已知： 分别代表不同种元素的原子，当两种物质在一定条件下能发生化学反应，用微观示意图表示为：
                                          
则下列说法正确的是（）

“牵着记忆的小手，和时光走走。”父母总希望在孩子成长过程中，留下照片、视频、文字等作纪念。如今，这一需求被一群年轻的创客瞄准，成功推出了一款名为“时间小屋”的APP。据此回答下列小题。

“时间小屋”以文字、图片、视频等形式记录孩子生活的点滴。体现了（）

阅读理解

　　William Jefferson Clinton(威廉·杰斐逊·克林顿)was born in a small town of America. He was born on 19th August, 1946. He was president of the USA from 1993 to 2001.

　　Wang Fei is a teacher. He was born in Shanghai and he teaches in a middle school. He is very friendly to his students. He lives in a big room with a TV, a kitchen, a bedroom and a bathroom. He is very young but very nice.