Maybe everyone likes dogs, and almost everyone likes to read stories about dogs.
　  I have a friend. He has a large police dog named Jack. Police dogs are very clever. Every Sunday afternoon my friend takes Jack for a long walk in the park. Jack likes these long walks very much.
　  One Sunday afternoon a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack for his walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention to Jack. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor's hat in his mouth. The visitor saw it and was surprised. He laughed and left.

    You might think that Olympic athletes are the healthiest people in the world. It's true that many are. However, it's also true that many Olympic athletes had to overcome (克服) illness early in their lives.

    One excellent example is Wilma Rudolph. She competed in track-and-field (田径) events in the 1960s Olympics. She didn't win just one gold medal (奖章).She won three. At the time, people called her ”the fastest woman in the world”.

    Actually, as a young child, Wilma could not take part in sports. She had serious illnesses, and then, at the age of 4, she got polio (小儿麻痹症).She lost the function of her left leg, and the doctor said she could never walk again.

Wilma's family did everything they could to help her walk again. Wilma and her mother used to travel 100 miles to get treatments for her leg. Her brothers and sisters took turns to give her leg a daily massage (按摩).Four times a day, they helped her do special exercises for her leg. Amazingly, by the time Wilma was 9 years old, she was able to walk again. Before long, she started playing basketball and running. In high school, she was a track star and then she went to the Olympics.

    Wilma stopped being a runner when she was 22 years old. She then became a teacher and a track coach. Her story encouraged many people to work hard and to overcome difficulties.

    Mark Zuckerberg, the founder of Facebook, is an American computer programmer. His net worth (资产净值) is about $71 billion, ranking him the fifth richest person in the world. On 1 December, 2015, he and his wife announced that they would give 99 per cent of their Facebook shares to the Chan Zuckerberg Fund. Since 2010, Time magazine has named Zuckerberg among the 100 wealthiest and most influential people in the world.

    Born in 1984, he and his three sisters were brought up in a small village in New York. At high school, Zuckerberg was outstanding in class. He won prizes in science. He could also read and write French, Hebrew, Latin, and ancient Greek. Zuckerberg began using computers and writing software at middle school. His father taught him basic programming in 1990. He enjoyed developing computer programs, especially communication tools and games. During his high school years, he built a software program called ZuckNet that allowed all the computers between the house and his fathers dental office to communicate with each other. The following year, he built a music player called the Synapse Media Player. It used machine learning to learn the user's listening habit.

    In 2004, Zuckerberg launched Facebook from Harvard. He left Harvard in his second year to complete his project—Facebook. Helped by his college roommates and fellow Harvard students, Facebook expanded rapidly, reaching one billion users by 2012.

    In 2003, Zuckerberg met Priscilla Chan, at a party during his second year at Harvard. They have been dating since their Harvard days. In 2010, they got married and had their first baby, Maxima. The couple announced on their Chinese New Year video that their daughter's Chinese name is Chen Mingyu. On 18 March, 2016, while visiting Beijing, he posted on Facebook, "It's great to be back in Beijing! I kicked off (开始) my visit with a run through Tiananmen Square, past the Forbidden City and over to the Temple of Heaven." With a Chinese American wife and speech in Mandarin (普通话) in Tsinghua University, Zuckerberg is famous in China. He seems to be willing to take efforts to make Facebook available in the mainland to connect all people in the world.