题目解析:
disperse: 散开; 驱散, 对应 spread out 传播, 散布。The rural population both dispersed and grew, and was probably less homogeneous and more mobile than it had been a generation earlier.这里可以利用 and 的这个并列关系进行推测,disperse 和 grewin 并列,所有在这些选项中,明显只有 A 最为合适,即”农村人口既扩散了,也增长了”。而 B 选项的 gained power(获得权利),C 选项的 adapted(适应)和 D 选项的 specialized(专门从事)代入后都不合适。