题目

Hungry For a Win A victor is, by definition, someone who wins a struggle or contest. However, that doesn’t mean he or she will live a proud and happy life ever after, as Katniss Everdeen is about to discover in The Hunger Games: Catching Fire. Catching Fire, out in Chinese theaters on Nov 21, is set in a futuristic society called Panem. Every year its government holds a televised fight to the death. Two teenagers from each of the 12 districts of Panem are chosen to compete. In the new film, last year’s victors Katniss (Jennifer Lawrence) and her partner Peeta are back home after w用化学符号或者化学式填写：（1）2个氢原子 ； （2）五氧化二氮分子 ；（3）硫酸根离子 ；（4）标出硫化钠中硫元素的化合价 ．（5）请完成下列反应的化学方程式：2Al+2NaOH+2H2O═2NaAlO2+ ．