在调平的托盘天平两边各放盛有等质量、等质量分数稀硫酸的烧杯．向左烧杯中加入一定质量的金属X，同时向右烧杯中加入相同质量的金属Y，观察到天平指针先偏向左边．当两种金属完全溶解后，天平指针又偏向右边（注：反应中都生成+2价的硫酸盐）．则：

（1）X、Y两种金属的活动性由强到弱的顺序为____ ．

（2）X、Y两种金属的相对原子质量由大到小的顺序为____ ．

    A new study says that American children have exciting after-school life. Many junior and senior students have a lot of interesting things to do in their free time. About 57% students have activities every day. 82% students have activities at least four times a week. American students spend their free time doing sports or enjoying arts, music and dancing. They like to have fun outside school because they can make a lot of friends during their activities.

人生需要理想的呼唤。你慵懒时，它呼唤你勤奋；你昏睡时，它呼唤你清醒；____，____；____，____。