instruction:
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.
question:
Article: Many people say dolphins are very intelligent. They seem to be able think, understand, and learn things quickly. But they are smart like humans or more like cats or dogs? Dolphins use their brains differently from people. But scientists say dolphin intelligence and human intelligence are alike in some ways. How? FACT 1: Talk to Me Like humans, every dolphin has its own "name". The name is a special whistle . Each dolphin chooses a specific whistle for itself, usually by its first birthday. Actually, scientists think dolphins, like people, "talk" to each other about a lot of things, such as their age, their feelings, or finding food. And, like humans dolphins use a system of sounds and body language to communicate. But understanding their conversations is not easy for humans. No one "speaks dolphin" yet, but some scientists are trying to learn. FACT 2: Let's Play Dolphins are also social animals. They live in groups called pods, and they often join others from different pods to play games and have fun ---just like people. In fact, playing together is something only intelligent animals do. FACT 3: Fishermen's Helpers Dolphins and humans are similar in another way: both make plans to get something they want. In the sea of southern Brazil, for example, dolphins use a interesting strategy to get food. When fish are near a boat, dolphins signal to the fishermen to put their nets in the water. Using this method, the men can catch a lot of fish. What is the advantage for the dolphins? Why do they assist the men? The dolphins get to eat some of the fish.
Question: What is the text mainly about?
Options: (A) The comparison between dolphins and humans. (B) The relationship between dolphins and humans. (C) Different types of dolphins. (D) The habitual behavior of dolphins.
answer:
A

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Article: When I was growing up, 16 was always a magical age, a symbol of maturity, responsibility and of course more independence and freedom. I sat through the hours of Driver's Ed classes eager to get out on the road. I couldn't wait to get my driver's license. But it's a different story for today's teens. In January, the U.S. Department Transportation released 2012 data that showed only 30.7 percent of U.S. teens got their license at age 16, Twenty years before, that number was almost 45 percent. There are numbers of reasons for the fall - off. The growing responsibilities like paying for insurance and high gas prices discourage teens from getting behind the wheel. Plus, many teens today are so busy with homework, endless hours of activities and part-time jobs, that finding the time for Driver's Ed classes may be more difficult that ever. In addition, many states have raised the driving age, or restricted when teens can drive and who they can have in the car. Parents may also be making their own personal restrictions until they feel their teens are responsible enough to drive safely. Driving is part of the American culture, but it's not the central focus like it was 25 years ago. They have so many other things to do now. One of the more interesting factors delaying teens driving might be the change of their social life. Today, teens need to look no further than Face book or other social networking sites to connect with their friends. There is simply less need, maybe less desire, to be able to grab the keys and go. Michelle Wei got her license as a senior in high school because her digital social life made it easy no to drive. "If I couldn't get a ride to see my friend who lives a town over," the 19-year-old said, "I could talk on IM or Skype." Research has shown that these online relationships can lead to higher quality friendships, so it isn't necessarily a bad thing. However, it's important to find a balance. If old face-to-face friendships are good, why not drive to find them?
Question: What does the passage mainly talk about?
Options: (A) Desire to drive on the road declines among American teens. (B) Getting a license costs much more than ever before. (C) Social networking sites are changing the life of American teens. (D) American teens are becoming more responsible than ever.
answer:
A

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Article: For years we have been dieting strictly after the year-end overeating, afraid that when summer. comes, the bigger size we have accumulated will betray how we ate. Now scientists say, it's a little bug that causes obesity . As the holiday season with its abundant feasting arrives, millions of food lovers are keeping an eye on their figures. But scientists have found that weight gain is not about too much Christmas turkey or hot chocolates, but some bacteria in your guts . Chinese scientists recently discovered a type ofbacteria in guts that may be to blame for obesity. A research team led by Zhao Liping, a professor in Shanghai, has identified a precise link between a particular kind ofbacteria and unusual weight gain. "The endotoxin released by the bacterium can activate a gene that helps produce fat. And it also deactivates a gene that consumes fat," Zhao says. Scientists have long believed that microscopic organisms in the gut, microbiota, may play a very important role in weight gain, but they had never been able to prove it. In 2004, American microbiologist Jeffrey Gordon and his colleagues discovered a general link between obesity and gut microbiota in mice. While a link was believed to exist, proving it was another matter. "The list of diseases that they may play a role in is just growing and growing," says Lita Proctor, director of the US National Institutes of Health. "But the problem is that we're only able to look at associations and aren't yet able to conduct cause-and-effect studies." In the clinical study, researchers found a growth of too much endotoxin-producing bacteria, leading t0 35 percent ofthe gut bacteria, in an obese patient whose initial weight was 175 kg. Based on this information, researchers tried to cure the patient by feeding him a specialized nutritional liquid food to decrease the bacteria in his guts to ignorable amounts. After 23 weeks, the patient lost 51.4 kg, with his fatty liver disease having almost disappeared.
Question: We diet strictly after the year-end overeating because _ .
Options: (A) we won't betray ourselves (B) we eat too much turkey (C) there are bacteria in our guts (D) we don't want to look fat
answer:
D