Rearrange the numbered sentences so that they move in the correct order. 把下列句子重新排序成一个完整连贯的段落。 A recent census reported that the American population is rapidly getting older. The aging of the nation will bring about serious effects. The most obvious effect is perhaps an economic one: how will the country bear the cost of caring for too many old people? (1) They now live mainly at home and need more services, and medical costs at present are almost twice the bill for people under 65. (2) Then,