求问36套ex6第十题。

为爱流泪UID: 2929679

谁能帮忙解释一下。完全不知道怎么选。。谢谢。

alteraUID: 2724954

Huge tracts of land were being
settled and farmed in Argentina, Australia, Canada, and in  
15  the American West, and these areas were joined with one
another（定位到这一句，然后题目中有after这个词。个么就看下一句） and with the countries of Europe into an
interdependent market system 。Consequently, agrarian
depressions no longer were local or national in scope, and
they struck several nations whose internal frontiers had  
not vanished or were not about to vanish
发现
B选项manifested themselves in several nations,   
    including those in which new land   
   remained available for farming
基本上就是原文改写，于是必定是他

为爱流泪UID: 2929679

2# altera


万分感谢！！