(单选题)10: A hobby is something you do just for fun. It could be painting pictures, watching birds, or reading. Some people collect, or save things. These things could be new. But they might be old. Many beautiful thins were made long ago. Where do people get the things that they collect? At the beach many people pick up pretty shells to save. They find them near the sea. Some people pick up things from the street. They find things in the garbage. Others save things they get from their families or friends. Still others buy things to collect. Why do people collect things? First it can be fun. People really like the things they save. Also, you and a friend may collect the same thing. Then it＇s something you can do together. But some people like to do it alone. To them, a hobby is something you do by yourself. People also learn from their hobbies. You might have many pictures of kings. If you wanted to know more about them, you could go to the library and get a book. Then you could read about them. You would find out such things as when and where they lived. Saving things gives people something to do. Both children and older people like to have hobbies. Some people no longer work. So they collect things to keep busy. Hobbies fill many people＇s days with hours of fun. The most instructive meaning of collecting things is ___________.

A: To have fun

B: to follow the fashion

C: to learn something

D: to kill time