In the early songs of the Beatles, one hears plaintive Blues-inspired melodies that would seem to be more a product of rural southern America than an English industrial city.

上句比较对象错误，书上答案说有2种改法：

将 than an English industrial city改为：

1) than of an English industrial city.

或

2) than that of an English industrial city.

我的疑问是：

1）对于1），a product 真的可以省略吗？ than of an English industrial city 正确吗？

2）为什么不是  than one of an English industrial city, 为什么答案是 than that of an English industrial city ?

     前面出现的是a product, 所以我想后面需要用one替换，而不是that. 所以不懂答案2）。

3）句中出现的would属于什么用法？是虚拟语气吗？

谢谢老师详解！