题目内容
收藏
纠错
题目材料：
The " combined age " of a group of people is the sum of the ages of all of the people in the group.Which of the following groups had the greatest combined age in 1986?
-
A20-year-old males
-
B20-year-old females
-
C60-year-old males
-
D60-year-old females
-
E80-year-old females
D显示答案
