阅读下面的材料，根据要求作文。

    有个四五岁男孩，平时总爱反着穿袜子，父亲有时帮他把袜子好好地穿上，他还要自己脱下来，再翻个面穿上去。有一次父亲生气地问他：“你为什么总要反着穿呢？线头露在外面，多难看！”没想到他竟理直气壮地说：“袜子是我在穿，不是穿给别人看的，线头在里面，会使我的脚不舒服，我当然要把袜子翻过来！”

    上面的材料引发了你怎样的思考？请结合自己的体验与感悟，写一篇文章。

    要求：①自选角度，自拟题目，自定文体。②不少于800字。③不得套作，不得抄袭。

生活中的下列现象，用分子的相关知识解释不正确的是（）          

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.