题目解析:
你可以推断,轻松解决水上任务的孩子已经经历了五七转变。 解决任务表明他们了解保存,这意味着他们已经达到了五七转变的发展水平。线索:Such experiments show a difference between children of five years and children of eight years. The older children can solve the task promptly...; The younger children...cannot do what the five-seven shift will do for them naturally....