郑州吹响发展的“号角”。2016年底，郑州成功入围国家中心城市，2017年2月，中国（河南）自由贸易试验区正是挂牌。近年来中原发展有目共睹，随着中原经济区战略、航空港区获批、米字高铁规划、自贸区获批等一系列利好政策的出台实施，郑州城市建设越来越快，城市框架也随之不断拉大。10年间，郑州“长大”70%．郑东新区从荒芜之地崛起成“金融城”“商务城”“会展城”；郑州的头衔越来越多，国际航空大都市、国际物流中心、中原经济区核心增长区、中部重要的中心城市……未来，一座国家范儿的商都必将在中部地区崛起腾飞。

结合上述材料，运用所学知识，思考下列问题：

小明在班上做了一次民族成分的调查，他发现班上有五名同学来自不同的少数民族，这个调查印证了我国民族分布的特点是（  ）

阅读下列短文，从下面每小题的A、B、C、D四个选项中选出最佳选项。

    A group of eight students from Shenzhen Middle School won the gold medal at the 2017 United States International Youth Physics Competition on January 31. It was the second time for the school to win the prize after its first championship in 2013.

    All of the open-ended projects studied at the competition are beyond the normal standard at high schools. Shenzhen Middle School is the only high school in China that has won the gold medal.

    The competition this year attracted 11 top high schools in the United States and China, including Harker School and Philips Exeter University in the United States as well as the Middle School Affiliated with Renmin University of China（人大附中）and Nanjing Foreign Languages School in China.

    The Shenzhen Middle School team went through a two-day debate with the other teams in English about four physics projects that they had studied for a whole year.

The school said that the team prepared for a whole year, from raising theoretical（理论） models to designing experiments, which greatly developed the students' abilities to work and think like real scientists.

下列各句中，没有语病的一项是（    ）