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

The Mayan Indians lived in Mexico for thousand of years before the Spanish arrived in the 1500s
 

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

Rewrite the sentence:
“I am sorry but I won’t do the extra work,” Carol said.

Read the following passage and choose the best answer (A, B, C, D):
Birds are even more disrupted by their noisy neighbours than had been thought  previously, researchers have found. And human activities could be preventing birds from reproducing and even developing normal social behaviour and keeping the peace.  A study by Queen’s University Belfast found that when European robins were subjected to human produced noises their behaviour changed. Background noise appeared to mask the communication of crucial information between birds. While aggressive communication is common and birds respond to it, interference through noise can lead to the birds mistaking the signals.  Birds can end up in situations all too familiar to humans. “The birds receive incomplete information on their opponent’s intent and do not appropriately adjust their response,” explained Arnott. “Where song is disguised by background noise, in some cases the male ends up fighting more vigorously than he should, but at other times gives in too easily.”Arnott said the purpose of birdsong was twofold – to attract mates and defend territory. Birds already face an array of human-made dangers, from pesticides and intensive farming to shooting and poisoning. But noise had often been overlooked, the paper in Biology Letters found. A spokesperson for the RSPB said: “Everyone is becoming increasingly concerned that nature is in crisis in the UK, with one in 10 of our wildlife species at threat of extinction. Many of our birds’ populations are already facing a serious crisis as a result of habitat loss, climate change and other human activities. This report is a good reminder that the way we live and our lifestyle has an impact on our natural world, and that we need to protect our natural world if we want to let nature sing.”  For birds, the extra burden of noise pollution adds to extraordinary decline in species, including among once common birds, in recent decades due to such activities as agricultural practice and pesticide use. In the experiment the team used playbacks of robin song to stimulate responses from birds who were territory holders. Simple or complex songs were used in either the presence or absence of noise. The researchers found that song complexity  was used as a signal of aggressive intent; birds demonstrated higher aggressive intent towards complex rather than simple song. This process was disrupted by the presence of added noise.
1. Which best serves as the title for the passage?

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

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Hardcover and paperback are two types of books and bookbinding processes. A hardcover book is also called a hardback or hardbound. On the other hand, a paperback also goes by the names softback and soft cover. Paperbacks can be further classified as trade paperbacks and mass-market paperbacks. Paperback book, as its name implies, has a soft card or a thick paper cover over the pages. This type of covering is less heavy but prone to folding, bending, and wrinkles with use and over time. Hardcover books are characterized with a thick and rigid covering. This covering allows protection for the pages and makes the book durable and usable for a long time. Oftentimes, a hardcover book has a dust that protects the books from dust and other wear and tear. Some books are even made durable by using leather or calfskin as a book covering. In terms of manufacturing and purchasing books, hardcover books are more expensive due to the materials and processes. Pages of hardcover books are acid-free paper. This type of paper allows preservation of the ink and is ideal for books in use and preserving them for a long time. On the other hand, paperbacks use cheap paper, usually newsprint. The reason for this is to lower production costs and being readily made available for the masses. The paper in a hardcover book is usually stitched together before being glued, stapled, or sewn to the book’s spine. Due to the stitches, a hardcover book can have signatures, a place where the binding threads are visible. Meanwhile, a paperback book’s pages are glued together and glued again to the spine. This makes the pages loose or separated while being in use. Hardcover books are often applied to academic books, references books, commercial, and bestsellers that have enjoyed financial success. Other books in the hardcover version are books of collectible value. Publishers often release a hardcover version of the book to show investment so that they can project a high return of investment. This is a large contrast regarding paperbacks. Paperback books are done for new or succeeding editions, reprinting of books or books with little profit margin. Publishers use the paperback editions to stretch the profit for the book. The first release or first edition of a literary work is purposefully done as a hardcover book followed by paperback versions.
7. The following statements are true, EXCEPT ________

Choose the best answer:
He’s so brilliant and he can do anything - ……….

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Sophia is a humanoid robot developed by Hong Kong-based company Hanson Robotics. She has been designed to learn and adapt to human behavior and work with humans, and has been interviewed around the world. In October 2017, she became a Saudi Arabian citizen, the first robot to receive citizenship of a country. According to herself, Sophia was activated on April 19, 2015. She is modeled after actress Audrey Hepbum,and is known for her human-like appearance and behavior compared to previous robotic variants. According to manufacturer, David Hanson, Sophia has artificial intelligence, visual data processing and facial recognition. Sophia also imitates human gestures and facial expressions and is able to answer certain questions and to make simple conversations on predefined topics (e.g. on the weather). The robot uses voice recognition technology from Alphabet Inc. (parent company of Google) and is designed to get smarter over time. Sophia’s intelligence software is designed by SingularityNET. The AI program analyses conversations and extracts data that allows her to improve responses in the future. It is conceptually similar to the computer program ELIZA, which was one of the first attempts at simulating a human conversation. Hanson designed Sophia to be a suitable companion for the elderly at nursing homes, or to help crowds at large events or parks. He hopes that she can ultimately interact with other humans sufficiently to gain social skills. Sophia has been interviewed in the same manner as a human, striking up conversations with hosts. Some replies have been nonsensical, while others have been impressive, such as lengthy discussions with Charlie Rose on 60 Minutes. In a piece for CNBC, when the interviewer expressed concerns about robot behavior, Sophia joked that he had “been reading too much Elon Musk, and watching too many Hollywood movies”. Musk tweeted that Sophia could watch The Godfather and suggested “What’s the worst that could happen?”. On October 11, 2017, Sophia was introduced to the United Nations with a brief conversation with the United Nations Deputy Secretary-General, Amina J. Mohammed. On October 25, at the Future Investment Summit in Riyadh, she was granted Saudi Arabian citizenship, becoming the first robot ever to have a nationality. This attracted controversy as some commentators wondered if this implied that Sophia could vote or marry, or whether a deliberate system shutdown could be considered murder. Social media users used Sophia’s citizenship to criticize Saudi Arabia’s human rights record. 
2. Paragraph 2 mainly discusses_________

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Three women, none of whom we _______ before, _______ out of the hall.

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:
Four West Indian geckos, with human assistance, have recently entered the United States. The yellowheaded gecko, the ashy gecko, the reef gecko, and the ocellated gecko are presently inhabiting the tropical areas of the Keys and the tip of southern Florida. The Mediterranean gecko also arrived along the Gulf coast some time ago, via the West Indies. The only other geckos in the United States live in the Southwest. In extreme southern California, the leaf-gingered gecko lives

in dry, rocky country and scampers over boulders at night, hiding by day in crevices. It has a slender, tapered tail and stalks insects by raising itself high on its legs, cocking its head, and twitching its tail nervously before leaping on its prey. In courtship, the tail is also waved by the male as he approaches the female.
Although most lizards are excellent climbers, the geckos are able to walk on smooth surfaces with the help of unique clinging devices under the toes. Also, the undersides of most geckos have pads of large scales, each of which bear microscopic hairs with hundreds of branches having minute, blunt ends that press against the surface that the gecko is on, enabling the gecko to cling to almost any surface. Like other lizards, geckos have the ability to shed their tails if attacked by an enemy. They stump heels and a new tail is grown in approximately the same shape as the original. Unlike most lizards, most geckos have no moveable eyelids. The nocturnal geckos have vertical pupils, which contract in bright light. All geckos, except several New Zealand species, lay eggs. The eggs have a tough, white shell and are laid under stones, behind window shutters or under bark.

According to the passage, the banded gecko .

Read the following passage and choose the best answer (A, B, C, D):
To really figure out what a CV is, we first have to talk about what CV means. The  letters CV stand (1) ____ curriculum vitae which is Latin for “course of life.” When used in a job seeking context, a CV (also sometimes referred to as just a vita) is a detailed accounting of not only a person’s past history of education, experiences and (2) ____ but also related accomplishments and is generally used when an individual is looking for a job. (3) ____, a CV is a thorough and comprehensive document, detailing not only your education and work history, but also your achievements, awards, any honors you’ve been conferred and any and all of your publications.  A resume, on the other hand, is not so long. Ideally a good solid resume is about one page in length and can be submitted for almost any type of job (4) ____ the market. When you type up a resume, you’re usually just covering your work and educational history. You might include certain professional affiliations and possibly highlight (5) ____ major awards that relate to the job you’re applying for, but it’s usually a concise document. Short and sweet

Read the following passage and choose the best answer (A, B, C, D):
We’re not surprised if you haven’t been following the recent developments in AI all  that closely because, for the most part, it’s seemed like nothing exciting has happened for quite a long time. Sci-fi dreams about computer powered best friends aside, AI for the general public has come to mean reasonably responsive and well-programmed computer assistance rather than independent thinking machines. Concepts like ‘smart’ chatbots somehow seem to pull us further from the Star Trek or Heinlinian dream of fully sentient and intuitive computers while many products and services that claim to integrate AI seem to be nothing more than a fast way to analyze large amounts of data.  In fact, the last time most of us heard something hopeful about AI was when Deep Blue beat the world Chess champion, but what ever came of that AI? Surely it hasn’t used that incredible logical power to take over the world or begin making friends, so what do we even care?  While practical applications for specifically built AI are growing, the tradition of training your AI programming skills on classic strategy games has existed since the 1950s when a computer was programmed to play and was able to win a game of tic-tac-toe. Since then a large variety of games and custom-built AIs have been tested against each other to the great entertainment of experts in the field and curious nerds like us who care about that sort of thing. The real difference is not what they’re programmed for but how they are programmed to start with and, in fact, this is also what most profoundly distinguishes AlphaGo from its older-generation relative, the Chess champion DeepBlue. 
4. The word “it” in paragraph 2 refers to _______

Read the following passage and choose the best answer (A, B, C, D):
Can a performance go viral? Ben Platt’s should. As the title character in Dear Evan Hansen, the new musical from Benj Pasek and Justin Paul, he offers acting so precise yet so painfully lucid that it should overwhelm the operating systems by which most contemporary musicals operate. Platt’s gestures, his expressions, his phrasing, even his vocal range – which is impressive but tends to thin out toward the top notes – all combine to communicate the fretfulness, uncertainty and timorous goodness that define his character. He plays Evan, a friendless high school senior terrified of life, the universe, everything. His harried single mother, Heidi, (Rachel Bay Jones) tells him, “You can’t succeed if you never try.” Evan nods, but you can that he believes more strongly in the corollary: “If you don’t try, you can’t fail.” A therapist has instructed him to write pep-talk letters to himself. On the first day of school, one of them falls into the hands of Connor Murphy (Mike Faist), another outcast with drug problems and a look a peer describes as “school shooter chic”. When Connor kills himself, his parents find the letter and mistakenly believe that Evan was a friend to their son. At first this attention panics Evan, but he soon accepts the role and even briefly becomes an internet sensation. Often he is tempted to tell Connor’s family the truth, but he fears disappointing them and sacrificing his newfound confidence Watching Dear Evan Hansen, one often thinks of Next to Normal, another Second Stage show about a mentally distressed protagonist. But with its tuneful pop score and teenage protagonist, Dear Evan Hansen is a gentler affair, even as it takes occasional pains not to oversentimentalize the material. When Evan presents a surprisingly rosy picture of her brother, his sister Zoe (Laura Dreyfuss) sings, “Don’t say it wasn’t true/ That you were not the monster/ That I knew.” Near the play’s end, Platt positively glistens with sweat and spit and tears. Yet one never has the sense of an actor deliberately winding himself up to deliver a visceral performance. There’s obvious care taken in the way he offers Evan’s cringing smile, his swallowed laugh, his habit of pulling at his clothes as though searching for someone to hold onto. But all of these details feel lived, organic, unrehearsed. And Platt’s ability to convey emotion through song is simply superb and often deeply heartrending.  
6. According to paragraph 4, what feeling does the performance of Ben Platt bring to the audience?

Choose the best answer:
"I have never been to Russia. I think I shall go there next year.” said Bill.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:
It’s often said that we team things at the wrong time. University students frequently do the minimum of work because they’re crazy about a good social life instead. Children often scream before their piano practice 5 because it’s so boring. They have to be given gold stars and medals to be persuaded to swim, or have to be bribed to take exams. But the story is different when you’re older.
Over the years, I’ve done my share of adult learning. At 30, I went to a college and did courses in History and English. It was an amazing experience. For starters, I was paying, so there was no reason to be late - I was the one frowning and drumming my fingers if the tutor was late, not the other way round. Indeed, if I could persuade him to linger for an extra five minutes, it was a bonus, not a nuisance. I wasn’t frightened to ask questions, and homework was a pleasure not a pain. When I passed an exam, I had a big meal, not for my parents or my teachers. The satisfaction I got was entirely personal.
Some people fear going back to school because they worry that their brains have got rusty. But the joy is that, although some parts have rusted up, your brain has learnt all kinds of other things since you were young. It has learnt to think independently and flexibly and is much better at relating one thing to another. What you lose in the rust department, you gain in the maturity department.
In some ways, age is a positive plus. For instance, when you’re older, you get less frustrated. Experience has told you that, if you’re calm and simply do something carefully again and again, eventually you’ll get the hang of it. The confidence you have in other areas - from being able to drive a car, perhaps - means that if you can’t, say, build a chair instantly, you don’t, like a child, want to destroy your first pathetic attempts. Maturity tells you that you will, with application, eventually get there.
I hated piano lessons at school, but I was good at music. And coming back to it, with a teacher who could explain why certain exercises were useful and with musical concepts that, at the age of ten. I could never grasp, was magical. Initially, I did feel a bit strange, thumping out a piece that I’d played for my school exams, with just as little comprehension of what the composer intended as I’d had all those years before. But soon, complex emotions that I never knew poured out from my fingers, and suddenly I could understand why practice makes perfect.

The word “they” in paragraph 1 refers to     .

It used to be that people would drink coffee or tea in the morning to pick them up and get them going for the day. Then cola drinks hit the market. With lots of caffeine and sugar, these beverages soon became the pick-me-up of choice for many adults and teenagers. Now drink companies are putting out so-called "energy drinks." These beverages have the specific aim of giving tired consumers more energy.

One example of a popular energy drink is Red Bull. The company that puts out this beverage has stated in interviews that Red Bull is not a thirst quencher. Nor is it meant to be a fluid replacement drink for athletes. Instead, the beverage is meant to revitalize a tired consumer's body and mind. In order to do this, the makers of Red Bull, and other energy drinks, typically add vitamins and certain chemicals to their beverages. The added chemicals are like chemicals that the body naturally produces for energy. The vitamins, chemicals, caffeine, and sugar found in these beverages all seem like a sure bet to give a person energy.

Health professionals are not so sure, though. For one thing, there is not enough evidence to show that all of the vitamins added to energy drinks actually raise a person's energy level. Another problem is that there are so many things in the beverages. Nobody knows for sure how all of the ingredients in energy drinks work together.

Dr. Brent Bauer, one of the directors at the Mayo Clinic in the US, cautions people about believing all the claims energy drinks make. He says, —It is plausible if you put all these things together, you  will get a good result. || However, Dr. Bauer adds the mix of ingredients could also have a negative impact on the body. —We just don't know at this point,|| he says.

(Source: —Reading Challenge 2||, Casey Malarcher & Andrea Janzen, Compass Publishing)

Which of the following is NOT true according to the passage?

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

Application for admission to the Graduate School at this university must be made on forms provided by the Director of Admission. An applicant whose undergraduate work was done at another institution should request that two copies of undergraduate transcripts and degrees be sent directly to the Dean of the Graduate School. Both the application and the transcripts must be on file at least one month prior to the registration date, and must be accompanied by a non-refundable ten-dollar check or money order to cover the cost of processing the application. Students who have already been admitted to the Graduate School but were not enrolled during the previous semester should reapply for admission using a special short form available in the office of the Graduate School. It is not necessary for students who have previously been denied admission to resubmit transcripts; however, new application forms must accompany all requests for reconsideration. Applications should be submitted at least eight weeks in advance of the session in which the student wishes to enroll. Students whose applications are received after the deadline may be considered for admission as non-degree students, and may enroll for six credit hours. Non-degree status must be changed prior to the completion of the first semester of study, however. An undergraduate student of this university who has senior status and is within ten credit hours of completing all requirements for graduation may register for graduate work with the recommendation of the chairperson of the department and the approval of the Dean of the Graduate School.

What is the author's main point?

Read the following passage and choose the best answer (A, B, C, D):
In the last five decades or so, the media and its influence on the societies, has grown (1)_______ with the advance of technology. First there was the telegraph and the post offices, then the radio, the newspaper, magazines, television and now the internet and the new media including palmtops, cell phones etc. There are positive and negative influences of mass media, which we must understand as a responsible person of a society. Before (2)___________ the influence of mass media on society it is imperative to explain the three basic functions of mass media; they are providing news/information, entertainment and education. The first and foremost function of the media in a society is to provide news and information to the masses, that is why the present era is some time termed as the information age (3)__________. People need news/information for various reasons, on one hand it can be used to socialize and on the other to make decisions and formulate opinions. Entertainment would be the other function of the mass media (4)______ it is mostly used by the masses to amuse them in present day hectic environment. Educating the masses about their rights, moral, social and religious obligations is another important function of mass media, which needs no emphasis. In present era of (5)__________ , majority of people in the society depends on information and communication to remain connected with the world and do our daily activities like work, entertainment, health care, education, socialization, travelling and anything else that we have to do

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

John’s wisdom teeth were troubling him, so he went to a dental surgeon to see about having them pull

Read the following passage and choose the best answer (A, B, C, D):
There have never been so many people living in cities in quake zones because the worse the damage can be from a big quake, bringing fires, tsunamis, and the loss of life, property, and maybe an entire city. We understand how earthquakes happen but not exactly where or when they will occur. Until recently, quakes seemed to occur at random. In Japan, government research is now showing that quakes can be predicted. At the Earthquake Research Institute, University of Tokyo, Koshun Yamaoka says earthquakes do follow a pattern—pressure builds in a zone and must be released. But a colleague, Naoyuki Kato, adds that laboratory experiments indicate that a fault slips a little before it breaks. If this is true, predictions can be made based on the detection of slips. Research in the U.S. may support Kato’s theory. In Parkfield, California earthquakes occur about every 22 years on the San Andreas fault. In the 1980s, scientists drilled into the fault and set up equipment to record activity to look for warning signs. When an earthquake hit again, it was years off schedule. At first the event seemed random but scientists drilled deeper. By 2005 they reached the bottom of the fault, two miles down, and found something. Data from two quakes reported in 2008 show there were two “slips’—places where the plates widened—before the fault line broke and the quakes occurred. We are learning more about these destructive events every day. In the future we may be able to track earthquakes and design an early-warning system. So if the next great earthquake does happen in Tokai, about 100 miles southwest of Tokyo, as some scientists think, the citizens of Tokai may have advance warning
1. What is the main idea of the passage?