perform more work in the morning. Therefore, beginning on Monday, February 24, the workday will officially start at 8:00 A.M. instead of 9:00 A.M., and it will end at 4:00 P.M. instead of 5:00 P.M. The last day of the old schedule will be Friday, February 21, and the office will close at 5 :00 P.M. on that day. Employees in the accounting department will not be affected by the change, since their schedule is determined by normal banking hours.
1. What are employees asked to do?