A-A+
What major development in the 19th century led
问题详情
What major development in the 19th century led to a great economic boom for the cowboy?
A.The cow town settlements.
B.The construction of the railroads.
C.The pioneer settlements.
D.The use of modern technology.
参考答案
正确答案:B
解析:定位句中A great boon to the life of the cowboy与题干中的a great economic boom for the cowboy相对应,联系原文接下来部分可以推测B The construction of the railroads与原文相符,故为答案。