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 Jeff Gaye, the young American swimmer, is becoming more and more famous. He has his own teacher, driver and even his own cook. Each time people hear him speak on television, they can't believe he's only 13. Jeff's father is an engineer but he is also his son's manager. He says, "I don't make Jeff do anything he doesn't want to do. He chooses which competition to swim in. But he works hard and wins nearly every race. I cut out all the newspaper articles about him and put them in a big box!”

 Jeff is very busy every day because people want to write about him or photograph (给……拍照) him for magazines. “When I'm at school,” Jeff says, “I just want to be like my classmates. That's really important to me.” But Jeff doesn't have a normal schoolboy's life. He often has to travel for international races and has little free time. “I go to the pool every day and swim there for at least six hours. When I'm in the pool, I love every minute.”

    Recently, Chongqing Three Gorges University has held an activity named “Cell Phone Ninja” (手机忍者). They would like their students not to use cell phones for 21 days. It is really a challenge (挑战) for most students.

    The activity started on April 12. Each student who volunteered to take part in this activity got a bracelet (手环). If the students did not use their cell phones, there would be a photo on the screen of the bracelet to show that. If they used their cell phones, a different photo would appear on the screen of the bracelet. After the last class of each day, the students sent the photos to the school's public WeChat.

    More than 800 students wished to take part in this test, and 400 were chosen. After seven days, only 103 students remained. The test was set for 21 days because some scientists believe that 21 days is long enough to help form (形成) a habit.

    According to the teachers in the university, the activity was not a competition. It depended on students themselves to make the decision. The teachers hoped their students could form better study habits through activities like this one.

    Do you keep a diary（日记） every day? Do you think it is great to remember just what you did on a day many years ago? One way to remember each day is to write about it in a diary. Many people write their diaries every day. They write about what they did, what they ate, whom they saw and met, how they did something and how they felt during that day.

    Most people do not want anyone else to read their diaries. They keep them in a safe （安全的）place. Some Chinese students try to keep diaries in English not only to help themselves to remember something, but also to practice English.

    Long ago, many people wrote diaries, too. People have found some of those old diaries.  Some diaries are useful because we can learn about the life long ago, or we can get to know something important or something interesting.

    There are many famous diaries in the world. Most people in China have read the Diaries of Lei Feng. Lei Feng was a soldier（战士）.In his short life, he did a lot of good things for others and for his country. He was always ready to give, but never asked for anything from people. He kept diaries and from them, people learn what a great man he was. In China's schools,  students learn some of his diaries as texts（课文）.

根据短文内容回答问题：

    Internet has become one of the most important parts in our life. The Internet is a large, worldwide collection of computer networks. A network is a small group of computers put together.

    Internet is many different networks from all over the world. These networks are called the Internet. Once you have learned to use the Internet, you can have a lot of interests in the World Wide Web. The same time you will find it is helpful and your life is more interesting than before.

    On May 5^th, 2017, at Shanghai Pudong International Airport, China's first Homemade jet airliner(喷气式客机), the C919, took off successfully for the first time. It has taken about ten years for the scientists and researchers to make this Chinese dream come true. It's a pride of the whole nation. So far, more than 23 countries have already ordered 570 C919 planes from China. But we still have a long way to go before the C919 carries passengers by 2020.

    What's more, China is working on the new high-speed trains with the highest speed of 400km/h. It will be ready by 2020. Many countries, especially the ones in Central Asia, Southeast Asia, the Middle East and Eastern Europe, are planning to build high-speed rail lines or to improve their railways with the help of China.

    China has made great progress in both science and technology. And it makes a great contribution(贡献)to humans，too. All of these are changing the daily life of Chinese people，even of the people around the world.