In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

[Q]: Article: In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping According to a weather expert's prediction , the atmosphere will be 3degC warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate.If this warming up took place.the ice caps in the poles would begin to inch,thus raising sea level several meters and severely flooding coastal cities.Also.the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere ,possibly resulting in an alteration of the earth's chief food growing zones. In the past,concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet.But the weather experts are now paying more attention to West Antarctic.which may be affected by only a few degrees of warming,in other words,by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels. Satellite pictures show that large areas of Antarctic ice are already disappearing.The evidence available suggests that a warming has taken place.This fits the theory that carbon dioxide warms the earth. However, most of the fuel is burnt in the northern hemisphere,where temperatures seem to be falling.Scientists conclude,therefore ,that up to now natural influences on the weather have gone beyond those caused by man.The question is:Which natural cause has most effect on the weather? One possibility is the variable behavior of the sun.Astronomers at one research station have studied the hot spots and 'cold' spots (that is, the ly less hot spots)on the sun.As the sun rotates ,every 27.5 days,it presents hotter or colder faces to the earth,and different aspects to different parts of the earth.This seems to have a considerable effect on the distribution of the earth atmospheric pressure,and consequently on wind circulation.The sun is also changeable over a long term:its heat output goes up and down in cycles,the latest trend being downward. ' Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years,including the last ice Age.The problem is that the models are predicting that the world should be entering a new Ice Age and it is not.One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth's climate.If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat.
Question: It can be concluded that a concentration of carbon dioxide in the atmosphere would_.
Options: (A) mean a warming-up in the Arctic (B) raise the temperature of the earth's surface (C) prevent the sun's rays from reaching the earth's surface (D) explain the cause of great changes in the climate in the northern hemisphere
[A]: B

[Q]: Article: Have you ever felt so anxious during an examination that you couldn't even put down the answers you knew? If so, you were suffering from what is known as test anxiety. According to psychologist Ralph Trimble, test anxiety is a very real problem for many people. When you're worried over your performance on an exam, your heart beats faster and your pulse speeds up. These reactions start others: You may sweat more than normal or suffer from a stomachache or headache. Your field of vision narrows and becomes tunnel-like. Before you know it, you're having difficulty focusing. "What I hear students say over and over again," says Dr. Trimble, who is working at the Psychological and Counseling Center at the University of Illinois, "is, 'My mind went blank.'" For a number of years, Dr. Trimble helped many students learn how to perform better during exams and to bring up their grades. Some of these students were interested in sharing what they learned and, with Trimble's help, began holding workshops on overcoming test anxiety. For many students, just being in a workshop(,) with other sufferers made them feel better. They realized that they were not the only ones who had done poorly on tests because of tension. The workshops were so successful that they are still given. In the workshops, students are taught that anxiety is normal. You just have to prevent it from getting the best of you. The first step is to learn to relax. If before or during an examination you start to panic, stretch as hard as you can, tensing the muscles in your arms and legs; then suddenly relax all of them. This will help relieve tension. But keep in mind that you don't want to be too relaxed. Being completely relaxed is no better than being too tense. "If you are so calm you don't care how you do on an examination, you won't do well," Trimble says. "There is an optimum level of concern when you perform at your best. Some stress helps. There are people who can't take even slight stress. They have to learn that in a challenging situation, being anxiously excited is good and will help them to do better. But if they call it anxiety and say, 'It's going to hit me again,' that will make them nervous and worried." As a student you must also realize that if you leave too much studying until a day or two before the examination, you can't do the impossible and learn it all. Instead, concentrate on what you can do and try to think what questions are likely to be asked and what you can do in the time left for studying. When you sit down to study, set a moderate pace and vary it by reading, writing notes, and going over any papers you have already written for the course, as well as the textbooks and notes you took in class. Review what you know. Take breaks and go to sleep early enough to get a good night's rest before the exam. You should also eat a moderate breakfast or lunch, avoid drinks like coffee and stay away from fellow students who get tense. Panic spreads easily. Get to the exam room a few minutes early so that you will have a chance to familiarize yourself with the surroundings and get out your supplies. When the examination is handed out, read the directions twice and underline the significant instructions, making sure you understand them. Ask the teacher to explain if you don't. First answer the easiest questions, then go back to the more difficult. On essay questions, instead of starting right away, take a few minutes to organize your thoughts, make a brief outline, and then start off with a summary sentence. Keep working steadily, and even when time starts to run out, don't speed up.
Question: According to the passage, being completely relaxed before a test _ .
Options: (A) helps a student to perform better in the test (B) can also be harmful to a person's performance in the test (C) helps a student to cope with a challenging situation better (D) may be more harmful that getting too worried over tests
[A]: B

[Q]: Article: Does happiness have a scent? When someone is happy,can you smell it? You can usually tell when someone is happy based on seeing them smile,hearing them laugh or perhaps from receiving a big hug.But can you also smell their happiness? Surprising new research suggests that happiness does indeed have a scent,and that the experience of happiness can be transmitted through smell,reports Phys.org. For the study,12 young men were shown videos meant to bring about a variety of emotions while researchers gathered sweat samples from them.All of the men were healthy and none of them were drug users or smokers,and all were asked to abstain from drinking or eating smelly foods during the study period. Those sweat samples were then given to 36 equally healthy young women to smell,while researchers monitored their reactions.Only women were selected to smell the samples,apparently because previous research has shown that women have a better sense of smell than men and are also more sensitive to emotional signaling--though it's unclear why only men were chosen to produce the scents. Researchers found that the behavior of the women after smelling the scents--particularly their facial expressions--indicated a relationship between the emotional states of the men who produced the sweat and the women who sniffed them. "Human sweat produced when a person is happy brings about a state similar to happiness in somebody who breathes this smell," said study co-author Gun Semin,a professor at Koc University in Turkey. This is a fascinating finding because it not only means that happiness does have a scent,but that the scent is capable of transmitting the emotion to others.The study also found that other emotions,such as fear,seem to carry a scent too.This ensures previous research suggesting that some negative emotions have a smell,but it is the first time this has proved to be true of positive feelings. Researchers have yet to isolate exactly what the chemical compound for the happiness smell is,but you might imagine what the potential applications for such a finding could be.Happiness perfumes,for instance,could be invented. Scent therapies could also be developed to help people through depression or anxiety. Perhaps the most surprising result of the study,however,is our broadened understanding of how emotions get communicated,and also how our own emotions are potentially managed through our social context and the emotional states of those around us.
Question: What is the main finding of the new research?
Options: (A) Men produce more sweats. (B) Negative emotions have a smell. (C) Pleasant feelings can be smelt out. (D) Women have a better sense of smell.
[A]:
C