Read the article and select the best answer. Article: While most people consider that laughter is one of the nature's great treatments for a whole range of mental and physical diseases, it is still a serious scientific subject that researchers are trying to figure out. "Laughter is social." says Robert R. Provine, author of the book "Laughter: A Scientific Investigation", who has been studying laughter for decades. "Almost all people laugh 'ha-ha-ha' basically the same way. Whether you speak Mandarin, French or English, everyone will understand laughter. There is a pattern generator in our brain that produces this sound. Laughing is also a good way of communicating. Babies laugh long before they speak. No one teaches them how to laugh. They just do it. People may laugh at a prank on April Fools' day. But surprisingly, only 10 to 15 percent of laughter is the result of someone making a joke. Laughter is mostly about social responses rather than reaction to a joke. Deaf people laugh without hearing and people on cell phones laugh without seeing, which shows that laughter isn't dependent on a single sense but on social interactions. And laughter is not just a human thing. Chimps tickle each other and even laugh when another chimp pretends to tickle them. Jaak Panksepp studies rats that laugh when he tickles them. It turns out rats love to be tickled. They return again and again to the hands of researchers tickling them, Panksepp's video shows. By studying rats, scientists can figure out what's going on in the brain during laughter. It has been found that laughter in rats produces a chemical that acts as an antidepressant and anxiety-reducer. Scientists think the same thing probably happens in humans, too. This would give doctors a new chemical target in the brain in their effort to develop drugs that fight depression and anxiety in people. Even so, laughter itself has not been proved to be the best medicine, experts said. "No study has shown that laughter produces a direct health benefit," Provine said, "largely because it's hard to separate laughter from just... Question: Why does the writer say "laughter is mostly about social responses rather than reaction to a joke"? Options: A: because people can communicate with each other by laughing. B: because laughter is the same sound in all the human's languages. C: because laughter is considered a basic language all people can learn. D: because everyone can understand the meaning of the word laughter.
A

Read the article and select the best answer. Article: Two girls living next door to each other-a seemingly plain scene that has two very different life .stories behind it. Chi Zhen, an 18-year-old student in Seville, Spain, used his camera to tell the story of two lives, which went widespread online. Comments on the photos indicate that they have inspired many, to believe that the future is in their own hands. Chi has seen many youths living life without a goal, wasting their time and blaming bad luck for it. Feeling regret for them, he took a series of photos of his friends Veronica and Anna Maria, both freshmen at the University of Seville in Spain. They live completely different life styles and are getting opposite results. Chi hopes the photos will inspire those who have let go of their own fate . In the photos, Anna Maria, a Spanish girl, can be seen watching a TV programme . She spends most of her time in front of her laptop. She rarely goes out, because she thinks she's not attractive and doesn't know what to say in social situations. "'I'm not as lucky as Veronica," she often says. But she doesn't know that while she's wasting time watching TV, -Veronica, the "lucky" girl next door,has taught herself four foreign languages and traveled to many places. She goes to the library frequently and her extensive knowledge and experience allow her to take part in any conversation and become the center of attention. Chi thinks that Anna Maria resembles many of his Chinese .friends who study abroad. They are trapped to their little circles, never trying to change their fate./'They say 'maybe I'll do it in my next life', but they are in their 20s, their best time. How can they give up hope and accept this as their life?" Chi says. The influence of the photos has gone far beyond what Chi expected. One user commented on his photos on Renren.com, saying, "A wall separates two worlds, and the life we have depends on what we do." Another is determined to make a change right away. "I'm turning off my laptop and not watching TV anymore," he wrote. Question: It can be concluded from the widespread photos online that _ ' Options: A: life one has depends on what one does B: Anna is an attractive girl with a goal C: Veronica is much luckier than Anna D: Chi wastes his time in taking photos
A

Read the article and select the best answer. 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: Which of the following best describes dolphins? Options: A: Talkative and easygoing. B: Carful and hardworking. C: Brave and determined. D: Friendly and smart.
D