【1】A safari park is a park in which wild animals are kept. They are mainly located in east or central Africa. They often occupy a very wild area, with mountains and rivers. To visit the park and look at the animals, people have to drive around in a car for a few of hours because the park is huge.

【2】In south Africa there is a safari park, which contains all sorts of wild animals like lions, elephants, rhinoceroses(犀牛), zebras, wild pigs, deer and giraffes.

【3】There is a wild road leading through the park, but nobody is permitted to walk on the road. Anyone traveling in the park has to go in a car because wild animals may fiercely attack people. From the car he may see almost every types of African wildlife. Some of these are getting scarce (稀有的) because people kill them for various reasons. For example, rhinoceroses are killed for their horns (角), which are used in traditional Chinese medicines for colds and headaches. Perhaps they will be seen only in museums and books one day.

【4】Travels may buy food for the animals. They can feed them when they tour the park. Of course, they should not feed them in a close distance because the wild animals may attack people. In addition, they should only give proper food to the animals.

【5】A traveler may carry a gun with him in his journey. The gun is given to him by the government. However, it is not used for hunting. In fact, a seal(封条) is fixed to it. The traveler may fire at a wild beast to defend himself in case he is attacked. However, he has to prove to the government that he has been attacked and that he has not fired at a harmless animal.

     “Let's Talk”：The Free Advice Project

A few weeks ago, I took a walk around Washington Square Park. I met all the usual people：street performers, the Pigeon Guy, a group of guitarists singing in harmony. But off to the side, sitting on a bench was a woman doing something vastly different—giving free advice.

    A week or two later, I set up an interview with her and we discussed her project at length.

    Lisa Podell, 32, started the Free Advice Project this past May. It began as an experiment；she sat in Washington Square Park for a day with a sign that read “Free Advice” as a simple way to reach out to people. Podell was astonished at the strong response.

    Podell admits that she was doubtful at first, but now she describes the project as mutually (相互地) beneficial. People learn from her—but she also learns from them. She says that the majority of those who come to her are dealing with some pretty heavy issues, and they expect her not only to listen, but also provide real answers.

    Having worked as a full time teacher and now as an adolescent advisor, Podell believes that talking things out is an important in the decision-making process.

    Sometimes, people walk around all day, keeping their problems in their own head and thinking about them in the same way. Podell simply strives to provide people with perspective.

    I asked if there is a future plan for the Free Advice Project. Podell said she would like to promote it to each public space in New York, which would be carried out by various volunteers across the city.

    It was truly inspiring to meet someone with such a big heart, especially in New York—where it is sometimes very hard to find anybody to listen.(303 words)

    Skating backwards on ice is a bit difficult but once you master the basis, there's nothing like it. Follow the steps given below and you will be able to skate backwards in no time.

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    The first thing that you need to do is, stand straight. If you feel that you are falling backwards, then just put your chin up and slightly bend your knees. Don't worry; this happens to all.

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    The most important step while learning how to skate backwards, is having enough confidence in yourself and in what you are doing. How can you achieve this? By practice, Just practice rolling backwards down a gentle slope every single day or just by pushing off from a wall or something of that sort.

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    Confident now? Great! Now the next step is to maintain your speed．While rolling in a straight line with one skate, with the other try sculling(滑浆), that is, keep pushing yourself backwards with an outwards stroke(滑动)．Now bring the skate which you were using to scull, and then again, repeat the same process．Make sure that you put most of your weight on the skate which is moving straight and not the one with which you are sculling．Now, try the same thing using the other foot．Again keep doing this till you are confident enough．

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    Once you are confident that you can scull with either foot, the next thing that you have to do is increase your speed．Try some of your own tricks now．Scull with either foot or with both at the same time．

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    While you keep one foot straight, keep sculling with the other．You can do that simultaneously with both feet．Concentrate on what you are doing but don't get so involved that you don't see where you are going．If you are not watching your back, you might just bang against something or someone．

A. Find Another to Practise with You

B. Increase Your Speed Now

C. Gain Your Courage

D. Stand Straight

E. Maintain Speed

F. Scull and Be Aware

G. Confidence is What You Need

    If you travel, you will leave a carbon footprint in your wake. You can't help it. But eco-friendly travel practices can lighten the harm on Mother Earth. Green travel is not a passing trend but a lifestyle choice. {#blank#}1{#/blank#}.

    Choosing a green destination

    No destination is a Green Giant. {#blank#}2{#/blank#}. However, some countries and cities show a deep commitment to Earth-friendly policies and practices. When researching a vacation spot, look for places that naturally embrace the green lifestyle.

    Choosing green transportation

    What makes Mother Earth proud? Seeing you use your own power to get around. Many adventure tour operators arrange cycling, hiking and walking holidays. {#blank#}3{#/blank#}. The greenest rides typically run on electric power. Switzerland is taking the lead with its hybrid buses and trains powered by hydroelectricity; Japan is running close behind.

    Choosing a green hotel

    Once you are at your destination, if you can get the hotel right, you can make the greatest impact. {#blank#}4{#/blank#}. Look for a fact sheet online, or call the front desk. You can also search for hotels approved by respected certification programs, such as Green Key and the Global Sustainable Tourism Council.

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    The Earth-friendly choices are numerous: You can sail, bike, kayak, bike, swim, bird-watch and play I-spy-a-monkey in a tree. Visit a local food market, and don't forget to bring a reusable bag for purchases. You can also lend a hand during your holiday. The green movement has changed from how to preserve and protect to how to use less and do good when you're there.

A. Choosing green travel

B. Choosing green activities

C. Next in line are trains and buses

D. They all make environmental missteps

E. Most major chains operate in-house green program

F. If you plan to drive, consider a fuel-efficient vehicle

G. Follow the tips and watch your footprints turn greener

How to Overcome Challenges in Your Life

    We all face tough and difficult challenges in life. To overcome challenges you need to have that "never quit" attitude in life. If you develop it, you'll overcome quite a bit.

    Motivate yourself. Say "YES, I CAN." The challenge should bring out the best of you in this situation. Slow it down, and think that process through.{#blank#}1{#/blank#} If you develop that mindset(心态), you'll get it done.

    Stay calm and cool­headed. Remain calm when you're facing serious troubles and problems in life. You have to recollect yourself, and calm down. You can't solve problems when you're panicking. Take a deep breath, relax, and slow it down. Think things through calmly.

    Let failure and fear fuel you in a positive way. Everyone fails at times. If you fail the first, second, or third time, don't give up.{#blank#}2{#/blank#}

    Learn what made you fail and overcome these challenges. Simplify the challenge you're facing. Make the challenge easier than it is. Start by breaking it down into steps. As you get through each step, you develop more confidence and you believe you can get it done, and then you will overcome them.

    {#blank#}3{#/blank#} To overcome a challenge, you have to believe you can really do it. You have to find out all the ways you can use to overcome it, and put them to full use with all your effort. It's our own mental stability that's the difficult part. When you do it mentally, you'll actually be able to do it.

A. Stay positive and confident.

B. Most people will avoid any challenge, because they're scared of failing.

C. Develop that confidence in saying there's no way you're going to fail at this.

D. Pick yourself up, and learn from why you've failed, and move on in a positive direction.

AlphaZero--an Updated Model of AI

    Soon after Garry Kasparov, the former world chess champion, lost his rematch against IBM's Deep Blue in 1997, the short window of human-machine chess competition slammed shut forever. Unlike humans, machines keep getting faster, and today a smartphone chess app can be stronger than Deep Blue. However, as people see with the new AlphaZero system, machine dominance has not ended the historical role of chess as a laboratory of cognition.

    Much as airplanes don't flap their wings like birds, machines don't produce chess moves like humans do. Based on a generic algorithm (算法), AlphaZero incorporates deep learning and other AI techniques like Monte Carlo tree search to play against itself to develop its own chess knowledge. Unlike the traditional program Stockfish, which employs many preset evaluation functions as well as opening and endgame moves, AlphaZero starts out knowing only the rules of chess, with no preset human strategies. In a few hours, it plays more games against itself than have been recorded in human chess history. It teaches itself the best way to play, reevaluating the relative values of the pieces. It quickly becomes strong enough to win 28, draw 72, and lose none in a victory over Stockfish. Since AlphaZero can program itself, this superior understanding allows it to outclass the world's top traditional program despite calculating far fewer positions per second. It's the typical example of the cliché, "work smarter, not harder".

    AlphaZero shows that machines can be the experts, not merely expert tools. Explainability is still an issue—it's not going to put chess coaches out of business just yet. But the knowledge it produces is information humans can learn from. AlphaZero is surpassing humans in a profound and useful way, and researchers are working on transferring the knowledge acquired from AlphaZero to other fields.

    Machine learning systems aren't perfect. Even though great progresses have been achieved, AI algorithms are still struggling on open problems such as computer vision, natural language understanding... There will be cases where an AI will fail to detect exceptions to its rules. Therefore, as Kasparov writes, "We must work together to combine our strengths. I know better than most people what it's like to compete against a machine. Instead of raging against them, it's better if we're all on the same side."