单选题 3.  In pioneer days people often lived in ______ homes, long miles by horseback from the nearest police station, and they had to learn how to deal with many problems themselves.
【正确答案】 C
【答案解析】 A．偏僻的；B．单一的；C．隔离的；D．分开的。原句意思是：在开拓时代，人们经常住在偏远的家里，骑马去最近的警察局都很远，因此他们不得不学会自己处理很多问题。