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By the end of last summer, Alexander _______ his Ph.D.

 

 

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According to the report, we can expect some pretty remarkable changes to our homes  and our personal spaces, overlooked things that make up so much of our daily routine. As human populations soar, our cities and homes will have to adapt; interior living spaces will change as a cloud changes, easily reconfigured and rearranged to suit our fickle tastes, or accommodate different purposes.  Imagine walls and floors made of a malleable “skin,” and embedded with tiny sensors and actuators so that the shape and size of living spaces can quickly change, or even be divided into smaller rooms; imagine fully programmable “smart homes” that can be controlled remotely, and provide feedback to their owners - yes, there’ll even be an app for that.  Virtual decorations will alter with changing tastes, moods and whims; and the entire interior surface of the home will be implanted with LED technology - television screens and computer displays will form and unform in any room, as needed. Even our furniture will be adaptable, molding to custom fit our bodies, responding to changes in posture, or disappearing altogether when not needed.  It will be the ultimate evolution of the “Internet of Things.” Misplaced something? Can’t find your keys? No problem. Just use an online search function to find it. Hate the color of that accent wall? Delete it. Need more storage space? Watch new shelves appear, as if by magic. And the amenities are fantastic. Every home will come standard with a 3D printer; they’ll be able to churn out just about anything you could wish, using downloadable patterns, probably including even complex electronic devices. They may even print out your meals, designed and programmed by the world’s master chefs.  Walk-in “medical pods,” meanwhile, will contribute to the decentralization of healthcare - their imaging sensors will diagnose your ills and, for the more easily treatable maladies, dispense drugs, inject antibiotics, and recommend health regimens. It may even be possible to undergo remote, robot-mediated surgery, in the comfort of your own home.  This barely scratches the surface. Imagine homes whose very building material is salted with dormant limestone-producing bacteria, which awaken upon contact with moisture and repair any cracks or structural damage.  There will be “digestion tanks” full of anaerobic bacteria, to dispose of our waste; and our homes will produce, store, and reuse their own energy, using “microbial fuel cell stacks” and more efficient solar panels to generate electricity, and power-banks like the Tesla power wall to store it against future use. Personal homes will be almost fully independent of a dangerously overtaxed energy grid.  One hundred years in the future, our houses will be, in almost all respects, semiliving, artificial organisms - closed systems with a metabolism, sensory apparatus, immune response, and an approximation to a nervous system. We’ll be living in homes that are practically alive.
1. Which of the following does the passage mainly discuss?

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Pollutants in the air aren’t always visible and come from many different sources. Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution - some visible, some invisible - that contribute to global warming. Generally any substance that people introduce into the atmosphere that has damaging effects on living things and the environment is considered air pollution. Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. In the past 150 years, such activities have pumped enough carbon dioxide into the atmosphere to raise its levels higher than they have been for hundreds of thousands of years. Other greenhouse gases include methane - which comes from such sources as swamps and gas emitted by livestock - and chlorofluorocarbons (CFCs), which were used in refrigerants and aerosol propellants until they were banned because of their deteriorating effect on Earth’s ozone layer. Another pollutant associated with climate change is sulfur dioxide, a component of smog. Sulfur dioxide and closely related chemicals are known primarily as a cause of acid rain. But they also reflect light when released in the atmosphere, which keeps sunlight out and causes Earth to cool. Volcanic eruptions can spew massive amounts of sulfur dioxide into the atmosphere, sometimes causing cooling that lasts for years. In fact, volcanoes used to be the main source of atmospheric sulfur dioxide; today people are. Industrialized countries have worked to reduce levels of sulfur dioxide, smog, and smoke in order to improve people’s health. But a result, not predicted until recently, is that the lower sulfur dioxide levels may actually make global warming worse. Just as sulfur dioxide from volcanoes can cool the planet by blocking sunlight, cutting the amount of the compound in the atmosphere lets more sunlight through, warming the Earth. This effect is exaggerated when elevated levels of other greenhouse gases in the atmosphere trap the additional heat.
1. According to the passage, some kind of air pollution ____

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The print media includes newspapers, magazines, brochures, newsletters, books and even leaflets and pamphlets. Visual media like photography can also be mentioned under this sub-head, since photography is an important mass media, which communicates via visual representations. Although it is said that the electronic or new media have replaced the print media, there exists a majority of audiences who prefer the print media for various communication purposes. Public speaking and event organizing can also be considered as a form of mass media. For many people, it is impossible to imagine a life without their television sets, be it the daily news dose or even the soap operas. This mass media includes television and radio. This category also included electronic media like movies, CDs and DVDs as well as the new hottest electronic gadgets.  With the advent of new technologies like Internet, we are now enjoying the benefits of high technology mass media, which is not only faster than the old-school mass media, but also has a widespread range. Mobile phones, computers and Internet are often referred to as the new-age media. Internet has opened up several new opportunities for mass communication which include email, websites, blogging, Internet television and many other mass media which are booming today. Mass media was developed as a means of social responsibility at the beginning. However, in the course of time, they have attained the status of an industry. Besides the social and industrial nature of mass media, the following common points may also be mentioned. Specifically, it is highly impersonal, because the masses are not identifiable based on perfectly defined audio, visual or written messages. In addition, it is never likely to reach 100 percent of the target nor to have more than 10 percent effectiveness in most of the cases. Contents are generally based on the broad social issues and aspiration of the target audience which may be designed to achieve some specific goals; and all in all, modern mass media draw heavily on technology  
1. What types of media is photography now considered belonging to?

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The Sahara Desert is the world’s largest hot desert. The Sahara is in North Africa and is as large as the United States. Many people think that an area like this has no animals or plant life, but they are (1) __________. In fact, the Sahara Desert has many different ‘ecoregions’. Each ecoregion has different plants and animals (2)_________there. The biggest ecoregion is called the ‘Sahara Desert ecoregion.’ In this area, the climate is extremely dry and extremely hot. The landscape is sandy and dusty with many high dunes. Because the Sahara Desert ecoregion is so hot and dry, there are very few plants and animals. Scientists estimate that there are only 500 species of plants. This is not very much when thinking of (3)_________ enormous the region is. These plants include acacia trees, palms, spiny shrubs, and grasses. The Sahara is also home to 70 species of mammals. Twenty of these are large mammals. There are about 90 species of birds and around 100 reptiles. The biggest threat to plants and animals in this environment is drying (4)_______. Because of this, plants have the ability to recover their health after their leaves have dried out completely. Animals can lose 30-60% of their body mass and still survive. Most animals do not get their water from drinking like other ecosystems. Instead, they have adapted to get their water through metabolic processes. This is why they can survive in a place (5)______ the Sahara Desert ecosystem

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Marriage is an ancient religious and legal practice celebrated around the world. However, wedding customs vary from country to country. The Wedding Dress: In many countries, it is customary for the bride to wear a white dress as a symbol of purity. The tradition of wearing a special white dress only for the wedding ceremony started around 150 years ago. Before that, most women could not afford to buy a dress that they would only wear once. Now, bridal dresses can be bought in a variety of styles. In some Asian countries and in the Middle East, colors of joy and happiness like red or orange other than white are worn by the bride or used as part of the wedding ceremony. The Wedding Rings: In many cultures, couples exchange rings, usually made of gold or silver and worn on the third finger of the left or right hand, during the marriage ceremony. The circular shape of the ring is symbolic of the couple’s eternal union. In Brazil, it is traditional to have the rings engraved with the bride’s name on the groom’s ring, an vice versa. Flowers: Flowers play an important role in most weddings. Roses are said to be the flowers of love, and because they usually bloom in June, this has become the most popular month for weddings in many countries. After the wedding ceremony, in many countries the bride throws her bouquet into a crowd of well-wishers – usually her single female friends. The person who catches this bouquet will be the next one to marry. Gifts: In Chinese cultures, wedding guests give gifts of money to the newly-weds in small red envelopes. Money is also an appropriate gift at Korean and Japanese wedding. In many Western countries, for example in the U.K, wedding guests give the bride and groom household items that they may need for their new home. In Russia, rather than receiving gifts, the bride and groom provide gifts to their guests instead. With the continued internationalization of the modern world, wedding customs that originated in one part of the world are crossing national boundaries and have been incorporated into marriage ceremonies in other countries. 
7. According to the passage, in which country would the wedding guests give the bride and groom money as a present?

Read the passage carefully, then choose the correct answers.

The dramatic growth of the world's population in the twentieth century was on a scale without parallel in human history. Most of this growth had occurred since 1950 and was known as the population 'explosion'. Between 1950 and 1980 the world population increased from 2.5 to over 4 billion, and by the end of the twenty century the figure had risen to about 6.6 billion. Growth of this size cannot continue indefinitely. Recent forecasts suggest that the total population will level out at between 10 and 15 billion in the mid twenty first century. Already there are encouraging signs that the rate of increase in many less developed countries is beginning to slow down.

It has been forecast that, by the middle of the twenty-first century _____.

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Which channel do you recommend to someone __________ likes animals?

Rewrite the sentence:
“I will help you with the housework”, Mai said to me.

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The elusive “generation gap” is construed as being widest when one of the two  generations is the adolescent. While the gap exists in almost all facets of social and personal domains, never is it more evident than in the field of technology, where one of the generations is a digital native and the other, an immigrant or even an alien, depending upon the stage of the continuum of adulthood. The use of gadgets itself is markedly influenced by age, as shown in Pew Research Center’s Internet & American Life Project that studied how different generations use technology.  Although cell phones are now the predominant form of interpersonal communication, the way they are used significantly varies between generations. Youngsters use their phones for a variety of activities such as taking photos, texting, going online, instant messaging, emailing, playing games, listening to music, and even recording and watching videos while adults progressively according to their age progression, restrict the use of these devices to fewer and fewer activities. Interestingly, Pew Research found that the one cell phone activity that transcends age is taking photos, with adults just as likely to click photos on the cell phone cameras as the young. However, the type of photos taken differs, with adolescents clicking more selfies that adults.  The Internet seems to be a good leveler of digital use, at least within the US. While fewer than 60% of senior citizens (ages >65) are conversant with and use the Internet in 2014, the percentages are comparable for all other age groups; 92% for teens, 97% for young adults (18-29 years), 94% for the mid-lifers (30-49%) and 88% for older adults (50-64%). How the internet is used also varies among age groups. While teenagers and young adults under age 30 use the Internet to find information, socialize, play, shop and perhaps conduct business, older users visit government websites or seek financial information online. However, this gap is narrowing, according to Pew Research, and activities such as emails and search engines being increasingly used by all age groups that are online.  Social media is another area where there is an age difference. While the percentage of adults who use social media (72%) is not that different from the youngsters in it (81%), there is a difference in the type of social media applications that is favored. Youngsters (teens and young adults) seem more prevalent in social media applications such as Facebook and Twitter while adults dominate tumblr, Instagram and Pinterest. Adults are largely passive or semi-active users of social media as seen in that adults typically add contacts only on request while adolescents actively seek new friendships. Adolescents use the social media platform as a conversation space and an outlet for self-expression, aimed largely at building new relationships while adults use social media to maintaining existing relationships. Adults have fewer contacts with a third of the adults in social media admitting to having family as their main contact group. Contrast this with the fact that only 10 and 15 percent of adolescents reported to have family in their social media contact list.
7. The following are true about social media, EXCEPT ___________

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Business dealings are becoming more and more commonplace in Vietnam, as the  country’s economy is expanding at an unprecedented rate. In order to gain the respect and favour of any prospective business partners in the country, it is important to familiarise yourself with practices and etiquette that are integral to successful commerce. Doing so will communicate not only your familiarity with their way of life, but also your suitability as a partner and will underline your business acumen.  Regarding business meeting, the first meeting should not discuss business and should be seen only as an opportunity to get to know your counterpart and cultivate a good working relationship with them. While placing hands together and bowing your head is the traditional form of greeting in Vietnam, it has been all but eradicated by the westernisation of society. As a result, you should always shake the hand of a person you are meeting for the first time - especially if they are of the same sex. When meeting a female, you should wait for her to extend her hand first; if she does not, simply nod your head. Follow your new colleague’s lead in all matters. If they shake with both hands (left hand placed upon top of right), do the same.  The next important point is that the exchange of business cards is an important ritual in Vietnamese culture. Because of this, always make sure you bring a business card to exchange at any meeting, no matter how small or trivial it may seem. Ideally, this will be printed in both English and Vietnamese and you should always offer it using both hands. When receiving a card from someone else, accept it with both hands and study it thoroughly before putting it away to show respect. The translation of all documents into Vietnamese will demonstrate your regard for your prospective partners and your preparation in the business world.  
2. How did Vietnamese business people use to greet each other formally?

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The idea of going overseas to study can be daunting, with visions of baffling languages or nights spent in isolation while you are gradually forgotten by your friends and family. (1) _________, the benefits of studying abroad - such as broadening your mind, improving your career prospects and making friends from all over the world - can make digging out your passport really rewarding. “Studying abroad is an eye-opening experience,” says Anna Boyd, event manager at The Student World. “Being (2) _________ in another culture, understanding differences and spotting similarities, living on a beach or in the mountains, (3) _________ will have an impact on every student.” Overseas study comes in many shapes and sizes. It might be a single semester abroad via an Erasmus programme, for example. Or you might elect to follow a full three- or fouryear degree programme. Whatever your ambition, the key is starting early. Some countries require specific combinations of A-levels from UK students. Germany looks for four A-levels including maths or science and one modern foreign language, for instance, while others, such as the US, value extracurricular activities. Starting our research well ahead (4) _________ time can help you make the right choices. “Getting involved in sports, arts and music is also worth considering, as well as gaining experience through volunteering and work placements,” says Boyd. In fact, applying to study abroad could even work to your advantage , for example, you might encounter lower (5) _______ requirements

Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful. In fact, there are about four thousand books with titles that begin with the words “How to”. One book may tell you how to earn more money. Another may tell you how to save or spend it and another may explain how to give your money away.

Many How-to books give advice on careers. They tell you how to choose a career and ‘now to succeed in it. If you fail, however, you can buy the book ” How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all, you may need a book called “How to Live on Nothing”.

One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love every Minute of Your Life”. If you are tired of books on happiness, you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house.

Why have How-to books become so popular? Probably because life has become so complex. Today people have far more free time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life.

The word “step-by-step” in paragraph 3 is closest in meaning to

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The fresh data released by the Centre for Monitoring Indian Economy (CMIE)  showed that unemployment rate in the month of October jumped to 8.5 per cent, which is the highest in over three years. A new academic research paper released by the Centre of Sustainable Employment also concluded that there has been a marked decline in total employment in India between 2011-12 and 2017-18, reported The Indian Express.  The research paper by Santosh Mehrotra and Jaiati K Parida stated as, "However, due to sharp increases in enrollment at every level of education over the noughties, it was expected that post -2012 total employment would increase, particularly in the non-farm sectors. But unfortunately, total employment during 2011-12 and 2017-18 declined by 9 million. The research further states that this happened for the first time in India’s history.  It is really ironical noting that Coimbatore Municipal Corporation posted a vacancy for 549 sanitary workers. What followed was that 7000 highly qualified applicants even some of them with engineering and graduate degrees applied for the job. The Corporation witnessed the overwhelming turnout of 7000 candidates. Similarly, few month back, Chennai witnessed an unusual event when around 4600 of youth sent their application for 14 posts like sweepers and sanitary workers. The applicants had professional qualification like B.Tech, M.Tech, Master of Business Administration.  Though the government constantly has been refuting the grim of job data but the facts and figures can’t be avoided any more. Therefore, now the government should take an initiative to overcome the high prevalence of unemployment and figure out the derivers of the job crisis. In this regard, it is worth to mention a book titled ‘Job crisis in India’ written by business journalist Raghavan Jagnnathan. The author in his book pointed out factors and reasons behind this decline of employment. He attributed that the absence of skills required in the highly technical nature of jobs is big factor. Another aspect of this is that in the majority of cases the skills or training acquired by the youths do not match or suit the core demand of the job. So at first the government must step up for reformation, innovation and renovation of the standard of the education in universities and colleges. 
2. The word “marked” in paragraph 1 is closest in meaning to _______

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Women’s representation in government is stalled, and in some cases moving backward. Does that make a difference to the work of governing? Yes, according to decades of data from around the world. Women govern differently than men do in some important ways. They tend to be more collaborative and bipartisan. They push for far more policies meant to support women, children, social welfare and — when they’re in executive positions — national security. But these bills are also more likely to die, largely because of gender bias, research shows. Women in Congress sponsor and co-sponsor more bills than men do, and bring 9 percent more federal money to their districts, according to a study in the American Journal of Political Science. Those bills are more likely to benefit women and children or address issues like education, health and poverty. In Congress, for instance, women fought for women’s health coverage in the Affordable Care Act, sexual harassment rules in the military, the inclusion of women in medical trials, and child care vouchers in welfare overhaul. “All members of Congress have to follow their constituency, but because of their personal experiences either as women in the work force or as mothers, they might be inclined to legislate on some of these issues,” said Michele L. Swers, a professor of government at Georgetown University who studies gender and policy making.  In a new analysis of the 151,824 public bills introduced in the House between 1973 and 2014, to be published in print in Political Science Research and Methods, researchers found that women were significantly more likely than men to sponsor bills in areas like civil rights, health and education. Men were more likely to sponsor bills in agriculture, energy and macroeconomics. An analysis of floor speeches during the 106th Congress, by political scientists at the University of Iowa and Oklahoma State University, found that women spent more time talking about policy concerns like women’s health and family issues. Another study, of State of the State speechesfrom 2006 to 2008 published in State and Local Government Review, found that female governors devoted much more attention to social welfare issues than male governors did, even after controlling for political and situational factors. Women are less likely to vote for war or the death penalty. Women’s representation in legislatures is significantly correlated with the abolition of capital punishment, according to a study of 125 countries published in July by researchers at Sul Ross State University in Texas. A higher share of female legislators correlates with less military spending and less use of force in foreign policy, even after controlling for other explanations like partisanship, according to an analysis by researchers from Texas A&M University of data from 22 established democracies from 1970 to 2000. Yet when women are in executive positions, the opposite is true: They are more hawkish than men. The researchers said that could be in part because of a need to overcome stereotypes of women as weak. Margaret Thatcher, Golda Meir and Indira Gandhi, all of whom governed in conflicts, were described as governing like men.  
8. It can be inferred from the passage that _____________

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Nam wanted to know what time ...............

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Last week, China declared “mission accomplished” after landing a spacecraft, Chang’e-4, on the far side of the Moon. It was a remarkable endeavour. As the far side of the Moon never faces the Earth, mission control cannot communicate directly with the spacecraft, but only via an orbiting satellite. The terrain is more broken and cratered than the near side, so landing a craft is that much more difficult. Even Nasa was impressed: “a first for humanity and an impressive accomplishment!”. Yet mixed with admiration was trepidation. China, a latecomer to the space race, is now beginning to threaten the supremacy of America and Russia. But then Russia and America have long played their space exploration programmes for propaganda purposes. From the beginning, the space race was intimately bound up with the needs of the cold war. In 1957, the Soviet Union launched Sputnik, the first human craft to orbit the Earth. Four years later, Yuri Gagarin became the first man in space. Eight years later, on 21 July 1969, Neil Armstrong and Buzz Aldrin became the first humans to tread on the Moon. Their journey may have been fuelled in part by cold war desperation, but it was also an extraordinary triumph of knowledge and will, an act of the technological sublime. Once America was satisfied that the Soviet Union had been put in its place, space exploration became politically less important. As America downgraded its space ambitions, Chinese aspirations took flight. In 1992, the Chinese government approved the Shenzhou manned spaceflight programme. Eleven years later, Yang Liwei became the first Chinese astronaut in space. Fears about Chinese ambitions have been heightened by the changing context of the space race. During the cold war, America feared the Soviet Union, but was determined to thwart Moscow’s aims. Today, American apprehension stems from the worry that China’s emergence as the dominant global force cannot be checked, nor Beijing’s brutal despotism challenged. As liberal democracy frays in the west and authoritarian capitalism becomes entrenched in the east, self-doubt shapes US attitudes to China. Space exploration has long been fuelled by a mixture of humanistic dreams, technological leaps and tawdry politics. The Chang’e-4 mission is no different. How the space race will play out over the next decade, and what role China will adopt in global politics, remains uncertain. In the meantime, let us celebrate our new perspective of the dark side of the Moon.
8. Which of the following can be inferred from the passage?

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An important point to remember if you like spending time out in the open air is that the human head doesn’t work very well outdoors if it becomes too hot, cold or wet. That’s why a hat is a good investment, whenever you are planning to go out and about. Surprisingly, a single waterproof hat with a brim will do the (34)______ adequately in most conditions. In cold climates, the problem is that the head is (35)______ heat all the time. As much as fifty to sixty per cent of your body’s heat is lost through the head and neck, (36)______ on which scientist you believe. Clearly this heat loss needs to be prevented, but it’s important to remember that hats don’t actually keep you warm, they simply stop heat escaping. Just as important is the need to protect your neck from the effects of bright sunlight, and the brim of your hat will do this. If you prefer a baseball cap, (37)______ buying one that has a drop down ‘tail’ at the back to stop your neck getting sunburnt. And in wet weather (38)______, hats are often more practical than pooling up the hood of your waterproof coat because when you turn your head, the hat goes with you, whereas the hood usually does not.

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:
Carefully guiding a needle that's longer than his tiny fingers, a young boy in Pakistan stitches together the leather pieces of a soccer ball. He sits crouched in the corner of a hot, airless shed for 12 hours. For his long day's work, he will earn 60 cents.
The boy is one of more than 200 million children who work at hard, sometimes dangerous jobs all over the world. Child labor exists in two-thirds of the world's nations. From Indonesia to Guatemala, poor children as young as six are sent off to work. Often they are mistreated and punished for not working hard enough. Children mix the gunpowder for firecrackers in China and knot the threads for carpets in India, all for pennies a day. Sometimes they are sold as slaves.
In a speech to the Child Labor Coalition when he was U.S. Secretary of Labor, Robert Reich expressed gratitude for the organization's work to end abuse of child labor, "You turned up the heat, and you got results." He also congratulated Craig Kielburger, then 13, of Canada, who traveled the world for a year fighting for kids' rights. Craig believes kids can make a difference. He offers this advice, "Write letters to companies and government officials. Put pressure on leaders to make changes and to stop the misuse of children."
One solution to the child-labor problem in poor countries is education. "The future of these countries," Secretary Reich declared, "depends on a work force that is educated. We are prepared to help build schools."
Education has helped to make the world a brighter place for one youth, Aghan of India. When he was nine, Aghan was kidnapped from his home and sold to a carpet maker. Aghan's boss was very cruel. "I was always crying for my mother," he recalls. Aghan's dream was to learn to write so that he could send letters to his parents. Fortunately, a group that opposes child labor rescued Aghan from the factory. He was sent to a shelter in New Delhi where he worked hard to learn to write.

Child labor is most common in     .

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How fit are your teeth? Are you lazy about brushing them? Never fear: An inventor is on the case. An electric toothbrush senses how long and how well you brush, and it lets you track your performance on your phone. The Kolibree toothbrush was exhibited at the International Consumer Electronics Show in Las Vegas this week. It senses how it is moved and can send the information to an Android phone or iPhone via a Bluetooth wireless connection The toothbrush will be able to teach you to brush right (don’t forget the insides of the teeth!) and make sure you’re brushing long enough. “It’s kind of … like having a dentist actually watch your brushing on a day-to-day basis,” says Thomas Serval, the French inventor. The toothbrush will also be able to talk to other applications on your phone, so developers could, for instance, create a game controlled by your toothbrush. You could score points for beating monsters among your teeth. “We try to make it smart but also fun.” Serval says he was inspired by his experience as a father. He would come home from work and ask his kids if they had brushed their teeth. They said “yes,” but Serval would find their toothbrush heads dry. He decided he needed a brush that really told him how well his children brushed. The company says the Kolibree will go on sale this summer, for $99 to $199, developing on features. The U.S. is the first target market. Serval says that one day, it’ll be possible to replace the brush on the handle with a brushing unit that also has a camera. The camera can even examine holes in your teeth while you brush.
1. Which is one of the features of the Kolibree toothbrush?

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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.”
4. According to paragraph 3, what is NOT mentioned about the virus and its state of spreading?