阅读下列材料，回答问题。

材料一封建的中世纪的终结和现代资本主义纪元的开端，是以一位大人物为标志的……他是中世纪的最后一为诗人，同时又是新时代的最初一位诗人。——恩格斯

材料二黄金是财富，谁占有黄金，谁就能获得他在世上所需的一切。——哥伦布

某县今年要完成360家民房改造工程，第一阶段完成了全年的20%，第二阶段完成了全年的 $\frac{1}{4}$ ，                         ？

请你选择下面其中的一个问题填在横线上，并解答．

A、已完成的占全年任务的几分之几？

B、第二阶段比第一阶段多完成了多少家？

C、两阶段一共完成了多少家？

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