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

 Before the nineteenth century, it was rarely to find organized systems of adult education

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In Africa, people celebrate with joy the birth of a new baby. The Pygmies would sing a birth-song to the child. In Kenya, the mother takes the baby strapped to her back into the thorn enclosure where the cattle is kept. There, her husband and the village elders wait to give the child his or her name. In West Africa, after the baby is eight days old, the mother takes the baby for it’s first walk in the big, wide world, and friends and family are invited to meet the new baby. In various African nations, they hold initiation ceremonies for groups of children instead of birthdays. When children reach a certain designated age, they learn the laws, beliefs, customs, songs and dances of their tribes. Some African tribes consider that children from nine to twelve are ready to be initiated into the grown up world. They may have to carry out several tests. Masai boys around thirteen years old to seventeen undergo a two stage initiation. The first stage lasts about three months. The boys leave their parents’ homes, paint their bodies white, and are taught how to become young warriors. At the end of this stage, they have their heads shaved and they are also circumcised. The second stage, the young warriors grow their hair long and live in a camp called a manyatta where they practice hunting the wild animals that might attack the Masai herds. This stage may last a few years. When they are ready, they will marry and become owners of large cattle herds like their fathers. The girls are initiated when they are fourteen or fifteen. They are taught by the older women about the duties of marriage and how to care for babies. Soon after that they are married and lead a life similar to that of their mothers  
5. The word “shaved” in paragraph 3 mostly means __________

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Herb Hamrol, 103, is among a handful of survivors of the 1906 San Francisco earthquake. Today marks the 100th anniversary of San Francisco’s great earthquake and fire. As the local newspaper Contra Costa Times observes, San Francisco has been “struggling with the difference between commemoration and celebration” leading up to the centennial. The city’s mayor, Gavin Newsom, has acknowledged that the 1906 earthquake was an “awkward” event to mark. Perhaps curiously, along with various exhibitions and lectures, more than one attempt has been made to capture the spirit of the anniversary in dance. The Walnut Creek Diablo Ballet company has produced “Earthquake”, which its creators stress is not just about death and falling buildings, but also the rebuilding of the city. Earlier this month, the San Francisco Ballet held a one-off solo dance performance to the beat of seismic data broadcast live from the Hayward fault. The information triggered sounds such as thunder claps and crashing waves while principal dancer Muriel Maffre improvised. It was “well conceived and beautiful”, the San Francisco Chronicle reported, although not quite as “leading edge” as claimed. At one stage there was a “haunted-house cacophony of screams and clinking chains and running water”, the paper’s critic said. There is a small, dwindling group of survivors from the quake, many of whom were just babies when it struck. A group of five of them - the oldest is 108 - recently met in San Francisco and happily gave interviews to journalists. They will attend a special commemoration breakfast today. One survivor, Della Bacchini, 101, who was one year old in 1906, told the San Francisco Examiner that it was important for the city’s residents to keep the history of the quake alive. "San Franciscans have a lot of guts," she said. “We’ve gone through earthquakes and fires, and the people have stuck together. Certainly, the city’s regeneration after 1906 was remarkable, with three-quarters of the lost buildings replaced within three years. A reinvented San Francisco was unveiled in 1915 with its Panama-Pacific International Exposition. In a commemorative lecture, Kenneth Starr, professor of history at the University of California, compared the compulsion to rebuild in 1906 with the plans to rebuild New Orleans after last year’s disaster: “Once they’re dreamed, once they’ve been there … they never disappear.  
7. The following statements are true, EXCEPT ________

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Aware of her disability, Anna makes great __________ to study the alphabet.

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Pick any day in the Piazza del Duomo in the Italian city of Pisa, and you will  undoubtedly spot a bunch of tourists posing for the same photo: hands outstretched towards the cathedral’s conspicuously tilting bell tower, as if they are supporting it with their sheer strength. The so-called Leaning Tower of Pisa is one of the most famous buildings in the world, although maybe not for the reasons its original architects would have wanted.  In 1173, construction began on a white marble bell tower for the cathedral complex in Pisa, located between the Arno and Serchio rivers in Tuscany, central Italy. By the time builders had finished the third of eight planned stories about five years later, the tower’s foundation had begun to settle unevenly on the ground beneath it, a dense mixture of clay, sand and shells. As a result, the structure had begun to tilt visibly toward the south. Shortly after that, war broke out between Pisa and Genoa, another Italian city-state, halting construction for nearly a century. This delay allowed the foundation to settle further, likely prevented the bell tower’s premature collapse.  When construction resumed, chief engineer Giovanni di Simone tried to compensate for the lean by adding extra masonry to the short side, but the additional weight caused the structure to tilt even further. The tower was officially completed around 1370, but its lean only increased over the next six centuries, becoming an integral part of the monument’s quirky appeal. Despite various attempts to reinforce it, Pisa’s tower continued to subside at a rate of some 0.05 inches per year, placing it in increasing danger of collapse. By 1990, it was leaning 5.5 degrees (or some 15 feet) from the perpendicular–the most extreme angle yet. That year, the monument was closed to visitors and the bells removed as engineers started extensive reparations to stabilize it. By siphoning earth from beneath and adding counterweights to the tower’s north end, they were able to reduce the lean to 13.5 feet, or 4.0 degrees from perpendicular. The straightening continued after the tower reopened in 2001, and in 2008 sensors showed the subsiding motion had stopped, after a total improvement of some 19 inches. Engineers now believe the Leaning Tower of Pisa will remain stable for some 200 years, barring an earthquake or other unpredictable disaster. 
5. According to paragraph 3, how was the result of Giovanni di Simone’s rectification?

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OPEC was established at a conference held in Baghdad Sept. 10–14, 1960, and was  formally constituted in January 1961 by five countries: Saudi Arabia, Iran, Iraq, Kuwait, and Venezuela. Members admitted afterward include Qatar (1961), Indonesia and Libya (1962), Abū Ẓabī (1967), Algeria (1969), Nigeria (1971), Ecuador (1973), and Angola (2007). The United Arab Emirates assumed Abū Ẓabī’s membership in the 1970s. Gabon, which had joined in 1975, withdrew in January 1995, but it had relatively insignificant oil reserves. Ecuador suspended its membership from OPEC from December 1992 until October 2007, while Indonesia suspended its membership beginning in January 2009.  OPEC’s headquarters, first located in Geneva, was moved to Vienna in 1965. OPEC members coordinate policies on oil prices, production, and related matters at semiannual and special meetings of the OPEC Conference. The Board of Governors, which is responsible for managing the organization, convening the Conference, and drawing up the annual budget, contains representatives appointed by each member country; its chair is elected to a one-year term by the Conference. OPEC also possesses a Secretariat, headed by a secretary – general appointed by the Conference for a three-year term; the Secretariat includes research and energy-studies divisions.  OPEC members collectively own about two-thirds of the world’s proven petroleum reserves and account for two-fifths of world oil production. Members differ in a variety of ways, including the size of oil reserves, geography, religion, and economic and political interests. Four members – Kuwait, Qatar, Saudi Arabia, and the United Arab Emirates – have very large per capita oil reserves; they also are relatively strong financially and thus have considerable flexibility in adjusting their production. Saudi Arabia, which has the largest reserves and a relatively small (but fast-growing) population, has traditionally played a dominant role in determining overall production and prices Because OPEC has been beset by numerous conflicts throughout its history, some experts have concluded that it is not a cartel – or at least not an effective one – and that it has little, if any, influence over the amount of oil produced or its price. Other experts believe that OPEC is an effective cartel, though it has not been equally effective at all times. The debate largely centers on semantics and the definition of what constitutes a cartel. Those who argue that OPEC is not a cartel emphasize the sovereignty of each member country, the inherent problems of coordinating price and production policies, and the tendency of countries to renege on prior agreements at ministerial meetings. Those who claim that OPEC is a cartel argue that production costs in the Persian Gulf are generally less than 10 percent of the price charged and that prices would decline toward those costs in the absence of coordination by OPEC.  The influence of individual OPEC members on the organization and on the oil market usually depends on their levels of reserves and production. Saudi Arabia, which controls about one-third of OPEC’s total oil reserves, plays a leading role in the organization. Other important members are Iran, Iraq, Kuwait, and the United Arab Emirates, whose combined reserves are significantly greater than those of Saudi Arabia. Kuwait, which has a very small population, has shown a willingness to cut production relative to the size of its reserves, whereas Iran and Iraq, both with large and growing populations, have generally produced at high levels relative to reserves. Revolutions and wars have impaired the ability of some OPEC members to maintain high levels of production. 
8. The word “impaired” in the last paragraph can best be replaced by _____

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A scientist said robots will be more (1) ____ than humans by 2029. The scientist’s  name is Ray Kurzweil. He works for Google as Director of Engineering. He is one of the world’s leading experts on artificial intelligence (A.I.). Mr Kurzweil believes computers will be able to learn from experiences, just like humans. He also thinks they will be able to (2) ____ jokes and stories, and even flirt. Kurzweil’s 2029 prediction is a lot sooner than many people thought. The scientist said that in 1999, many A.I. experts said it would be hundreds of years before a computer was more intelligent than a human. He said that it would not be (3) ____ before computer intelligence is one billion times more powerful than the human brain.  Mr Kurzweil joked that many years ago, people thought he was a little crazy for predicting computers would be as intelligent as humans. His thinking has stayed the same but everyone else has changed the way they think. He said: “My views are not radical any more. I’ve actually stayed consistent. It’s the rest of the world that’s changing its view.” He highlighted examples of (4) ____ -tech things we use, see or read about every day. These things make us believe that computers have intelligence. He said people think (5) ____ now: “Because the public has seen things like Siri (the iPhone’s voice recognition technology) where you talk to a computer, they’ve seen the Google self-driving cars.”

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Do you find the American education system to be confusing and different from the education system in your own country? Do you want to attend a university or a school in the USA? The American education system offers international students the most diverse set of options in the world. In fact, an international student who elects to take advantage of the American education system can pursue anything from nuclear science to film and dance. The possibilities are almost endless! The American education system requires that students complete 12 years of primary and secondary education prior to attending university or college. This may be accomplished either at public (or government-operated) schools, or at private schools. These 12 years of schooling (or their equivalent) may also be completed outside the USA, thus giving foreign students the opportunity to pursue the benefits of the American education system and obtain a quality American education. Perhaps one of the most impressive facts is the large number of presidents, prime ministers and leaders from other countries who have experienced the American education system and graduated from a university or school in the USA. In many fields and industries, the American education system offers the most cutting-edge, soughtafter programs at the world’s best schools. That is why graduating from an accredited American school and being exposed to the rigors of the American education system is an investment in your future. Whether you want to study at a USA university, a top college, or at an ESL, vocational or high school, a thorough understanding of how the American education system works is essential. Without a clear grasp of the system, an international student will find it difficult to make the right academic choices. The information provided in the Overview of the American education system section will help you develop that understanding. You can also search our list of Universities, colleges, community colleges, graduate schools, and boys and girls boarding schools. It is no surprise that the United States hosts more international students than any other country in the world!  
4. What is the writer’s advice in the passage?

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Although experts agree that traditional meetings are essential for making certain decisions and developing strategy, many employees view them as one of the most unnecessary parts of the workday. The result is not only hundreds of billions of wasted dollars, but the worsening of what psychologists call “meeting recovery syndrome”: time spent cooling off and regaining focus after a useless meeting.  It’s isn’t anything novel that workers feel fatigued after a meeting, but only in recent decades have scientists deemed the condition worthy of further investigation. Meeting recovery syndrome (MRS) is most easily understood as a slow replenishment of our limited mental resources. When an employee sits through an ineffective meeting their brain power is essentially being drained away, says Joseph A. Allen, a professor at the University of Utah. If they last too long, fail to engage employees or turn into lectures with little to no personal interactions, meetings will significantly diminish employees’ psychological stamina. Taking time to recover a must, but doing so comes at the expense of productivity.  As humans, when we transition from one task to another – such as from sitting in a meeting to doing normal work – it takes an effortful cognitive switch. We must make a big mental effort to stop the previous task and then expend significant mental energy to move on to the other. Some can bounce back from horrible meetings rather quickly, while others carry their fatigue until the end of the workday. It’s even worse when a worker has several meetings that are separated by only 30 minutes.  While no counter-MRS measures have been tested, Allen says one trick that might work is for employees to identify things or locations that quickly change their mood from negative to positive. As simple as it sounds, finding a personal happy place, going there and then coming straight back to work might be the key to reducing recovery time. Another solution is to ask ourselves if our meetings are even necessary in the first place. If all that’s on the agenda is a quickly catch-up, or some non-urgent information sharing, it may better for managers to send an e-mail to his or her subordinates instead. Most important, however, if for organizations to awaken to the concept of meetings being flexible, says Allen. We have to get rid of the acceptance of meetings as sites of pain, when they should be places of gain.” Allen says. 
4. What does Joseph A. Allen suggest employees do to quickly regain mental stamina?

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In all the debate about conservation of natural landscapes, we must not forget that the 19th century also saw the development of interest in the cultural past. Although archaeology was around 100 years old at this point, at least in the Old World, it was largely an exercise in treasure hunting - digging up the treasures of the past as curiosities for museums or for the private collections of those who funded the dig. Changes in attitudes and law throughout the 19th century meant that monuments and artefacts were becoming part of the study of the past, no longer merely trinkets and curiosities, but indicators of a culture’s development and identity. Modern archaeology would not arrive until the 20th century and the concept of an archaeological landscape is younger still. The first laws to protect and conserve cultural heritage came into place in the late 19th and early 20th centuries in the developed countries. In the US, the first such law was the Antiquities Act in 1906 which gave the office of president the power to set aside areas of land as protected cultural assets, known as “National Monuments”. This law was in place until 1979 when it was replaced with the Archaeological Resources Protection Act but several other laws came into place before then that  required archaeologists to label and give proper contexts to monuments and artefacts. There was also a global movement to protect by law and provide resources and funds for monuments that were nationally important, but also those deemed significant to human civilization as a whole. Founded in 1945, has many responsibilities, one of the most important as far as archaeological conservation is concerned is the World Heritage List. The list began in 1975 as a recognition of globally important sites. The first 12 added on that first day included: L’Anse Aux Meadows in Canada, The Galapagos Islands, Quito in Ecuador, Krakow, and Mesa Verde National Park in the US. Today, there are over 1,000 cultural monuments and natural landscapes on this list. In the 21st century, it is common for countries to have laws in place to protect monuments, sites, and landscapes of cultural or historical importance and governmentestablished charities or government departments assigned to their management, upkeep or conservation. The threats to them and their conservation go beyond the issues of the 19th century (plunder and theft)
1. What does the passage mainly discuss?

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New technology helped cities grow. Elevated trains carried passengers over (1) ____ streets. In 1887, the first electric streetcar system opened in Richmond, Virginia. Ten years later, the nation’s first electric subway trains began running beneath the streets of Boston. Public transportation gave (2) ____ to suburbs, living areas on the outskirts of a city. People no longer had to live in cities to work in cities. Steel bridges also accelerated suburban growth. The Brooklyn Bridge, completed in 1883, (3) ____ the city center in Manhattan to outlying Brooklyn. As a result, New York City was able to spread out to house its growing population. Cities began to expand upward as well as outward. In 1885, architects in Chicago constructed the first 10-story building. People called it a “skyscraper” because its top seemed to touch the sky. By 1900, (4) ____ skyscrapers up to 30 stories high towered over cities. Electric elevators whisked office workers to the upper floors. As cities grew outward from their old downtown sections, living patterns changed. Many cities took on a similar shape. Poor families crowded (5) ____ the oldest sections at the city’s center. Middle-class people lived farther out in row houses or new apartment buildings. The rich built fine homes on the outskirts of the city.

Find mistake:
We remember that last time he wore those jeans was at Lucy’s birthday party.

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Co Loa was the capital of Early Ngo Dynasty, ___________ in fact it only existed with the proper function of a capital in 6 years under Ngo Quyen’s reign.

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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! 
1. Which best serves as the title for the passage?

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Living things include both the visible world of animals and plants as well as the invisible world of (1) __________ and viruses. On a basic level, we can say that life is ordered. Organisms have an enormously complex organization. Life can also “work”. Living creatures can take in energy from the environment. This energy, in the form of food, is changed to maintain (2) __________ processes and for survival. Life grows and develops. This means more than just getting larger in size. Living organisms also have the ability to rebuild and repair themselves when injured. Life can reproduce. Life can only come from other living creatures. Life can respond. Think about the last time you accidentally stubbed your toe. (3 )____________ instantly, you moved back in pain. Finally, life can adapt and respond to the demands placed on it by the environment. There are three basic types of adaptations that can occur in higher organisms. Reversible changes occur as a response to changes in the environment. Let’s say you live near sea level and you travel to a mountainous area. You may begin to experience difficulty breathing and an increase in heart rate (4) __________ the change in height. These signs of sickness go away when you go back down to sea level. Body- related changes happen as a result of (5) ___________ changes in the environment. Using the previous example, if you were to stay in the mountainous area for a long time, you would notice that your heart rate would begin to slow down and you would begin to breath normally. These changes are also reversible

Rewrite the sentence:
He likes to listen to pop music than to watch TV after school.

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For nearly all of human history, there haven’t been that many of us. Around the year zero, Earth’s population is estimated to have been 190 million. A thousand years later, it was probably around 250 million. Then the Industrial Revolution happened, and human population went into overdrive. It took hundreds of thousands of years for humans to hit the 1 billion mark, in 1800. We added the next billion by 1928. In 1960, we hit 3 billion. In 1975, 4 billion. That sounds like the route to an overpopulation apocalypse, right? To many midcentury demographers, futurists, and science fiction writers, it certainly predicted one. Extending the timeline, they saw a nightmarish future ahead for humanity: human civilizations constantly on the brink of starvation, desperately crowded under horrendous conditions, draconian population control laws imposed worldwide. Stanford biologist Paul Ehrlich wrote in his best-selling book, “In the 1970’s, hundreds of millions of people will starve to death” because of overpopulation. None of that ever came to pass. The world we live in now, despite approaching a population of nearly 8 billion, looks almost nothing like the one doomsayers were anticipating. Starting in the 19th century in Britain and reaching most of the world by the end of the 20th century, birthrates plummeted — mostly because of women’s education and access to contraception, not draconian population laws. In wealthy societies where women have opportunities outside the home, the average family size is small; in fact, it’s below replacement level. Called the demographic transition, it is one of the most important phenomena for understanding trends in global development.  There’s still significant debate among population researchers about the extent of the sea change in population trends. Researchers disagree on whether global populations are currently on track to start declining by midcentury. There’s also disagreement on what the ideal global population figure would be, or whether it’s morally acceptable to aim for such a figure. While academic research seeks to nail down these questions, it’s important to be clear what is consensus among researchers. Our projections around population are used to make global health and development policy. They’re critical for planning, especially about climate change. Fears of overpopulation sometimes turn into hostility to immigrants, those who choose to have large families, and countries in an earlier stage of their population transition. Having an informed conversation about population is crucial if we are to get humanity’s future right.  
5. The word “it” in paragraph 3 refers to _____

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The climate crisis is poised to deliver a severe blow to America’s most threatened animals, with a new study finding that almost every species considered endangered is vulnerable in some way to global heating. Of the 459 animal species listed as endangered by the US government, researchers found that all but one, or 99.8%, have characteristics that will make it difficult for them to adapt to rising temperatures. The California condor, once close to being completely wiped out, faces increased risk of contamination in hotter conditions. Key deer, found only in the Florida Keys, face losing habitat to the rising seas. Whole classes of animals including amphibians, mollusks and arthropods are sensitive to the greatest number of climate-related threats, such as changes in water quality, shifting seasons and harmful invasive species that move in as temperatures climb. Mammals, such as the north Atlantic right whale and Florida panther, also face increased hardships, albeit on fewer fronts than amphibians, mollusks and arthropods.  Despite the overwhelming peril faced by America’s endangered species due to the climate crisis, the report, published in Nature Climate Change, found a patchy response from the US government. Federal agencies consider just 64% of endangered species to be threatened by the climate crisis, while just 18% of listed species have protection plans in place. Astrid Caldas, a study co-author and a climate scientist at the Union of Concerned Scientists said: “While agencies have increasingly listed climate change as a growing threat to species whose survival is already precarious, many have not translated this concern into tangible actions, meaning a significant protection gap still exists.” Nearly half of Australian species are threatened by the climate crisis, researchers have found. A spokesman for the US Fish and Wildlife Service, which oversees the endangered species list, said that while a species may be sensitive to changes in the climate, this sensitivity may not be so severe as to warrant being put on the list. “Our process for determining this looks at five factors: threats to a species’ habitat, overutilization, disease or predation, existing regulatory mechanisms, and other factors that may affect its continued existence,” he said. “Through this scientifically rigorous process we examine and account for the effects of climate change.  
4. According to paragraph 3, which word best describe the reaction of the government to the problem?

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Light-emitting diodes (LEDs) are now considered the future of lighting due to a lower energy requirement to run, a lower monthly price tag, and a longer life than traditional incandescent light bulbs. Nick Holonyak, an American scientist at General Electric, accidently invented the red LED light while trying to create a laser in the early 1960s. As with other inventors, the principle that some semiconductors glowed when an electric current was applied had been known since the early 1900s, but Holonyak was the first to patent it for use as a light fixture. Within a few years, yellow and green LEDs were added to the mix and used in several applications including indicator lights, calculator displays, and traffic lights, according to the DOE. The blue LED was created in the early 1990s by Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, a group of Japanese and American scientists, and for which they won the 2014 Nobel Prize in Physics. The blue LED allowed scientists to create white LED light bulbs by coating the diodes with phosphor Today, lighting choices have expanded and people can choose different types of light bulbs, including compact fluorescent (CFL) bulbs work by heating a gas that produces ultraviolet light and LED bulbs. Several lighting companies are pushing the boundaries of what light bulbs can do, including Phillips and Stack. Phillips is one of several companies that have created wireless light bulbs that can be controlled via smartphone app. The Phillips Hue uses LED technology that can quickly be turned on or off or dimmed by a flick on a smart phone screen and can also be programmed. The higher-end Hue light bulbs can even be set to a large range of colors (only about sixteen million) and synced with music, movies, and video games. Stack, begun by engineers from Tesla and NASA, developed a smart light bulb using LED technology with a wide range of functions. It can automatically sense the ambient lighting and adjust as needed, it turns off and on via motion sensor when someone enters the room, can be used as a wake up alert, and even adjusts color throughout the day to fit with human’s natural circadian cycles and patterns of natural light. The light bulbs also have a built-in learning program that adapts to inputs given by residents over time. And all of these functions can be programmed or monitored from any smart phone or tablet. It is estimated that Stack smart light bulbs can use about sixty percent less energy than a typical LED light bulb and lasts between twenty and thirty thousand hours depending on the model . These light bulbs are compatible (or soon will be) with many of the options for turning an entire home into a smart home including usage with Amazon Alexa, Google Home, and Apple HomeKit.
5. According to paragraph 5, what can be done with the higher-end Hue light bulbs?

Find oppostite:
Students are advised to tune out distractions and focus on study.

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

 Modern airplanes are able to fly very highly because they have pressurized cabins