通过学过我们知道，构成物质的微粒子有分子、原子和离子。请你写出一种由原子构成的物质____，用化学方程式表示出该物质的一个化学性质____，写出该物质的一条用途____ 。

    It is necessary to relax ourselves after the exam. There are some kinds of  activities for us to take part in. First of all, we can go for a w____ along the bank of the river. We can also go to the movies or listen to music. What's more, joining in a sports club is a good c____, which can keep us healthy. For example, p____ football in the afternoon may relax ourselves. Above all, we should arrange(管理) our time p____ and live a regular(规律的) life. I hope all of us can have a wonderful time.

下列交通运输方式中，受天气影响最大的是（    ）

倘若请你把题目中的“最后”换成文中另外的词语，你会换成什么？