Look at this desk. It's Jim's desk. It's brown. Jim's book is on it. The book is his English book. His pencil-box is on it, too. His pencil is in his pencil-box. But where's his pen? He can't find(找到) it.
一共有多少个小朋友在表演?
不同的场所、领域都有着不同的规则约束和规范着人们的行为,这说明( )