阅读下列短文，从下面每题的A、B、C、D四个选项中选出最佳答案。
Model United Nations (MUN模拟联合国) offers a fantastic program to the youth worldwide. In Model UN, student delegates (代表) step into the shoes of ambassadors (大使) from UN members to debate the latest problems. Any student can take part in Model UN, as long as they have the dream to learn something new and to work with people to try and make a difference in the world.
In March, the 2017 MUN Youth Summit（峰会）was held in the Golden Hall of the United Nations Headquarters (总部), New York. Over 2000 student delegates from 67 countries came together to listen, present, debate, and offer solutions to some of our planet's most serious problems.
Zhou Kexin, from Futian Foreign Language School, as one of the 13 delegates from Shenzhen, attended this international conference (会议). During the four days' meeting, she played the role of a Bolivian (玻利维亚) delegate. She made speeches and debated how to improve and protect women's and children's rights. She exchanged ideas with student delegates from other countries. They worked hard to find solutions to the world's development and human rights problems.
Zhou Kexin survived three rounds of Model UN competitions including an English language test, a prepared speech, and a group discussion before she reached the final. It was her excellent English, critical (批判的) thinking and communicative skills that made her stand out from the other 1,600 Shenzhen contestants. In the final held on January 15th, Kexin managed to become one of the top prize winners. This meant she got a free ticket to a ten-day trip to the UN Headquarters in New York and finally became a teenage diplomat.
