Wu Dajing won China's first gold medal at the 2018 Winter Olympics in PyeongChang. He broke world record in men's 500m short-track speed skating (短道速滑) on 22 February.

    World No. 1 Wu proved his ability in the event. He broke the world record twice. The young man won the gold medal with a time of 39.584 seconds. It raised our spirits. His performance was so perfect that even the other athletes showed respect for him.

    "I carried a lot of pressure into the final today after what we went through previously. I am just so proud of myself to bring out myself best in the race." said Wu. He won a silver medal at the 2014 Sochi Winter Olympics in Russia. "I really want to say 'Thank you' to my teacher. I just followed what she had told me before the final. I will still work hard and do better in the following races."

    Later, Wu and his teammates added another silver medal in the men's 5,000m team relay, bringing the Chinese delegation its ninth overall medal in the 2018 Winter Olympics in PyeongChang.

    Wu Dajing was born in Jiamusi in the north of China in 1994. He started short-track training at the age of 10. He used to train in Jiangsu and Jilin. He has become the most competitive athlete in the world and the hope for China.

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    Most people have jobs. They go to 1 nearly every day. Some people are lucky. Either they have very interesting jobs or they earn a lot of 2. Most people are not so lucky. Either their jobs are a bit 3 or they don't get well 4.

    The most interesting jobs are often the most 5. People spend long time learning how to do them. Doctors study for 6 six years after finishing school. Airline pilots(飞行员) study longer. They have to learn to fly small airy craft first, and then 7 move up to bigger and bigger aircraft. Most airline pilots are at least 30 years old.

    Some 8 people have interesting and well-paid jobs. Many successful athletes(运动员) are usually under 35. Older people usually can't 9 these sports very well because they can't move fast enough.

    Most people work until they are 60 or 65 year old. Some people 10 retire. These people usually have very interesting jobs. Writers, artists, musicians and actors usually work until they die.

亨利•福特曾说过：“如果我最初问消费者他们想要什么，他们会告诉我‘要一匹更快的马!’”。有人说，如果真这样，汽车大王就不会出现了。 材料体现的经济学道理是（    ）