下列四个函数中，在闭区间﹣1，1上单调递增的函数是（　　）

    My friend Tom lives on Sun Street. It is near his school. He usually goes to school on foot. But sometimes he goes to school by bike. His father is a doctor. He goes to work by car. His mother is a teacher. She teaches English. She goes to work by metro. Today is Sunday. Tom doesn't have any lessons. He wants to go to Nanjing by train.

①将一小块金属钠长期露置于空气中发生一系列变化，最终产物是____ ；②用脱脂棉包住约0.2g过氧化钠粉未，置于石棉网上，往脱脂棉上滴几滴水，可观察到脱脂棉燃烧起来．由实验现象所得出的有关过氧化钠和水反应的结论是：

a：有氧气生成；b____ ．

Na₂O₂和水反应的化学方程式是　____ ．