More than _____of the population in the United States lived in c

More than _____of the population in the United States lived in city areas in 1988.
A、60%
B、75%
C、90%
D、50%
【正确答案】：B
【题目解析】：本题考查美国人口。1988年超过75%的美国人都居住在市区。