Young Europeans, brought up in a period of economic success, seem to be similiar to Americans more than they do their own parents. 在经济繁荣期成长起来的欧洲的年轻人更象美国人而不象他们的父辈.
do代替了"seem to be similiar to".
也可以说成:
Young Europeans, brought up in a period of economic success, seem to be more similiar to Americans than to their own parents.
或
Young Europeans, brought up in a period of economic success, seem to be more similiar to Americans than they are to their own parents.