From 1948 to 1966 average yearly growth in real spendable earnin

From 1948 to 1966 average yearly growth in real spendable earnings was ______ percent in the United States.
A、1.1
B、2.1
C、3.1
D、4.1
【正确答案】：B
【题目解析】：从1948年到1966年，美国实际可支出收入的平均年增长率为2.1%。