单选题 If a country turned inward and insulated itself, the result would be a diminished standard of living.
A. worshiped B. split C. innovated D. isolated

【正确答案】 D
【答案解析】insulate:绝缘,孤立,隔离;worship:崇拜;split:分裂,分摊,劈开;innovate:革新,创新;isolate:隔离,孤立