完型填空。

    Beijing is a great city. It is the capital1China. It's in the north of China. We can go to Beijing to 2the Great Wall, the Summer Palace and Tian'anmen Square. The zoo in Beijing is very famous. We can see many different kinds of3at the zoo. Most foreign tourists like visiting Beijing. They like the Great Wall, the Summer Palace and Tian'anmen Square. They also like 4food. London and Tokyo are great cities, too. We can see many tall buildings in London. We can see many5in Tokyo.

下图是北京白石台基上的紫禁城宫殿，它最突出的特征是

在常温下，Fe与水并不起反应，但在高温下，Fe与水蒸气可发生反应． 应用下列装置，在硬质玻璃管中放入还原铁粉和石棉绒的混合物，加热，并通入水蒸气，就可以完成高温下“Fe与水蒸气的反应实验”．请回答该实验中的问题．

写出该反应的反应方程式____；并指明该氧化还原反应的还原产物是____，氧化产物是____．

默写填空。