Computers have beaten human world champions at chess and, earlier this year, the board game Go. So far, though, they have struggled at the card table. So we challenged one AI to a game. Why is poker  so difficult? Chess and Go are "information complete" games where all players can see all the relevant information. In poker, other players' cards are hidden, making it an "information incomplete" game. Players have to guess opponents' hands from their actions--tricky for computers. Poker has become a new benchmark for AI research. Solving poker could lead to many breakthroughs, from cyber security to driverless cars. Scientists believe it is only a matter of time before AI once again _ humans, hence our human-machine match comes up in a game of Texas Hold's Em Limit Poker. The AI was developed by Johannes Heinrich, researcher studying machine learning at UCL. It combines two techniques: neural  networks and reinforcement learning . Neural networks, to some degree, copy the structure of human brains: their processors are highly interconnected and work at the same time to solve problems. They are good at spotting patterns in huge amounts of data. Reinforcement learning is when a machine, given a task, carries it out, learning from mistakes it makes. In this case, it means playing poker against itself billions of times to get better. Mr Heinrich told Sky News: "Today we are presenting a new procedure that has learned in a different way, more similar to how humans learn. In particular, it is able to learn abstract patterns, represented by its neural network, which allow it to deal with new and unseen situations." After two hours of quite defensive play, from the computer at least, we called it a draw. Why can't the computer beat humans at the poker game? A) Because humans are cleverer than the computer. B) Because humans practice playing the poker game every day. C) Because the computer can't learn the regular rules of the poker game. D) Because the computer can't know the other players' cards completely.
D


(Question)
We are surrounded by mixed messages about mistakes: we're told we earn by making them, but we work hard to avoid them. So the result is that most of us know that we are going to make mistakes, but deep down, we feel we shouldn't. Experiments with schoolchildren who did well on a given test show that those who were praised for being smart and then offered a more challenging or less challenging task afterward usually chose the easier one. On the other hand, children praised for trying hard-rather than being smart-far more often selected the more difficult task. If we try hard to avoid mistakes, we aren't open to getting the information we need in order to do better. In a writing study, experiments showed that those who are so scared to make mistakes perform worse in writing tasks than those who aren't as worried about being perfect. They fear receiving any kind of negative feedback, so they don't learn where they went wrong and how to get better. We don't just learn more when we're open to mistakes, we learn deeper. Research tells us that if we're only concerned about getting the right answer, we don't always learn the underlying concepts that help us truly understand whatever we're trying to figure out. Mistakes need to be seen not as a failure to learn, but as a guide to what still needs to be learned. As Thomas Edison said, "I am not discouraged, because every abandoned wrong attempt is another step forward. " Furthermore, we often make mistakes because we try new things-we wander away from accepted paths. Teflon, penicillin-these are examples of great discoveries made by mistake. Take a page from Albert Einstein, who said, "Anyone who has never made a mistake has never tried anything new. " What's the main idea of the passage? A) We can never avoid making mistakes when we work. B) Success can't be achieved without making mistakes. C) Mistakes should be treated with a correct attitude. D) Try every means to avoid mistakes in our daily life.
(Answer)
C


Ques: Several decades ago, US sociologists developed a series of universal facial images supposed to represent the seven basic human emotions: happiness, sadness, surprise, fear, disgust, anger and neutrality  . But now, a new study by researchers at the University of Glasgow indicates that these standardized facial images aren't so universal at all. For the study, the Scottish researchers found 13 Western Caucasians (mainly Europeans) and 13 East Asians (mostly Chinese students). The volunteers were shown the standardized facial images and asked to identify the emotions being expressed. At the same time, the researchers electrically monitored the eye movements of the volunteers. According to the results, published in the journal Current Biology, the Asian participants had a harder time than the Caucasians telling the difference between a face meant to look fearful compared with one showing surprise, and a face supposedly expressing disgusting compared with one displaying anger. "This strongly suggests that the meanings of facial expressions are different across cultures," says Rachael Jack, who led the study. The study also showed that the volunteers focused on different parts of the face in their efforts to understand the underlying  emotions. "Westerners look at both the eyes and the mouth to the same degree, yet Easterners favor the eyes and overlook the mouth. This means that Easterners has difficulty distinguishing facial expressions that are similar around the eyes," Ms Jack says. The faces representing fear and surprise" both have big, wide open eyes, while the mouths are very different," she notes. "It would be difficult to distinguish between the two if you didn't look at the mouth." So why would different cultures express emotions in different ways? Ms Jack thinks it may be considered impolite in some Asian cultures to display certain emotions in an obvious manners, and that they use more subtle ways to express them. In particular, muscle movements around their eyes could be more important for expressing... In the experiment, the Asian volunteers had difficulty distinguishing between fear and surprise because  _  . A) they found no differences between the mouths B) they focused on the eyes and neglected the mouth C) they were not good at reading facial expressions D) they expressed fear and surprise in the same way
Ans: B


Carl studied in our middle school three years ago. Last August his father found a job in another city and his family moved there. He began to study in the new school and we often write to each other. He often tells me something about the city where he lives now and his studies in the school. So I can know what happens to him. Last Friday Carl came to our city again. He hoped to accompany  his old grandpa during the summer holiday. He was taller and stronger than before. We swam in the river outside the city together and had a picnic on the island. It surprised me that he had learnt to cook when we were traveling in the wild forest. He told me his parents were both busy and sometimes he stayed at home and he had to look after himself. "How do you like your school?" I asked. "Wonderful," said the young man." It has a tall building and there 're two chemistry labs, two biology labs and three physics ones. And its library is big and there're plenty of books in it." "I can see you are satisfied with it." "Yes," he answered. "But our geography teacher often says it himself in class." "So does our new history teacher." I said. "But he doesn't notice it. He often talks on and on in a flow of the eloquence , but none of us listens to him." _  , so he learned to cook. A) Carl liked all kinds of delicious foods. B) Carl had to do some cooking when he was alone. C) Carl found a job in a restaurant. D) Carl often had a picnic with his friends

B