In the old days,American families were bigger.People had more children,and grandparents and great-grandparents lived with their families.But now, families are smaller, and many old peoplelive alone.At the same time, Americans are living longer and longer.The number of old people is always growing.

　　以前美国都是大家庭。人们孩子很多，祖父母和曾祖父母都和家人在一起生活。但现在，家庭越来越小，许多老人独自生活。与此同时，美国人越活越长。老年人的数目总在不断增长。