题目

________ I look back to those days as a child, I really hope to spare more time to accompany my father. A . However B . Whenever C . Whatever D . Wherever 答案：B春节时，孩子们总喜欢燃放鞭炮．有一种鞭炮，不需用火去点燃，只要稍用力将它甩向地面，鞭炮就可以爆响．这是鞭炮与地面发生碰撞时，通过________的方式，使它的内能________（选填“增大”、“减小”）．