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Article: If you are in a town in a western country, you'll often see people walking with their dogs. It is still true that a dog is the most useful animal in the world. But the reason why one keeps a dog has changed Once upon a time, a man met a dog and wanted it to help him in the fight against other animals, and he found that the dog listened to him and did what he told him to. Later people used dogs for hunting other animals, and the dogs didn't eat what they got until their master agreed. So dogs were used for driving sheep and guarding chicks. But now the people in the towns and cities do not need dogs to fight other animals. Of course they keep them to frighten thieves, but the most important reason is that people feel lonely in the city. For a child, a dog is his best friend when he has no friends to play with. For a young wife, a dog is her child when she doesn't have her own. For old people, a dog is also a child when their real children have grown up and left. Now people do not have to use a dog, but they keep it as a friend, just like a member of the family. Question: In the past, people kept dogs because dogs _ . Yes or no, is the answer "helped and listened to people"?
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No

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Article: Believe it or not, the ability to choose is the power to change. If you can choose to live your life differently, will you be the same person? Well, choosing to do the following few "simple" things will help to change your life. Review your life. Take time to go through your life and ask yourself, "If I do the same thing I do every day, will there be a change? If I want to change, where will my first step be?" Make careful choices. Choose exactly what you wish to get to live your life; describe and think what you really want. Keep up with chances. Find out about the possibilities and ways that can make you move toward your goals, write them down and see which one suits you most. Get down to business. Start working on your goals. People may bring you down; you may have difficulties; you will fail and want to give up. But the most important thing is never to give up. If you try these "simple" things, you will find that success is something for everyone, and you will finally become what you want to be. Remember, success is more than what you hold in your hands; _ is something from the heart. Question: This passage mainly discussed the relationship between _ . Yes or no, is the answer "choice and change"?
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No

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Article: A camera and a computer can "see" something that perhaps millions of pairs of eyes failed to see for 480 years: the Mona Lisa's necklace. The discovery about the famous painting was made by an American physicist. The Mona Lisa, painted by the Italian, Leonardo da Vinci, has been on show for many years in Paris. Now a row of white spots on the neck have been "seen". They are said to be the remains of a necklace which the artist later painted over. The painting will be examined further by using infrared scanning techniques. Laser technology can be used to show what lies directly under the surface of the finished work, too. This will help us to understand how the artist drew the picture: Did he begin with a quick-made drawing or have second thoughts as he painted the picture? This kind of knowledge will show us the famous artist at work. It may also help to explain Mona Lisa's smile, which has puzzled art lovers for centuries. Question: This passage is mainly about _ . Yes or no, is the answer "further researches on the Mona Lisa"?
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No