Write a multi-choice question for the following article, with the given choices and answer: Article: News 1 Liu Xiang won China's first gold medal in the world championships in 12.95 seconds. "Everybody wants to win a world title. I was nervous before the race. But I dealt with it so I'm very happy," Liu said with a smile after the race. Some reporters noticed that at the start, Liu Xiang was crying. He said that is his way of letting off pressure. "My start wasn't good, maybe because I was nervous or because I was a bit slow," he said. Liu will run next at the Shanghai Grand Prix meeting at the end of September. He is confident after winning the gold medal. "I want people to know how fast I am," he said. "This is number one speed. There's nothing I can't do." News 2 Have you ever got angry at books that are full of mistakes? Don't worry, things will get better soon. Last week, China started checking textbooks, dictionaries and children's books all over the country. The government said the results of the check would come out at the end of June. News 3 Last Wednesday Medvedev took over from Vladimir Putin . At the age of 42, he becomes the youngest president of modern Russia. Medvedev was born to a family of teachers. He read a lot from a young age. After university, the soft-spoken young man went on to teach law at university and became very popular with his students. In 2005, Medvedev became the first deputy prime minister . But he was as friendly as before. "He has not changed. He invited me to his home," said Vera Smirnova, Medvedev's first teacher. "In Russia, only two politicians have invited their first teachers to their homes, Medvedev and Putin." Options: A He wanted to reduce pressure. B He was happy. C He was a bit slow. D He felt excited. Answer: A He wanted to reduce pressure. Question:
A:
Why was Liu Xiang crying at the start?