题目

It is believed that travelling to Yaan in ________ October is ________ enjoyable experience. A . /; the B . the; an C . /; an D . the, the 答案：C写出以下反应的化学方程式：（1）Na2O2与CO2反应：_______________（2）加热使NaHCO3分解：____________（3）Al与NaOH溶液反应：______________（4）Fe(OH)2长时间露置于空气中：_____________