Each sentence has a mistake. Find it bychosing A B C or D

Today, although their status varies from country to country, women in most parts of the world have gained  significance legal rights

Read the following passage and choose the best answer (A, B, C, D):
The understanding of friendship in children tends to be more heavily focused on areas such as (1)___________ activities, physical proximity, and shared interests. These friendships provide opportunity (2)____________ playing and practicing self-regulation. Most children tend to describe friendship in terms of things like sharing, and children are more likely to share with someone they consider to be a friend. As children mature, they become less individualized and are more aware of others. They gain the ability to (3)_________ with their friends, and enjoy playing in groups. They also experience peer rejection as they move through the middle childhood years. Establishing good friendships at a young age (4)________________ a child to be better acclimated in society later on in their life. Potential benefits of friendship include the opportunity to learn about empathy and problem solving. Coaching from parents can be useful in helping children to make friends. Eileen Kennedy-Moore describes three key ingredients of children’s friendship formation: (1) openness, (2) similarity, and (3) shared fun. Parents can also help children understand social guidelines they haven’t learned on their (5)____________

Read the following passage and choose the best answer (A, B, C, D):
It is natural for young people to be critical of their parents at times and to blame them for most of the misunderstandings between them. They have always complained, more or less justly, that their parents are out of touch with modern ways; that they are possessive and dominant; that they do not trust their children to deal with crises; that they talk too much about certain problems, and that they have no sense of humor, at least in parent-child relationships. I think it is true that parents often underestimate their teenage children and also forget how they themselves felt when they were young. Young people often irritate their parents with their choices in clothes and hairstyles, in entertainers and music. This is not their motive. They feel cut off from the adult world into which they have not yet been accepted. So they create a culture and society of their own. Then, if it turns out that their music or entertainers of vocabulary or clothes or hairstyles irritate their parents, this gives them additional enjoyment. They feel they are superior, at least in a small way, and that they are leaders in style and taste. Sometimes you are resistant and proud because you do not want your parents to approve of what you do. If they approve, it looks as if you are betraying your own age group. But in that case, you are assuming that you are the underdog; you cannot win; but at least you keep your honor. This is a passive way of looking at things. It is natural enough after long years of childhood, when you were completely under your parents’ control. But it ignores the fact that you are now beginning to be responsible for yourself. If you plan to control your life, cooperation can be part of that plan. You can charm others, especially your parents, into doing things the way you want. You can impress others with your sense of responsibility and initiative, so that they will give you the authority to do what you want to do.  
5. Teenagers do not want their parents to approve of whatever they do because they _______

Read the following passage and choose the best answer (A, B, C, D):
War: very bad for humanity, good for heavy metal. And cult Swedish rockers Sabaton are the best of the best when it comes to militaristic concept albums Iron Maiden’s ‘The Trooper’. Black Sabbath’s ‘War Pigs’. ‘One’ by Metallica. ‘Angel Of Death’ by Slayer. It’s quite the playlist. And yet it’s unlikely that anyone will ever rival Swedish power metallers Sabaton for their commitment to writing songs about humans shooting each other and blowing stuff up. Sabaton, it should be made clear, are a band who are named after a piece of armour worn on a medieval knight’s foot. The Swedes’ fourth album, 2008’s seminal ‘The Art Of War’, was a concept album based on the writings of the ancient Chinese military strategist Sun Tzu. And, on stage, they normally perform in front of a tank. This time round the theme is the First World War. It arrives 20 years since the band formed. If you’re a fan of this stuff – powerful, bruising, operatic, performed with absolutely no sense of irony whatsoever – then there’s no question that Sabaton are amongst the best of the best. ‘Fields Of Verdun’ gallops into a colossal hook that’s only superseded by the song’s killer chorus. Opener ‘The Future Of Warfare’ sees singer Joakim Brodén’s vocals building a path skyward, “while” Devil Dogs rampages like Iron Maiden did when punk was still part of their repertoire. This is the album that could take Sabaton upwards. The subject matter might be heavy, but Sabaton deserve credit for managing to deliver often difficult themes in a way that still manage to be fun – a quality the genre they exist within has lost sight of in recent times – while also maintaining some respect for the fallen 
4. The word “their” in paragraph 3 refers to _______

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
Clara Barton became known as “The Angel of the Battlefield” during the American Civial War. Born in Oxford, Massachusetts in 1821, Clara Barton’s interest in helping soldiers on the battlefield began when she was told army stories from her father. Another event that influenced her decision to help soldiers was an accident her brother had. His injuries were cared for by Barton for 2 years. At the time, she was only 11 years old. Barton began teaching school at the age of 15. She taught for 18 years before she moved to Washington, D.C. in 1854.
The civil war broke out 6 years later. Immediately, Barton started was service by helping the soldiers with their needs. At the battle of Bull Run, Clara Barton received permission from the government to take care of the sick and hurt. Barton did this with great empathy and kindness. She acknowledged each soldier as a person. Her endurance and courage on the

battlefield were admired by many. When the war ended in 1865, she used 4 years of her life to assist the government in searching for soldiers who were missing during the war.
The search for missing soldiers and years of hard work made her feeble physically. In 1869, her doctors recommended a trip to Europe for a rest. While she was on vacation, she became involved with the International Red Cross, an organization set up by the Geneva Convention in 1864. Clara Barton realized that the red Cross would be a big help to the United States. After she returned to the United States, she worked very hard to create an American red Cross. She talked to government leaders and let American people know about the Red Cross. In 1881, the Notional Society of the Red Cross was finally established with its headquarters in Washington, D.C. Clara Barton managed its activities for 23 years.
Barton never let her age stop her from helping people. At the age of 79, she helped flood victims in Galveston, Texas. Barton finally resigned from the Red Cross in 1904. She was 92 years old and had truly earned her titled “The Angel of the Battlefield”.

The word “this” in paragraph 2 refers to

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 following questions:
If you were going to choose a job that involves travel, what would be your first choice? There are many jobs available today that give people opportunities to travel. Although may traveling careers sound fantastic, they also have disadvantages.
Being an au pair is an excellent way to not only go to different countries, but to live in different places around the world and really get a feel for the culture. Au pairs lives with the families they are placed with and take of children. Many parents include au pairs in family events and vacations, so they experience many aspects of the new culture while on the job. However, many of the activities are centered around the children, so they may not get to experience many things that interest adults.
For people who want a bit more freedom working abroad, being an English teacher maybe a good choice. There are English teaching jobs in almost countries in the world. People teaching English in other countries often have a chance to travel on the weekends around the country. One drawback is that many teachers often wind up hanging out with other English teachers, and they don’t have time to learn the country’s language.
The nickname “roadie” implies that this job involves life on the road. Roadies are people who work and travel with bands and provide technical support. Roadies can be lighting and stage crew who set up the stage and break it down before and after events. They can also be technicians helping band members with their instruments. International tours take a band’s crew to cities around the world, often requiring air travel. However, the crew doesn’t get much time off, so they may travel to several countries without seeing much besides concert venues and hotels.
Similarly, flight attendants often travel to cities around the world, but they don’t see much besides the inside of airplanes and hotels. However, when they do have time off, they can often fly at no cost, and family member can sometimes fly free as well. Its is widely thought that a flight attendant job is
glamorous, but flight attendants must deal with travel hassles, as well as security issues.
All jobs gave advantages and disadvantages whether or not you travel for work, so if you have the travel bug, keep these jobs in mind for the future.

How is a flight attendant’s job similar to a roadie’s?

Read the following passage and choose the best answer (A, B, C, D):
If you want to volunteer to help boost your career, think carefully about the skills and  experience you need. Don’t be afraid to be upfront about this when you apply (1)_________ opportunities – as long as you are willing to show commitment to your voluntary work, most organizations will welcome the fact that it could have benefits for you. Volunteering can give you a broad (2) ________ of learning opportunities:  • Many volunteer placements will allow you to study and develop your “key skills”, (3) _________ skills you need to get on in the workplace, in learning and in life.  • Some volunteers receive vocational training in (4) _________ areas such as social care, working with the elderly, or working with children.  • Some roles require specific training such as volunteering as a special constable with your local police force.  The organization you work for usually covers your training costs and expenses in (5) ________ for your time and commitment

Swine influenza (also called swine flu, hog flu and pig flu) is an infection of a host animal by any one of several specific types of microscopic organisms called "swine influenza virus". A swine influenza virus (SIV) is any strain of the influenza family of viruses that is usually hosted by (is endemic in) pigs. As of 2009, the known SIV strains are the influenza c virus and the subtypes of the influenza A virus known as HI N1, H1N2, H3N1, H3N2 and H2N3. Swine influenza is common in pigs in the mid-western United States (and occasionally in other states), Mexico, Canada, South America, Europe (including the UK, Sweden and Italy) Kenya Mainland China, Taiwan Japan and other parts of eastern Asia.

Transmission of swine influenza vims from pigs to humans is not common and does not always cause human influenza, often only resulting in the production of antibodies in the blood. The meat of the animal poses no risk of transmitting the virus when properly cooked. If transmission does cause human influenza, it is called zoonotic swine flu. People who work with pigs, especially people with intense exposures, are at increased risk of catching swine flu. In the mid-20th century, identification of influenza subtypes became possible. This allows accurate diagnosis of transmission to humans. Since then, fifty confirmed transmissions have been recorded. Rarely, these strains of swine flu can pass from human to human. In humans, the symptoms of swine flu are similar to those of influenza and of influenza-like illness in general namely chills fever sore throat, muscle pains severe headache, coughing, weakness and general discomfort.

The 2009 flu outbreak in humans known as "swine flu" is due to a new strain of influenza A virus subtype H1N1 that contains genes closely related to swine influenza. The origin of this new strain is unknown. However, the World Organization for Animal Health (OIE) reports that this strain has not been isolated in pigs. This strain can be transmitted from human to human, and causes the normal symptoms of influenza.

The word "strain" can be replaced by.

Read the following passage and choose the best answer (A, B, C, D):
Christmas is around the corner, which means it’s about time you examined carefully your holiday gift list. “Choosing the wrong gift can be kind of risky for relationships because it implies that you and the receiver don’t have anything in common,” says Elizabeth Dunn, a psychology professor at the University of British Columbia in Canada. Her research has also showed that undesirable gifts can sometimes negatively impact the receiver’s perception of a relationship’s future potential. Since you don’t want your holiday gift to cause more harm than good, how can you be sure to choose a gift the receiver will love? Psychology may have the answer. Contrary to common belief, studies have actually shown that spending more does not always guarantee a well-received gift. “It seems quite self-evident to most of us that if you spend more, you’re going to get a better girl. But as it turns out, there’s no evidence that recipients associate the cost of a gift with how much they enjoy that gift,” says Jeff Galak, an associate professor of marketing at the Carnegie Mellon Tepper School of Business in the US city of Pittsburgh. Galak acknowledges that your gift may have to hit a certain price due to tradition or expectations. “But once you meet that cost, it doesn’t matter at all if you buy something even more valuable than that limit,” he says. Galak says the trick for giving a great and unforgettable gift is to think past the moment of handing it over. “When most givers give gifts, they try to make the moment they give the gift perfect and want to see the smile on recipient’s face right in that moment,” says Galak. “But in reality, what most recipients really love about a gift is how much value they’re going to derive from it over an extended time period.” In other words, it might be exciting to watch a friend open a gift of a concert ticket, but since it’s a gift that cannot be enjoyed over time, it may soon be forgotten. It is also suggested that if you can’t think of a good gift, just ask the recipient what they want. “People want to be creative and surprise the recipient,” says Dunn. “but the better gift will be whatever it is they say they like.” At the end of the day, don’t fret too much about giving a terrible gift. Unless something is wildly inappropriate, the recipient will fell some level of appreciation. Galak says that over the course of his research he has asked thousands of participants about gifts they have received, and he rarely hears someone talk about a bad girl. And even if you do give a sub-standard gift to someone you are close to you may be saved by your thoughtfulness. “When someone does something puzzling that needs to be explained – like give a bad gift – that’s when you think about what’s on the other person’s mind,” says Nicholas Epley, a professor at the University of Chicago Booth School of Business. His research shows that if your recipient feels like you at least spent a lot of time making your selection, they’ll appreciate the effort that went into choosing a less desirable gift. In other words, the old saying ‘it’s the thought that counts’ really might be true.  
2. Which of the following is NOT TRUE, according to paragraph 2?

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In 1959 Xerox created the first plain paper copy machine. It was one of the most  successful products ever. The company name Xerox grew into a verb that means “to copy,” as in “Bob, can you Xerox this for me?” Around 50 years later, the same thing happened to Google. Their company name grew into a verb that means “to do an internet search.” Now everyone and their grandma knows what it means to Google it.  Unlike Xerox, Google wasn’t the first company to invent their product, not by a long shot. Lycos released their search engine in 1993. Yahoo! came out in 1994. AltaVista began serving results in 1995. Google did not come out until years later, in 1998. Though a few years difference may not seem like much, this is a major head start in the fast moving world of tech. So how did Google do it? How did they overtake their competitors who had such huge leads in time and money? Maybe one good idea made all the difference.  There are millions and millions of sites on the internet. How does a search engine know which ones are relevant to your search? This is a question that great minds have been working on for decades. To understand how Google changed the game, you need to know how search engines worked in 1998. Back then most websites looked at the words in your query. They counted how many times those words appeared on each page. Then they might return pages where the words in your query appeared the most. This system did not work well and people often had to click through pages and pages of results to find what they wanted.  Google was the first search engine that began considering links. Links are those blue underlined words that take you to other pages when you click on them. Larry Page, cofounder of Google, believed that meaningful data could be drawn from how those links connect. Page figured that websites with many links pointing at them were more important than those that had few. He was right. Google’s search results were much better than their rivals. They would soon become the world’s most used search engine.  It wasn’t just the great search results that led to Google becoming so wellliked. It also had to do with the way that they presented their product. Most of the other search engines were cluttered. Their home pages were filled with everything from news stories to stock quotes. But Google’s homepage was, and still is, clean. There’s nothing on it but the logo, the search box, and a few links. It almost appears empty. In fact, when they were first testing it, users would wait at the home page and not do anything. When asked why, they said that they were, “waiting for the rest of the page to load.” People couldn’t imagine such a clean and open page as being complete. But the fresh design grew on people once they got used to it. 
8. The word ’it’ in the last paragraph refers to ____

Read the following passage and choose the best answer (A, B, C, D):
At its narrowest point, Vietnam is only 30 miles (48 kilometers) wide. Two of Vietnam’s largest rivers, the Mekong in the south and the Red in the north, end at the South China Sea in huge swampy plains called (1)________ . These regions are home to most of the country’s people and provide (2)________ ground to grow rice and many other crops. Vietnam’s mountainous terrain, forests, wetlands, and long coastline contain many different habitats that support a great (3)________ of wildlife. Some 270 types of mammals, 180 reptiles, 80 amphibians, and 800 bird species reside in Vietnam Many rare and unusual animals live in Vietnam, (4)________ giant catfish, Indochinese tigers, Saola antelopes, and Sumatran rhinos. The government has set up 30 parks and reserves to protect its animals, but their survival is (5) ________doubt because much of their habitat has been cleared for lumber or to grow crops

rewrite the sentence:
Tom reviewed the lessons carefully. He could finish the test very well.

Read the following passage and choose the best answer (A, B, C, D):
Practical experience is a must-have for today’s job seekers. According to Brazen Life’s Huffington Post article titled “Why Gaining Work Experience Is More Important Than Your Education,” many colleges and universities report that students who have completed an internship or gained work experience during their studies have higher rates of getting hired. For example, at Iowa State University, of all students who completed a co-op program to earn a BS in engineering, an astounding 90 percent got jobs after graduation. Why is practical experience so important? There are a number of reasons why you need practical work experience. First, it’s simply the smart thing to do when you’re preparing for a career in a specific field. Let’s say it’s your dream to work as a consultant for an international corporate relocation company because you love international travel and you like organizing things. So you get a part-time job working as an office assistant at a corporate relocation company… and you find out it’s very different from what you expected. In short, you realize this isn’t the job for you-and you can concentrate on finding another job where you can put your passion and skills to work, for example in the tourism industry. Alternatively, you might find out that you enjoy the corporate relocation business. That means you’re gaining invaluable industry experience that will look great on your resumé when you apply for a full-time job.  Second, practical work experience teaches valuable soft skills, such as discipline, perseverance, teamwork, leadership skills, communication skills and problem solving. Employers will look for these in candidates and they’ll want to see proof. If you’ve spent a month as a team leader at Homes for Heroes, the leadership skills, teamwork experience and problem-solving abilities you developed there can add significant value to your candidacy. Third, working helps you build your network and can provide you with contacts in your chosen field. These contacts can be extremely useful when it comes to hearing about job leads and interesting opportunities. In addition, if you’ve impressed someone, he or she might be willing to write you a letter of recommendation for a job or a place in a graduate program.  Finally, the company you’re working for might offer you a position after you’ve graduated. Your employer already knows your skills and abilities, and you’re already acquainted with the company-so it’s a win-win situation! 
6. Which of the following statements is TRUE, according to the passage?

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
There are three valid arguments to support the preservation of endangered species. An aesthetic justification contends that biodiversity contributes to the quality of life because many of the endangered plants and animals are particularly appreciated for their unique physical beauty. The aesthetic role of nature in all its diverse forms is reflected in the art and literature of every culture, attaining symbolic status in the spiritual life of many groups. According to the proponents of the aesthetic argument, people need nature in all its diverse and beautiful forms as part of the experience of the world.
Another argument that has been put forward, especially by groups in the medical and pharmacological fields, is that of ecological self-interest. By preserving all species, we retain a balance of nature that is ultimately beneficial to humankind. Recent research on global ecosystems has been cited as evidence that every species contributes important or even essential functions that may be necessary to the survival of our own species. Some advocates of the ecological argument contend that important chemical compounds derived from rare plants may contain the key to a cure for one of the diseases currently threatening human beings. If we do not protect other species, then they cannot protect us.
Apart from human advantage in both the aesthetic and ecological arguments, the proponents of a moral justification contend that all species have the right to exist, a viewpoint stated in the United Nations World Charter for nature, created in 1982. Furthermore, if humankind views itself as the stewards of all the creatures on Earth, then it is incumbent upon human beings to protect them, and to ensure the continued existence of all species. Moral justification has been extended by a movement called “deep ecology,” the members of which rank the biosphere higher than people because the continuation of life depends on this larger perspective. To carry their argument to its logical conclusion, all choices must be made for the biosphere, not for people.

The word “them” in paragraph 3 refers to     .

Read the following passage and choose the best answer (A, B, C, D):
During the past half-century, our species has embarked on a remarkable social  experiment. For the first time in human history, great numbers of people – at all ages, in all places, of every political persuasion – have begun settling down as singletons. Until the second half of the last century, most of us married young and parted only at death. If death came early, we remarried quickly; if late, we moved in with family, or they with us. Now we marry later. We divorce, and stay single for years or decades.  The rise of living alone has produced significant social benefits, too. Young and middle-aged solos have helped to revitalise cities, because they are more likely to spend money, socialise and participate in public life. Contemporary solo dwellers in the US are primarily women: about 18 million, compared with 14 million men. The majority, more than 16 million, are middle-aged adults between the ages of 35 and 64. The elderly account for about 11 million of the total. Young adults between 18 and 34 number increased more than 5 million, compared with 500,000 in 1950, making them the fastest-growing segment of the solo-dwelling population.  Despite fears that living alone may be environmentally unsustainable, solos tend to live in apartments rather than in big houses, and in relatively green cities rather than in cardependent suburbs. There’s good reason to believe that people who live alone in cities consume less energy than if they coupled up and decamped to pursue a single-family home.
3. The word “them” in paragraph 2 refers to_______________?

Read the following passage and choose the best answer (A, B, C, D):
The Moon is our close cosmic neighbor, and humans have been exploring its surface ever since they first developed telescopes. The first lunar exploration vehicles of the 1950s were primitive pioneers. But aerospace technology developed so rapidly that only about a decade separated the first flyby forays and Neil Armstrong’s history-making steps on the Moon’s surface. In January 1959, a small Soviet sphere bristling with antennas, dubbed Luna 1, flew by the Moon at a distance of some 3,725 miles (5,995 kilometers). Though Luna 1 did not impact the Moon’s surface, as was likely intended, its suite of scientific equipment revealed for the first time that the Moon had no magnetic field. The craft also returned evidence of space phenomena, such as the steady flow of ionized plasma now known as solar wind. Later in 1959, Luna 2 became the first spacecraft to land on the Moon’s surface when it impacted near the Aristides, Archimedes, and Autolycus craters. A third Luna mission subsequently captured the first blurry images of the far–or dark–side of the Moon. In 1962 NASA placed its first spacecraft on the Moon—Ranger 4. The Ranger missions were kamikaze missions; the spacecraft were engineered to streak straight toward the Moon and capture as many images as possible before crashing onto its surface. Unfortunately, Ranger 4 was unable to return any scientific data before slamming into the far side of the Moon. Two years later, however, Ranger 7 streaked toward the Moon with cameras blazing and captured more than 4,000 photos in the 17 minutes before it smashed onto the surface. Images from all the Ranger missions, particularly Ranger 9, showed that the Moon’s surface was rough. They spotlighted the challenges of finding a smooth landing site on its surface. In 1966 the Soviet spacecraft Luna 9 overcame the Moon’s topographic hurdles and became the first vehicle to soft-land safely on the surface. The small craft was stocked with scientific and communications equipment and photographed a ground level lunar panorama. Luna 10 launched later that year and became the first spacecraft to successfully orbit the  Moon. The Surveyor space probes (1966-68) were the first NASA craft to perform controlled landings on the Moon’s surface. Surveyor carried cameras to explore the Moon’s surface terrain, as well as soil samplers that analyzed the nature of lunar rock and dirt. In 1966 and 1967 NASA launched lunar orbiters that were designed to circle the Moon and chart its surface in preparation for future manned landings. In total, five lunar orbiter missions photographed about 99 percent of the Moon’s surface. On July 20, 1969, Neil Armstrong and Edwin “Buzz” Aldrin became the first people to reach the Moon when their Apollo 11 lunar lander touched down in the Sea of Tranquility. Later missions carried a lunar rover that was driven across the satellite’s surface, and saw astronauts spend as long as three days on the Moon. Before the Apollo project ended in 1972, five other missions and a dozen men had visited the Moon. After the dramatic successes of the 1960s and 1970s, the major space programs turned their attention elsewhere for a period of several decades. 
2. According to the paragraph 2, which sentence is CORRECT about the Luna spheres?

Choose the best answer:
Don't forget _____ your identity card with you to the interview.

Each sentence has a mistake. Find it by chosing A B C or D

 You’re facing a much more experienced opponents in tomorrow’s match

Read the following passage and choose the best answer (A, B, C, D):
Just as optical fibers have transformed communication, they are also revolutionizing medicine. These ultra - thin, flxible fiers have opened a window into the living tissues of the body. By inserting optical fibers through natural openings or small incisions and the threading them along the body's established pathways, physicians can look into the lungs, intestines, heart and other areas that were formerly inaccessible to them. The basic fiber-optics system is called fiberscope, which consists of two bundles of fibers. One, the illuminating bundle, carries light to the tissues. It is coupled to a high-intensity light source. Light enters the cores of the high-purity silicon glass and travels along the fibers. A lens at the end of the bundle collects the light and focuses it into the other bundle, the imaging bundle. Each fibers in the bundle transmits only a tiny fraction of the total image. The reconstructed image can be viewed through an eyepiece or displayed on a television screen. During the last five years, improved methods of fabricating optical fibers have led to a reduction in fiberscope diameter and an increase in the number of fibers, which in turn has increased resolution. Optical fibers can also be used to deliver laser light. By use of laser beams, physicians can perform surgery inside the body, sometimes eliminating the need of invasive procedures in which healthy tissue must be cut through to reach the site of disease. Many of these procedures do not require anesthesia and can be performed in a physician's office. These techniques have reduced the risk and the cost of medical care.
8. The word "resolution" is closest in meaning to which of the following?

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The World Health Organization on Wednesday declared the rapidly spreading  coronavirus outbreak a pandemic. Director-General Tedros Adhanom Ghebreyesus said that “We expect to see the number of cases, the number of deaths, and the number of affected countries climb even higher.”  WHO officials had said earlier they were hesitant to call the outbreak a pandemic in case it led governments and individuals to give up the fight. On Wednesday, they stressed that fundamental public health interventions can still limit the spread of the virus and drive down cases even where it was transmitting widely, as the work of authorities and communities in China, Singapore, and South Korea has shown.  The virus, which probably originated in bats but passed to people via an as yet unrecognized intermediary animal species, is believed to have started infecting people in Wuhan, China, in late November or early December. Since then the virus has raced around the globe. South Korea, which has reported nearly 8,000 cases, also appears poised to bring its outbreak under control with aggressive measures and widespread testing. But other countries have struggled to follow the leads of China and South Korea — a reality that has frustrated WHO officials who have exhorted the world to do everything possible to end transmission of the virus. Tedros used the fact that 90% of the cumulative cases have been reported in just four countries as evidence that the rest of the world still had time to prevent an explosion of cases with action.  WHO officials also stressed that countries should be implementing a strategic combination two types of measures. One involves trying to detect and stop known chains of transmission by isolating cases and following and potentially quarantining their contacts. The other involves community-level steps like social distancing and comes into play when the virus is spreading more broadly and transmission chains can’t be tracked. Mike Ryan, the head of the WHO’s emergency program, said that the public health interventions might not have straightforward effect, but to slow the spread of the virus. People with severe cases can require long periods of critical care and strain the resources of hospitals. He said he was worried about “the case load, the demand on the health workers, the dangers that come with fatigue, and potentially shortages of personal protective equipment.”
3. The word “it” in paragraph 2 refers to _____

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Most sources of illumination generate light over an appreciable period, and indeed if  an object is lit for a very brief time(less that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic flash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense flash. A contemporary observer reported that “this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”  The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920’s. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen difluoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reflecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time. 
3. The word “ignited” in paragraph 1 is closest in meaning to __________