Many years ago, children wore clothes that were the same as the clothes worn by adults, except that they were smaller. People believed that children were just “small adults”, and expected them to dress and act like adults. But now people know much more about children. In both body and mind, children are different from adults because they are at a different stage of development. As far as the body is concerned, it is obvious. A baby of six months can sit up, but can not run, and so on. But the development of the mind is not so obvious. A small child, for example, does not understand the difference between the present and the fu ture. So if the child asks for an apple and the parent says,“ No, not now, you can have one after lunch.' The child often cries. Some mothers think the child is being difficult, but perhaps he is just being differ ent he does not understand the idea of the future, and for him ”not now means “never”. So naturally, the child cries. People used to believe that ______.