Read the following passage and choose the best answer (A, B, C, D):
For centuries, historians and archaeologists have puzzled over the many mysteries of  Stonehenge, the prehistoric monument that took Neolithic builders an estimated 1,500 years to erect. Its construction is so baffling because, scientists have traced the bluestones that make up its inner ring all the way to the Preseli Hills in Wales, some 200 miles from where Stonehenge sits on Salisbury Plain.  If the facts surrounding the architects and construction of Stonehenge remain shadowy at best, the purpose of the arresting monument is even more of a mystery. While historians agree that it was a place of great importance for over 1,000 years, we may never know what drew early Britons to Salisbury Plain and inspired them to continue developing it. There is strong archaeological evidence that Stonehenge was used as a burial site, at least for part of its long history, but most scholars believe it served other functions as well-either as a ceremonial site, a religious pilgrimage destination, a final resting place for royalty or a memorial erected to honor and perhaps spiritually connect with distant ancestors.  In the 1960s, the astronomer Gerald Hawkins suggested that the cluster of megalithic stones operated as an astronomical calendar, with different points corresponding to astrological phenomena such as solstices, equinoxes and eclipses. While his theory has received quite a bit of attention over the years, critics maintain that Stonehenge’s builders probably lacked the knowledge necessary to predict such events or that England’s dense cloud cover would have obscured their view of the skies. More recently, signs of illness and injury in the human remains unearthed at Stonehenge led a group of British archaeologists to speculate that it was considered a place of healing, perhaps because bluestones were thought to have curative powers.
4. The word “them” in paragraph 2 refers to _______

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Before the mid-nineteenth century, people in the United States ate most foods only in season. Drying, smoking, and salting could preserve meat for a short time, but the availability of fresh meat, like that of fresh milk, was very limited; there was no way to prevent spoilage. But in 1810 a French inventor named Nicolas Appert developed the cooking-and-sealing process of canning. And in the 1850’s an American named Gail Borden developed a means of condensing and preserving milk. Canned goods and condensed milk became more common during the 1860’s, but supplies remained low because cans had to be made by hand. By 1880, however, inventors had fashioned stamping and soldering machines that mass- produced cans from tinplate. Suddenly all kinds of food could be preserved and bought at all times of the year. Other trends and inventions had also helped make it possible for Americans to vary their daily diets. Growing urban populations created demand that encouraged fruit and vegetable farmers to raise more produce. Railroad refrigerator cars enabled growers and meat packers to ship perishables great distances and to preserve them for longer periods. Thus, by the 1890’s, northern city dwellers could enjoy southern and western strawberries, grapes, and tomatoes, previously available for a month at most, for up to six months of the year. In addition, increased use of iceboxes enabled families to store perishables. An easy means of producing ice commercially had been invented in the 1870’s, and by 1900 the nation had more than two thousand commercial ice plants, most of which made home deliveries. The icebox became a fixture in most homes and remained so until the mechanized refrigerator replaced it in the 1920’s and 1930’s. Almost everyone now had a more diversified diet. Some people continued to eat mainly foods that were heavy in starches or carbohydrates, and not everyone could afford meat. Nevertheless, many families could take advantage of previously unavailable fruits, vegetables, and dairy products to achieve more varied fare.
8. The author implies that in the 1920’s and 1930’s home deliveries of ice: 

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Alzheimer's disease impairs a person's ability to recall memories, both distant and as a few hours before. Although there is no yet a cure for the illness, there may be hope for a cure with a protein called nerve growth factor. The protein is produced by nerve cells in the same region of the brain where Alzheimer's occurs. Based on this relationship, scientists from the University of Lund in Sweden and the University of California at San Diego designed an experiment to test whether doses of nerve growth factor could reverse the effects of memory loss caused by Alzheimer's. Using a group of rats with impaired memory, the scientists gave half of the rats doses of nerve growth factor while giving the other half a blood protein as a placebo, thus creating a control group. At the end of the four-week test, the rats given the nerve growth factor performed equally to rats with normal memory abilities. While the experiment do not show that nerve growth factor can stop the general process of deterioration caused by Alzheimer's, they do show potential as a means to slowing the process significantly.
4. Which of the following is closest in meaning to the word "region"?

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Why has Holmes continued to (1) _________________ generation after generation when other fictional detectives of the Victorian period are forgotten? One can break the answers down into a mix of elements. But first it will be useful to summarize the life of Holmes’s (2)____________. Doyle was born in Edinburgh in 1859, one of nine children of an alcoholic Irish artist who was consigned, in later life, to a lunatic asylum. Young Arthur Doyle was educated at the fee-paying Jesuit college, Stony Hurst. (3)___________ 16 he spent a year in Austria before enrolling at Edinburgh University’s medical school. In 1880 he spent seven months in the Arctic as ship’s doctor on a whaler. The following year he graduated with a (4)__________ degree, and made another trip to Africa before setting up, less adventurously, in medical practice near Portsmouth, in July 1882. His income had reached £300 a year by 1885, enabling him to marry the sister of one of his patients. Doyle had long written on the side and in 1886 he played around with stories (5)____________ on an ‘amateur private detec-tive’, called ‘J. Sherrinford Holmes’. The outcome was the Sherlock Holmes novella, A Study in Scarlet (1887). No top-drawer publisher would take it and it was eventually serialized as a Christmas giveaway in a magazine and then as what was called a ‘shilling shocker’ – pulp fiction for the masses

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The field of 3-D printing comes with a new set of legal questions hospitals using the  technology will need to consider, said Bruce Kline, a technology licensing manager who oversees patents for new technology developed at Mayo Clinic. For starters, he said the STL file printers use are a lot like MP3 music files, in that they can be protected under copyright and require licensing to use. Copyright violations can occur if a purchased STL anatomical model file for rare disease is illegally shared with another institution that did not purchase the file from the vendor that created the file.  Under the law, if a device has a functional use it falls under patent law. If it is not functional, it falls under copyright law. Kline said most medical 3-D printing for educational models and complex anatomy evaluation currently falls under copyright. But, he said that will rapidly change in the coming years as customizable 3-D printable medical devices see wider use.  Additive manufacturing (AM) allows the creation of patient-specific devices at the point of care. Kline said an interesting fact is that these devices are FDA 510(k)-exempt if produced by a hospital instead of a medical device vendor. He said this blurs the lines between traditional vendor relationships, since the hospital can now become the manufacturer. However, if a hospital makes a device, it also becomes liable for it. He advised that it might be better for a commercial vendor to make the device for the hospital so the vendor assumes the liability of the device. Custom-made medical devices are also exempt under FDA regulations, Kline said. So, if a physician creates or modifies a device to meet the clinical needs of a specific patient’s anatomy, he said it is acceptable to use under current FDA rules. This may leave the door wide open for use of 3-D printed devices that are customized for each patient using their own 3-D imaging datasets.  It is possible printable device files may become available in the next few years to customize and print on demand. However, Kline said it will be much more difficult to enforce patents on these types of devices. He explained if someone makes one or two devices, there is no economical way for the creator of those device files to go after the user/maker of of unlicensed copies of the device to claim lost profits.
1. What is the main topic of the passage?

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A (1) ______ teacher can reach thousands of students in an online course, opening up a world of knowledge to anyone with an internet connection. This limitless reach also offers substantial benefits for school districts that need to save money, by reducing the number of teachers. (2) __________, in high schools and colleges, there is mounting evidence that the growth of online education is hurting a critical group: the less proficient students (3) _______ are precisely those most in need of skilled classroom teachers. Online courses can be broken down into several categories, and some are more effective than others. In “blended” courses, for example, students don’t do their work only online: They also spend time in a classroom with a flesh-and-blood teacher. Research suggests that students — at nearly all levels of achievement — do just as well in these blended classes as they do in traditional classrooms. In this model, online resources supplement traditional instruction but don’t replace it. In the fully online model, on the other hand, a student may never be in the same room with an instructor. This category is the main problem. It is where less proficient students tend to (4) _________ trouble. After all, taking a class without a teacher requires high levels of self-motivation, self-regulation and organization. Yet, in high schools across the country, students who are struggling in (5) ________classrooms are increasingly steered into online courses

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Like high schools, American colleges are sometimes criticized for discarding requires courses and offering too many electives. In the mid-1980s, the Association of American Colleges issued a report that (1) ____________ teaching a body of common knowledge to all college students. A similar report, “Involvement in Learning,” issued by the National Institute of Education, concluded that the college curriculum had become “excessively work-related”. The report also (2) __________ that college education may no longer be developing in students “the shared values and knowledge” that traditionally bind Americans together. These reports coincided (3) ____________ a trend away from the liberal arts. Instead, students were choosing major fields designed to prepare them for specific jobs. In 1992, 51 percent of the bachelor’s degrees were conferred in the fields of business and management, communications, computer and sciences, education, engineering, and health sciences. This trend raises questions that apply to the educational philosophy of all industrialized countries. In an age of technological breakthroughs and highly (4) _______________ disciplines, is there still a need for the generalist with a broad background and well-developed abilities to reason and communicate? And if the answer to that question is yes, should society take steps to encourage its colleges and universities to produce more such generalists? Like their (5) ____________ in other countries, American educators continue to debate these questions

Choose the best answer:
The scientist said the earth ............... the sun.

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

Wooden in summer grows more slowly and is darker

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

rather catchy. When a few humpbacks from the Indian Ocean strayed into the Pacific, some of the whales they met there quickly changed their tunes – singing the new whales’ songs within three short years. Some scientists are even tempted to speculate that a universal music awaits discovery.

Which of the following concepts is defined in 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:
In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc... This may not be true in some other countries, however. An American professor discovered this difference while teaching a class in a Brazilian university. The two-hour class was scheduled to begin at 10 a.m, and end at 12 a.m. On the first day, when the professor arrived on time, no one was in the classroom. Many students came after 11 a.m. Although all of the students greeted the professor as they arrived, few apologised for their lateness. Were these students being rude? He decided to study the students’ behavior.
In American university, students are expected to arrive at the appointed hour. On the other hand, in Brazil, neither the teacher nor the students always arrive at the appointed hour. Classes not only begin at the scheduled time in the United States, but they also end at the scheduled time. In the Brazilian class, only a few students left the class at noon, many remained past 12:30 to discuss the class and ask more questions. While arriving late may not be important in Brazil, neither is staying late.
The explanation for these differences is complicated. People from Brazilian and North American cultures have different feelings about lateness. In Brazil, the students believe that a person who usually arrives late is probably more successful than a person who is always on time. In fact, Brazilians expect a person with status or prestige to arrive late, while in the United States, lateness is usually considered to be disrespectful and unacceptable. Consequently, if a Brazilian is late for an appointment with a North America, the American may misinterpret the reason for the lateness and become angry.
As a result for his study, the professor learned that the Brazilian students were not being disrespectful to him. Instead, they were simply behaving the appropriate way for a Brazilian student in Brazil. Eventually, the professor was able to adapt his own behavior to feel comfortable in the new culture.

All of these following sentences are true for the first day of the professor in Brazil EXCEPT     

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By Celsi’s account, Alison has changed her mind a dozen times. Now she was utterly torn. She wanted to (1)_________ her lifelong dream of climbing to K2, adding it to Everest to become the only British woman (2)______the world’s two highest summits. And she (3) _______wanted to be back with her children, Tom, six and Kate, four. But early in that morning, while having a light English breakfast, Alison reopened that burning question once again, (4)__________endless cups of coffee with Celsi as she turned it over and over in her mind. “It was a very emotional thing for her,” says Celsi. “She really went through a lot of things, filling for divorce, raising the kids all by herself and changing a lot of jobs”. Finally, just 15 minutes before the porter was due to depart, she (5) ______ Celsi she had decided to stay, reasoning that, since she had been away for so long, one more week wouldn’t matter. “She said it was logical to give the weather a chance to clear.”

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Sandwiches make a delicious snack any time. They are a common sight a picnics and  teas. Interestingly enough, the sandwich is (1) _______ invention of an 18th -century English Earl called John Montagu. Montagu was addicted to card games. He would play these games with his friends for long stretches of time. Often, he even found it too (2) _______ to stop his games for meals.  One day, in the middle of a game, Montagu was served a meal of sliced meat with bread. At the time, Montagu was playing the game that (3) _______ its players to cover cards one on top of another. As Montagu looked at both the game and his food, an idea came to his mind. “I can do the same with my food as well,” he thought. He took a slice of bread, placed a (4)______ of meat on it and covered that with another slice of bread. Montagu was very pleased with his invention because it allowed him to play cards with one hand and eat his meal with the other.  Montagu’s friends quickly (5) _______ to his idea and they named the new invention after him. As Montagu’s full title was “the Earl of Sandwich”, the new invention became known as a “sandwich”.

Read the following passage and choose the best answer (A, B, C, D):
Nature photographer Joel Sartore is passionate about endangered species. He uses his  camera to make people aware of environmental problems. They tell the stories of animals that may disappear unless we work fast to save them.  Sartore’s latest project is called Photo Ark. The goal of the project is to make a photographic record of the world’s biodiversity. As Sartore says, “For many of Earth’s creatures, time is running out.”  When asked how he became interested in saving endangered species, Joel said “When I was a child, I read about Martha, the very last passenger pigeon. Martha died in 1914. I was shocked. In the past, there were 5 billion passenger pigeons – probably more than any other bird. But here was the last one, and there was no way to save it. How did we let this happen? I couldn’t understand it. I still feel the same way. I want to prevent this from ever happening again.” Photography is the best way to show problems to the world. It gets people to care about the problem. It’s not enough to just show pretty animals in a beautiful landscape. Now, we must show the threats to these animals as well. The good news is that there are many ways to publish stories and photographs on environmental issues. Self-publishing on the Web is one way to do this. Even nonprofessional photographers can help to make us aware of these problems
1. The best title of the passage can be “_________”.

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Coal, oil and gas get more than $370bn a year in support, compared with $100bn for renewables, the International Institute for Sustainable Development (IISD) report found. Just 10-30% of the fossil fuel subsidies would pay for a global transition to clean energy, the IISD said. Ending fossil fuel subsidies has long been seen as vital to tackling the climate emergency, with the G20 nations pledging in 2009 to phase them out, but progress has been limited. The new analysis shows how redirecting some of the fossil fuel subsidies could decisively tip the balance in favour of green energy, making it the cheapest electricity available and instigating a rapid global rollout. The transition from polluting fossil fuels to clean energy is already under way. Annual investment in renewables has been greater than that in fossil fuel electricity generation since 2008 and new renewable capacity has exceeded fossil fuel power each year since 2014. But progress is slow compared with the urgency required, said Bridle. “There is no question that renewables can power the energy system,” he said. “The question now is can we transit quickly enough away from fuels like coal, and subsidy reform is a very obvious step towards that.  Reform of fossil fuel subsidies could have a significant impact on global heating. An earlier IISD study of 20 countries with large fossil fuel subsidies found that a 30% swap to renewables would lead to emissions reductions of between 11% and 18%. Most experts define fossil fuel subsidies as financial or tax support for those buying fuel or the companies producing it. The IMF also includes the cost of the damage fossil fuel burning causes to climate and health, leading to an estimate of $5.2tn of fossil fuel subsidies in 2017, or $10m a minute. Ending the subsidies would cut global emissions by about a quarter, the IMF estimates, and halve the number of early deaths from fossil fuel air pollution. Bridle said funding fossil fuel subsidies was “madness”, but said ending them could cause short-term price rises and political difficulties, as the benefits of lower costs in the future and reduced air pollution are less obvious. “There are political problems but it is worth persevering because the prize is so big,” he said. “You have to bring people along with you.” Gençsü said governments must ensure that the most vulnerable people were not adversely affected by changes. 
1. Which best serves as the title for the passage?

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Every summer, when the results of university entrance exam come out, many newspaper stories are published about students who are top-scorers across the country. Most portray students as hard-working, studious, smart and, generally, from low-income families. They are often considered heroes or heroines by their families, communes, villages and communities. And they symbolise the efforts made to lift them, and their relatives, out of poverty. The students are often too poor to attend any extra-classes, which make their achievements more illustrious and more newsworthy. While everyone should applaud the students for their admirable efforts, putting too much emphasis on success generates some difficult questions. If other students look up to them as models, of course it’s great. However, in a way, it contributes to society’s attitude that getting into university is the only way to succeed. For those who fail, their lives are over. It should be noted that about 1.3 million high school students take part in the annual university entrance exams and only about 300,000 of them pass. What’s about the hundreds of thousands who fail? Should we demand more stories about those who fail the exam but succeed in life or about those who quit university education at some level and do something else unconventional? “I personally think that it’s not about you scoring top in an entrance exam or get even into Harvard. It’s about what you do for the rest of your life,” said Tran Nguyen Le Van, 29. He is the founder of a website, vexere.com, that passengers can use to book bus tickets online and receive tickets via SMS. His business also arranges online tickets via mobile phones and email. Van dropped out of his MBA at the Thunderbird School of Global Management in Arizona in the United States. His story has caught the attention of many newspapers and he believes more coverage should be given to the youngsters who can be role-models in the start-up community. Getting into university, even with honours, is just the beginning. "We applaud them and their efforts and obviously that can give them motivation to do better in life. However, success requires more than just scores," Van said. Van once told a newspaper that his inspiration also came from among the world’s most famous drop-outs, such as Mark Zuckerberg of Facebook or Bill Gates who also dropped out of Harvard University. Alarming statistics about unemployment continues to plague us. As many as 162,000 people with some kind of degree cannot find work, according to Labour Ministry’s statistics this month. An emphasis on getting into university does not inspire students who want to try alternative options. At the same time, the Ministry of Education and Training is still pondering on how to reform our exam system, which emphasises theories, but offers little to develop critical thinking or practice. Vu Thi Phuong Anh, former head of the Centre for Education Testing and Quality Assessment at Viet Nam National University in HCM City said the media should also monitor student successes after graduation. She agreed there were many success stories about young people, but added that it was imbalanced if students taking unconventional paths were not also encouraged. Viet Nam is, more than ever, in desperate need of those who think outside the box. Time for us to recognise talent, no matter where it comes from or how.
4. The author described Tran Nguyen Le Van in the third passage as ________________

Choose the best answer:
No longer ……….their housework as they used 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 questions.

   Family life in the United States is changing. Thirty or forty years ago, the wife was called a "housewife". She cleaned, cooked, and cared for the children. The husband earned the money for the family. He was usually out working all day. He came home tired in the evening, so he did not do much housework. And he did not see the children very much, except on weekends.

   These days, however, more and more women work outside the home. They cannot stay with the children all day. They, too, come home tired in the evening. They do not want to spend the evening cooking dinner and cleaning up. They do not have time to clean the house and do the laundry. So who is going to do the housework now? Who is going to take care of the children?

   Many families solve the problem of housework by sharing it. In these families, the husband and wife agree to do different jobs around the house, or they take turns doing each job. For example, the husband always cooks dinner and the wife always does the laundry. Or the wife cooks dinner on some nights and the husband cooks dinner on other nights.

   Then there is a question of the children. In the past, many families got help with child care from grandparents. Now families usually do not live near their relatives. The grandparents often are too far away to help in a regular way. More often, parents have to pay for child care help. The help may be a babysister or a day-care center. The problem with this kind of help is the high cost. It is possible only for couples with jobs that pay well.

   Parents may get another kind of help from the companies they work for. Many companies now let people with children work part-time. That way, parents can spend more time with their children. Some husbands may even stop working for a while to stay with the children. For these men there is a new word: They are called "househusband". In the United States more ans more men are becoming househusband every year.

   These changes in the home mean changes in the family. Fathers can learn to understand their children better, and the children can get to know their fathers better. Husbands and wives may also find changes in their marriage. They, too, may have a better understanding of each other.

The word “laundry” in paragraph 2 is closest in meaning to ___________.

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Taking piano lessons and solving math puzzles on a computer significantly improve specific math skills of elementary schoolchildren, according to a new study. The results, (1)______ were published in the journal Neurological Research, are the latest in a series that links musical training to the development of higher brain functions. Researchers worked with 135 second-grade students at a school in Los Angeles after (2)______ a pilot study with 102 students. Children that were given four months of piano training as well as time playing (3)______ newly designed computer software scored 27 percent higher on math and fraction tests than other children. Piano instruction is thought to enhance the brain's "hard wiring" for spatial-temporal reasoning, or the ability to visualise and transform objects in space and time, says Professor Gordon Shaw, who led the study. At the same time, the computer game allows children to solve geometric and math puzzles that boost their ability to (4)______ shapes in their mind. The findings are significant (5)______ a grasp of proportional math and fractions is a prerequisite to math at higher levels, and children who do not master these areas of math cannot understand more advanced math that is critical to high-tech fields.

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Perfectly smart adults feel intimidated by numbers and aren’t ashamed to say, “I hate math.” The new book “Math Art” could help change that by making the dreaded topic relevant and accessible to naturalists, artsy types, the philosophically inclined, and committed calculators alike. It illuminates an old lesson your math teachers probably tried to convey when you were a kid: Math dominates our lives even while we try with all our might to ignore it. In Math Art, released in April, science writer Ornes examines creative works inspired by math. It’s an aesthetically pleasing book with a delightfully tactile cover and satisfyingly thick and glossy pages that make it as fun to flip through as a fashion magazine. Chapters are dedicated to different concepts like pi, the golden ratio, equations in nature, and hyperbolic geometry. All of which may sound scary to the uninitiated but gain appeal when illustrated through sculpture, crochet, and painting. As Ornes explains in the introduction, math art isn’t new. Since ancient times, humans have visualized math in creative works. He argues that what is new is the mutual recognition that mathematicians and artists now show each other, increasingly gathering together at events dedicated to the intersection of aesthetics and numbers. “This is art by way of math and math by way of art, beauty at the crossroads,” Ornes writes.  His exploration begins with pi, the irrational mathematical constant 3.14159, plus some, ad infinitum. Pi, the ratio of the circumference of a circle to its diameter, represents mystery itself. Because the sequence never repeats, pi hints at the vastness of the universe. “It speaks to a world without bounds, since its digits go on forever,” Ornes explains. Pi is used for calculations in math and physics, and employed by math artist John Sims to make music, videos, drawings, paintings, quilts, clothing, and stories. Sims created and taught a math curriculum for students at the Ringling College of Art and Design in Sarasota, Florida, and has spent much of his career at the intersection of math and creativity. In Ornes’ book, he explains how he’s also used this fascination to connect with other people he might not otherwise meet, such as the Amish quilters who joined him to make pi quilts with each colored panel representing a number in the mathematical sequence.  
3. The word “might” in paragraph 1 is closest in meaning to _______

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Rachel Carson was born in 1907 in Springdale, Pennsylvania. She studied biology in college and zoology at Johns Hopkins University, where she received her master's degree in 1933. In 1936, she was hired by the US Fish and wildlife service, where she worked most of her life. Carson's first book, Under the Sea Wind, was published in 1941. It received excellent reviews, but sales were poor until it was reissued in 1952. In that year, she published The Sea Around Us, which provided a fascinating look beneath the ocean's surface, emphasizing human history as well as geology and marine biology. Her language had a poetic quality. Carson consulted no less than 1,000 printed sources. She had voluminous correspondence and frequent discussions with experts in the field. However, she always realized the limitations of her non-technical readers. In 1962, Carson published Silence Spring, a book that sparked considerable controversy. It proved how much harm was done by the uncontrolled, reckless use of insecticides. She detailed how they poison the food supply of animals, kill birds, and contaminate human food. At that time, spokes men for the chemical industry mounted personal attacks against Carson and issued propaganda to indicate that her findings were flawed. However, her work was vindicated by a 1963 report of the President's Science Advisory Committee.
4. It can be inferred from the passage that in 1952, Carson's book Under the Sea Wind...........