氢气是一种可持续研发的新能源和工业原料。
（1）利用太阳能将水转化为氢能是一种理想途径。某种光分解水的过程如图甲所示。
①该转化中循环利用的物质有Fe3O4和 （填化学式）；
②与电解水相比，该方法的优点是 。
（2）CH2﹣H2O催化重整是目前大规模制取H2的重要方法，生产过程中涉及的重要反应有
①向催化重整体系中投入一定量的CaO可提高H2的百分含量，原因是 ；
②如图乙所示，投入纳米CaO时，H2的百分含量最大的原因是 。
（3）氢气可用于钢铁冶炼、合成氨和合成甲醇等工业。写出赤铁矿（主要成分为Fe2O3）与氢气在高温下炼铁的化学方程式：。
Dogs are the best pets of humans. They come in all sizes. Some dogs are as small as a football, and others are as tall as a desk. Dogs’ fur (毛) is different, too. It can be long and soft, or smooth and hard. People don’t mind the kind of fur, because all dogs are good to hug.
请在字典中查一下这个词。
我喜欢甜食， 你知道的。
去年， 彼得在旅途中和许多人交了朋友。
我叫托尼· 史密斯， 史密斯是我的姓。
我们在课上回答问题时应该起立
Tea and coffee are two of the most popular drinks in the world. However, people usually like one more than the other. These drinks also have very different uses.
People in the office usually sit for most of the day when they work. But this is bad for a person’s health. When people sit for too long every day, they don’t move very much. So it is easy to start getting fat. Sitting too long is also bad for their work because it makes them want to sleep. When this happens, people may make more mistakes in their work or spend more time finishing their work. Companies need workers to be healthy, so how do they fix the problem?
