完型填空

    Good evening, everyone! Today, I'm very glad1a speech. 2name is "My Dream". We know everyone has his or her own dream. Some people want to be basketball players because they are good 3sports. Some would like to become 4because they like to stay with children. Do you know5 I'm going to be when I grow up? I like cooking, 6. I want to become a good cook. I think I must have great7 cooking food. I'd like to ask everyone to taste my food. I also like seeing their smiling faces after8the delicious food. However, it's not so9 to be a good luck. I decided to learn10 things about cooking from now on. I will work hard for my dream. I'm sure I will succeed (成功) some day.

下列物质中，属于纯净物的是（　　）

都江堰是我国一项伟大的水利工程。阅读材料，回答问题。