阅读理解。 We wanted to study how students at our school spend money. In order to study this, we made some questions to ask our classmates. First, we asked our classmates how much money they spent in one month. Then we asked how much money they spent for things like drinks, music, books, movies, computer games, and other things. Our math teacher helped us make a graph of our classmates' answers. Then we thought it would be interesting to compare these answers with our classmates' expenses from last year. We used their answers to make another graph for their expenses last year. Looking at the two graphs, it is easy to compare the expenses for the two years. Some of their expenses increased, but others decreased . This was a very interesting project for us. 注：(1) graph 图表 (2) expense 消耗, 消费 1. What did the students spend most of their money on? A. Books. B. Movies. C. Drinks and snacks. D. Computer games. 2. Which expense of the students' stayed the same? A. CDs. B. Phone costs. C. Others. D. Transportation. 3. What does the word 'decrease' mean? A. 减少 B. 变化 C. 增加 D. 删除