参考答案：D

解析：

[分析]： 是非判断。 题干：在大规模的转移之后，城市发生了什么变化根据原文“…many cities began to fall into disrepair．Crime began to soar，…housing construction costs continued to rise higher and higher…Gradually some of the larger companies began moving out of cities，with the result that urban centers declined even further．”，译文为：许多城市不再修缮，犯罪率直线上升，建造房屋的成本持续攀升，……逐渐地一些大公司也搬出了城市，结果是城市中心越发衰退。a项“房屋成本减少了。”为错误选项，b选项“犯罪率与以往相比低了。”为错误选项 C选项“所有的商业生意都搬出去了。”为错误选项。所以选d“城市衰败了。”