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mmlu
Question: Pasta is the world's favorite food. Asurveytaken in 17 countriesconfirmedthat pasta is what people like to eat most. Not only is pasta the number one food in its home country -Italy, but is alsoenjoyedin faraway places like the Philippines, Mexico andSouth Africa. Pasta has become popular, for one thing, beca...
D
mmlu
Question: Kitty is a little black-and-brown Australian dog. It's not a particularly bright dog. While Dad can make my sister and me afraid just by the tone of his voice, I have never heard him raise his voice at Kitty. In fact, one look from Kitty at the biscuit tin is enough to send my dad flying to get him a snack. W...
D
mmlu
Question: Have you ever wondered when people will make up their minds to become friends? Dr. Leon answered the question in his book, "During their first four minutes together! Whenever you meet someone in a social situation, remember to focus your undivided attention on him for four minutes. That would change a lot of ...
C
mmlu
Question: Scientists from China, Sweden and the United Stated have developed a high-producing rice that can reduce methane emission , a major greenhouse gas blamed for global warming, from rice fields, according to a paper published on the latest issue of Nature. By inserting a barley gene into rice, Sun Chuanxin and ...
C
mmlu
Question: When John Milton , writer of "Paradise Lost" ,entered Cambridge University, in 1625, he was already skilled in Latin after seven years of studying it as his second language at St. Paul's School,prefix = st1 /London. Like all English boys who prepared for college in grammar schools ,he had learned not only to ...
A
mmlu
Question: Sing the Language You're Learning How can you remember a song from your childhood to this day? Why do your teachers use songs to teach you English? It seems there is a scientific reason for this. Researchers are now studying the relationship between music and remembering a foreign language. They find that rem...
A
sciq
Question: Why wouldn't a teakettle have an aluminum handle? Choices: A. it is magnetic B. it absorbs light C. it isn't washable D. it conducts heat
D
mmlu
Question: My grandfather had a small farm where he raised beef and some grain for feed. He also worked diligently as a factory laborer and country pastor. He was a good neighbor and well-respected for honoring his word. When harvest time came, he'd piece together his old one-row corn picker and oil it up for the season...
D
mmlu
Question: The poorer mental function seen among alcoholics,many of whom also regularly smoke cigarettes,may be partly due to the long term effects of nicotine ,new research suggests. "People who are also smokers are at a much higher risk," Dr.Jennifer M.Glass of the University of Michigan's Addiction Research Center s...
A
mmlu
Question: The English test will be removed from China's college entrance exam by 2020, according to the Ministry of Education. The national college entrance exam, known as the "Gaokao" has been used to evaluate Chinese students for three decades. The Ministry of Education has worked out a plan for reforming exams and e...
C
arc_challenge
Question: In a tug-of-war game, balanced forces are best represented when both teams cause the flag to Choices: A. stay in the middle. B. fall to the ground. C. move slowly in one direction. D. be pulled quickly in one direction.
A
mmlu
Question: Steve Jobs, co-founder and former CEO of US technology giant Apple, has died at the age of 56. Mr Jobs had announced he was suffering from cancer in 2004. Apple said he had been "the source of countless innovations that enrich and improve all of our lives" and had made the world "immeasurably better". Tribute...
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mmlu
Question: I spent my last vacation trekking in Nepal, a small country in the Himalaya Mountains of Asia. On a trekking vacation, you walk for long distances through the mountains. There are very few roads in Nepal, so trekking is the best way to travel. It's best if you hire a guide . The guides know the best paths t...
B
mmlu
Question: Finding the Real You Psychometric testing--personality testing--has been very popular nowadays as studies show their results to be three times more accurate in predicting your job performance. These tests are now included in almost all graduate recruitment and are widely used in the selection of managers. T...
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sciq
Question: What fibres are seen in some vertebrates that twitch at rates far faster than any human muscle? Choices: A. slow twitch fibres B. fast glycolytic fibres C. skeletal muscle fibers D. fast oxidative fibres
C
mmlu
Question: This summer I will leave the junior high school where I have been for three years. I am generally considered to be a careful and polite boy now. However, five years ago, I was a little bit bossy . I often fought with other boys and sometimes I even fought with my elder sister. When I saw Superman on TV for th...
B
mmlu
Question: Enjoy a museum visit with your class! Available Programs: Art Tells a Story: By looking at the subject matter and by drawing from personal experiences, students can find the story in some works of art. ( All grades) Learning to Look: An interactive tour that explores a variety of art using storytelling, mo...
B
mmlu
Question: Have you eaten too much over the holidays? You should try fidgeting for a while. Those around you might not like it, but scratching (moving your nails against a part of your body) and twitching (moving suddenly and quickly when you don't want to) is an important way of burning up calories . American research...
A
mmlu
Question: The aim of students who come to school is to study.But study requires a right way, or you waste either the time or the money. The following are the ways for studying. The best time for reading is morning, because in the morning, the air is fresh and the mind is clear. For that reason, we can get good results....
D
mmlu
Question: Long ago in a small village, there was a place. It is famous for the House of 1000 Mirrors. A small, happy little dog learned of this place and decided to visit. When he arrived, he jumped happily up the stairs to the doorway of the house. He looked through the doorway with his ears lifted high and his tai...
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mmlu
Question: Bananas are one of the world' s most important food crops. They are also one of the most valuable exports. Bananas do not grow from seeds. Instead, they grow from existing plants. Bananas are threatened by disease because all the plants on a farm are copies of each other. They all share the same genetic weakn...
B
mmlu
Question: Advertisements HOUSE FOR SALE Comfortable family home with a large garden of the north side of the town. Three bedrooms, living room, kitchen, bathroom. Offer over $35,000. JOIN OUR FOOTBALL TEAM Boys and girls want to play in local football team. Aged 9~13. Meet in Green Park on Fridays at 3 Pm. ROOM FOR R...
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mmlu
Question: A new study finds that the animal known as man's best friend can also be a good friend to the heart. Researchers in California say they have found that even just a short visit with a dog helped ease the worries of heart patients. The study divided the patients into three groups. In Group A, a dog and a person...
B
mmlu
Question: Mr. Lee was in bed and was trying to go to sleep when he heard the bell ring. He turned on the light and looked at his clock. It was twelve o'clock. "Who can it be at this time of night?" He thought. He decided to go and find out. So he got of bed, put on his dressing gown and went to the door. When he opened...
B
mmlu
Question: To discipline means to teach. To be well disciplined is to have learned to live in accordance with the sensible rules and regulations that society has set up for the behavior of its members. Unless the child learns from each disciplinary situation how better to govern his conduct, effective discipline has not...
D
mmlu
Question: Hey there, So you're about to spend four years of your life and tens of thousands of dollars of your parents' money, and all you really know about college is that all of your friends are going. Do you ever stop to wonder why you're going? Relax. You're making the right decision. First of all, you'll discover ...
C
mmlu
Question: According to the British "Daily Mail" reported on May 22nd, the United States of America "Forbes" magazine recently released the 2013 annual "most powerful women list". German Chancellor(,) Angela Merkel for three consecutive years reelected top. There are 9 Chinese including Chinese first lady--Peng Liyuan....
C
mmlu
Question: Have you ever looked toward the sky on a fall day and witnessed a group of migrating birds? If so, you probably noted the V-shaped formation of the birds or the birds flying in a ball-like formation. Why do birds fly this way? Many theories have been developed to explain the formation patterns of different ty...
A
mmlu
Question: Which form of travel causes the most pollution? Choices: A. bicycling B. skiiing C. driving D. walking
C
mmlu
Question: "Ok," I said to my daughter as she bent over her afternoon bowl of rice. "What's going on with you and your friend J.?" J. is the leader of a group of third-graders at her camp--a position Lucy herself occupied the previous summer. Now _ , and every day at snack time, she tells me all about it, while I offer ...
A
mmlu
Question: What's the most important thing for you to have in your life? Somebody mentions hard-work, others suggest knowledge, love and luck. If you arrange the 26 English letters alphabetically and use numbers to represent each of them, for example, 1 for a, 2 for b, 3 for c..., you can change an English word into a n...
C
mmlu
Question: About 12 years ago, I began making a series of dolls called "Wee Mountain Folk." At first, I made them from cloth but then began using a kind of polymer clay called cernit. The cloth dolls were beautiful, but it was impossible to get the level of detail I can get with clay. First, I use wire to build the shap...
D
mmlu
Question: Two-year-old hero Ye Chengfeng saved most of his family from a deadly gas leak . As his grandfather lay dead, the child woke up his grandmother and saved five other family members from deaths. More and more British school kids use their mobile phones to cheat in exams. They use them to send messages to get t...
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mmlu
Question: Mrs Brown is very fat . "Don't eat meat or cakes,"her doctor says to her. "I'm going to stop her eating them, doctor,"her husband says. The next morning, Mrs Brown makes a nice cake, and her husband eats half of it. After he goes out, Mrs Brown cuts a very small piece of the cake and eats it. It is very ...
B
arc_challenge
Question: Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples? Choices: A. They have different dimensions. B. They have different boiling points. C. They are made up of a different type...
A
mmlu
Question: BEIJING----China will further open its financial sector in "an active and safe" way, the country's central bank vowed on Friday. "China will gradually broaden the chance for the participation of foreign capital in the domestic financial market," said the People's Bank of China in a report. "We will strengthen...
B
mmlu
Question: Can we make animals work for us? Some scientists think that one day we can teach animals to do a lot of things for people. They say that in a film or on TV you may see elephants, monkeys, dogs or some other animals doing a lot of things. If you watch carefully, you may find those animals are always given a li...
C
mmlu
Question: Get the Emergency World Radio FREE The U.S. Department of Homeland Security advises that every American home have an emergency radio. Every home needs an emergency radio in the event of hurricanes, tornadoes, earthquakes, electric power outages and even terrorist attacks. Be Prepared in Any Situation This D...
A
mmlu
Question: My dad and I both love music. He taught me how to play some pop songs on the piano and he is teaching me to play the drums and sing. He even creates custom tracks for me to help me perform my best! -- Samantha, age 11, California, USA My dad encourages me to do my best in school so I can achieve my dream of...
D
mmlu
Question: Which of these elements is found in the greatest amount in organisms? Choices: A. carbon B. iron C. lead D. neon
A
mmlu
Question: One day, a poor man, who had only one piece of bread to eat, was walking past a restaurant. There was a large pot of soup on the table. The poor man held his bread over the soup, so the steam from the soup went into the bread, and gave it a good smell. Then he ate the bread. The restaurant owner was very angr...
B
mmlu
Question: Just one bite of cake that is made with eggs is enough to make John feel very sick. Susan gets a terrible rash whenever she eats anything containing seafood, and David nearly died when he first ate a cookie that included peanuts. David had trouble breathing after he ate the cookie, but his mother knew what to...
A
mmlu
Question: The students of Class Three are going hiking for their fieldtrip. Hiking is good for people's health. Many hikers like to hike in the countryside, forest and mountains. Just walking for fun is the first kind of hiking. Many people like to hike in the parks or just on the sidewalks. A hike can take a few hou...
D
sciq
Question: When the oval window vibrates, it causes what else to vibrate as well? Choices: A. hammer and anvil B. cilia C. the cochlea D. timpani
C
arc_easy
Question: According to the Big Bang Theory, which element most likely formed first? Choices: A. carbon dioxide B. hydrogen C. oxygen D. nitrogen
B
mmlu
Question: It was several years since Adolf Hitler came into power in Germany. And now his army was marching into some parts of Europe. He must be in the prime of his career. One day Hitler went to an exhibition where the works of school children were on show. He seemed to have great interest in the exhibits--inventions...
B
mmlu
Question: Look at the boy. His English name is Mike Smith. His Chinese name is Li Hai. He is from England. He's twelve years old. My name is Hao Gang. Tom is my English name. I'm from Shanghai. I'm thirteen. Mike and I are good friends. We are in Grade Seven. I am in Class 3 and he is in Class 5. Today is Thursday. We ...
D
mmlu
Question: Some students think it difficult to learn English well. That's because they don't find the right way. I think reading is very important for students. The more you read, the better you'll understand. Reading is helpful to listening, speaking and writing. If you often read English aloud, you'll improve your lis...
B
mmlu
Question: For Canadians, backpacking Europe is a special ceremony signifying a new life stage. Unlike package tours, backpacking is a struggle, full of discovery and chance connections. It is about focusing on something different from our own lives and losing ourselves in a new world, if only for a moment. Well, that's...
B
mmlu
Question: Kendall Ciesemier says she's like any other schoolgirl. She keeps herself busy with school, friends and family. There is one thing, though. Not many other 14-year-olds can say they run a successful charity helping children in Africa. In three years, the eighth-grader from the US has raised $100,000 for Africa...
D
mmlu
Question: I love to tell the story about how I met my best friend-Tiger. We met at the school fair . Each year, all the fourth-grade classes hold a school fair. Everyone in the fourth grade works at the fair. Some sell ice cream, drinks and snacks, others take care of the little children who ride the horses. I got the...
C
sciq
Question: Planets are held by the force of gravity in elliptical orbits around what? Choices: A. jupitor B. mars C. sun D. earth
C
mmlu
Question: Which property of water can cause a rock to break apart? Choices: A. Water boiling at 100°C. B. Water losing energy slowly. C. Water expanding as it freezes. D. Water having a high surface tension.
C
mmlu
Question: The Secret World of Disneyland The cat It is not easy to keep the park clean. Every night after the closing time, about 200 cats will come into the park. Because of them, there are few pests in the park. They are nice workers in the park. The light In the 1950s, Walt Disney had an apartment in the park. When...
B
mmlu
Question: Language is a major problem for the European Union (EU). The agreement or treaty which created the organization that eventually became the EU, the Treaty of Rome, stated that each country's language must be treated equally. The original six countries had only three languages between them: French, German and...
A
mmlu
Question: The American Relay for Life is a life-changing event that gives everyone in communities across the globe a chance to celebrate the lives of people who have battled cancer, remember loved ones lost, and fight back against the disease. At Relay, teams of people camp out at a local high school, park, or an open ...
C
mmlu
Question: One night when my wife was preparing dinner, our little son took a piece of paper to her which read: For washing the car .........................................................$5.00 For making my own bed this week ....................................... $1.00 Going to the provision shop .......................
C
mmlu
Question: China's admiration of outstanding scholars has turned the well-preserved childhood home of TuYouyou,the Chinese pharmacologist who won this year's Nobel Prize in physiology or Medicine,into a popular tourist destination. Since it was announced on Monday that 84-year-old Tu had become the first Chinese citiz...
B
mmlu
Question: A primary school bus driver stopped the bus in a gas station in Ohio because he had to use the bathroom. Instead of turning off the engine and taking the key with him, the driver left the bus running. And he forgot to set the brake because he was in a hurry. "It was cold outside, and I didn't want the kid...
C
mmlu
Question: Most English people have three names: a first name, a middle name and a family name . For example, my full name is Ann Allan Green. Green is my family name. Ann and Allan are my given names. People don't use their middle names very much.So we can say Ann Green. We can say Miss Green or Mrs. Green. But we can'...
C
sciq
Question: What is the average number of individuals per unit of area or volume called? Choices: A. population structure B. population density C. crowdedness D. population count
B
mmlu
Question: Many years ago, there was an old man who had four sons. He wanted his sons to learn not to judge things too quickly. So he told them to go and look at a pear tree. It was far away from his home. The first son went in winter, the second in spring, the third in summer, and the youngest son in autumn. When the ...
C
mmlu
Question: Which is true? Choices: A. the equator has winter and summer at the same time B. humans on the equator celebrate Christmas in May C. the equator is always cold D. humans on the equator can go either north or south to change season
D
mmlu
Question: If you want to become a better reader, here are four important points to remember about rate or speed of reading: First, knowing why you are reading and what you are reading to find out will often help you to know whether to read rapidly or slowly. Second, some things should be read slowly. Examples are direc...
C
mmlu
Question: Every day, it is easy to see advertisements all around us. Look around. How many different advertisements can you see? Often products show the names of the companies that made them. This is a popular form of advertising. The special picture or symbol, for example, _ , appears on many different products. When ...
A
mmlu
Question: One day a young man was standing in the middle of the town announcing that he had the most beautiful heart in the whole town. A large crowd gathered, and they all thought it was perfect. There was not a flaw in it. Suddenly, an old man said, "Your heart is not nearly as beautiful as mine." The crowd and the y...
C
mmlu
Question: In 1982 Steven Callahan was crossing the Atlantic alone in his sailboat when it struck something and sank. He was out of the shipping lanes and floating in a life raft, alone. His supplies were few. His chances were small. Yet when three fishermen found him seventy-six days later, he was alive. His account of...
B
mmlu
Question: A year ago, I paid no attention to English idioms, though my teacher emphasized the importance again and again. But soon, the importance of English idioms was showed in an _ experience. One day, I happened to meet an Englishman, on the road, and soon we began to talk. As I was talking about how I was studyin...
A
mmlu
Question: As civilization proceeds in the direction of technology, it passes the point of supplying all the basic essentials of life--food, shelter, clothes and warmth. Then we are faced with a choice between using technology to provide and fulfill needs which have now been regarded as unnecessary or, on the other hand...
C
mmlu
Question: Depression is the second most common cause of disability worldwide after back pain, according to a review of research. The disease must be treated as a global public health priority , experts report in the journal PLOS Medicine. The study compared depression with more than 200 other diseases and injuries as ...
A
mmlu
Question: Inventions named after people Many new things are invented each year. Interestingly, some inventions are named after the people who invented them, making the inventions and inventors easier to be remembered. The bowler hat is named after London hat-makers Thomas and William Bowler. The brothers received an or...
D
mmlu
Question: What season is the Northern Hemisphere experiencing when it is tilted directly toward the Sun? Choices: A. fall B. winter C. spring D. summer
D
mmlu
Question: Jim, a young farmer, was once put into prison . One day, he got aletter from his mother. "I'm so worried about our farm,"she wrote. "It'stime to plant potatoes. I can't dig all the fields by myself. Jim read the letter and became sad. "What can I do?" he thought. Then he had a good idea. He wrote to his moth...
A
mmlu
Question: Mr Green is a teacher of English. He comes from America. He teaches English in China. He speaks English quite well. He reads a lot of books and his wife Mrs Green often writes books for the students. He gets up at five in the morning. He leaves home at ten to six. He begins the first lesson at 8:00. He teache...
C
mmlu
Question: Patty Griffin Patty Griffin is a songwriter, and has been highly respected for her works in music. Her childhood. was full of music because both her mother and her grandmother liked singing. She bought her first guitar at 16, began writing songs in high school and soon started playing with a band called Patt...
C
mmlu
Question: A skinny young boy loved football with all his heart. But being half the size of the other boys, he got ly nowhere. This teenager lived alone with his father. Even though the boy was always standing on the bench , his father was always standing with cheering. He never missed a game. This young man was still ...
B
sciq
Question: What is the second highest mountain in the world, at over 28,000 feet? Choices: A. pikes peak B. makalu C. k2 D. everest
C
mmlu
Question: Not everyone can afford their own vehicle,and with the high demands of consumers and incredible expectations of today g leading engineers,public transportation needs all the improvement it can get. Nowadays,there aren't many comfortable alternatives to owning your own car,unless you're happy with inaccess...
C
mmlu
Question: My Best Enemy Once again, I was in a new school. So was a girl in my class named Lisa. That's where the similarities ended. I was tall and she was small. My thick black hair had been recently cut short into an untidy style. Her natural blonde hair flowed to her waist and looked great. I was 12 and one of the ...
D
mmlu
Question: Why are people interested in eating raw foods or whole foods ? One reason is that eating these types of food reduces the risk of acid accumulation in your body. Raw and whole foods are usually digested more efficiently than cooked foods. When we cook foods, we destroy the natural enzymes that are part o...
B
mmlu
Question: Try reading the following sentences as fast as you can. " She sells seashells by the seashore. The shells she sells are surely seashells. So if she sells shells in the seashore, I'm sure she sells seashore shells." Not very easy, was it? What you've just read is called a tongue twister . It is an exercise mad...
C
mmlu
Question: Harris, a heroin addict, broke into a house and took several cameras and watches, which he promptly pawned to obtain cash with which to obtain a "fix." Harris was later charged with larceny of the cameras and watches. Choices: A. Commonwealth v. Mason. Two sisters see a wealthy neighbor's pedigreed dog on the...
A
sciq
Question: Fractures and faults are terms you hear when talking about? Choices: A. earthquakes B. storms C. volcanoes D. magnets
A
mmlu
Question: The first English dictionary was published in 1604. The dictionary was actually nothing more than a list of about 3, 000 difficult words, each followed by a one-word definition. The author, Robert Cawdrey, made no attempt to include everyday words in his dictionary. No one, he reasoned, would ever have to loo...
A
mmlu
Question: Today, Anne is hungry. She wants to eat somewhere in town. There is a popular diner in town. She goes there and asks them if she can get fries and a chocolate milkshake. Her friends come into the diner and sit with her. Their names are Jane, Jake and Dave. All of them are 15 years old. Jake gets a big chee...
A
mmlu
Question: John Fisher, a builder, and his wife Elizabeth wanted more living space, so they left their small flat for an old 40-meter-high castle tower. They have spent five years turning it into a beautiful home with six floors, winning three architectural prizes. "I love the space, and being private," Elizabeth says. ...
C
mmlu
Question: As they migrate , butterflies and moths choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances. Scientists have long thou...
A
mmlu
Question: Zoos divide opinion : there are those who think it is cruel to keep animals locked up while others believe zoos are essential for the survival of endangered species. To argue that zoos imprison animals is to misunderstand what zoos are about. Without zoos many of the creatures we love and admire would no long...
C
mmlu
Question: I do a lot of hiking.And I can step out of my house and within minutes reach a beautiful forest where I walk for exercise every day.I see many photography subjects such as parrots,snakes,hares,big trees and flowers.There are so many different flowers around my place that once I decided to see how many types I...
B
mmlu
Question: I have happy memories of trips to Europe, but my trip to Romania was unique. When I was there as recalled, it was like being in a "James Bond" movie. My husband was born there, but his family sent him to study in Italy. Before he left, his mother told him, "As long as I write in pencil, don't come back. Whe...
D
mmlu
Question: LONDON --- A British judge on Thursday sentenced a businessman who sold fake bomb detectors to 10 years in prison, saying the man hadn't cared about potentially deadly consequences. It is believed that James McCormick got about $77.8 million from the sales of his detectors which were based on a kind of golf b...
B
mmlu
Question: People often joke that when a person has bad handwriting he must be a doctor. Handwriting is still an important part of our everyday life. We may spend a lot of time typing on a computer for work and less time writing things down, but it doesn't mean we should forget the basic skills. The following may be use...
C
mmlu
Question: Bored? Don't know what to do with your time? Get your friends or family together, go to the park or go hiking, do something fun --just don't turn on your TV. The 10th annual TV-Turnoff Week starts on Monday. The TV-Turnoff Network, a nonprofit organization, began the program in 1994 to get children and adults...
B
mmlu
Question: A father sat at his desk and looked at his bills when his young son rushed in and announced: "Dad, because today is your birthday and you're 40 years old, I'm going to give you 40 kisses, one for each year!" When the boy started making good on his word ( ) , the father shouted: "Andrew, don't do it now. I'm ...
D
mmlu
Question: Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and video games are full of gunplay and bloodshed, and one might reasonably ask what's wrong with a society that presents videos of violence as entertainment. Viewing large amounts of violent television and vide...
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mmlu
Question: Pan Aiying, a Chinese teacher at Wutou Middle School in Qihe County, in East China's Shandong Province, didn't think her text messages would help to get her belongings back. A young man riding a motorcycle robbed her of her bag, in which there was her mobile phone, bank cards and 4,900 yuan, as she was riding...
C
mmlu
Question: This is an excerpt from Emma Watsons speech at the United Nations headquarters. Today we are launching a campaign(called "He For She"). I am reaching out to you because we need your help. We want to end gender inequality, and to do this, we need everyone involved. This is the first campaign of this kind in th...
A
mmlu
Question: Now I would like to talk to you about your final exam. The exam will be held next Thursday, the last day of the exam week. Remember to bring two or three pens in case they run out of ink. Unlike the midterm exam, this test will not include multiple-choice questions, it will contain entirely of essays . You w...
D
mmlu
Question: My father was lame and very short. I was very shy to be seen with my father when I was growing up. When we walked together, he used to put his hand on my arm for balance, and people would stop to watch us. So I didn't like to go out with him. Sometimes my mother left our town to see her sister, and I had to ...
D
sciq
Question: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions? Choices: A. b.a.p cell receptors B. er cell receptors C. b cell receptors D. a.m. cell receptors
C