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.

雅鲁藏布大峡谷地区植物分布状况是：山麓热带雨林，山腰常绿阔叶林，上层温带针叶林，顶部高山草甸，这种分布状况主要是由下列哪种非生物因素引起（     ）

①没有什么比这幅写意墨竹更能体现竹的______了，在这里，竹摒弃了一切外在的形式和颜色，给观赏者留下的唯有人间风骨。

②放，放弃、放怀、放达……“放”蕴涵着千般哲理，运用得好，就会使复杂的生活回归简单，纷乱的思绪回归______，浮躁的心态回归淡然。

③红的、黄的、粉的，各色玫瑰，相继绽放，惹得人眼里一亮，美丽的花朵______了生活，普通的日子平添了些色彩、滋味和乐趣。