According to the survey, which age group is the least happy?
A.People in their 50s.
B.People in their 40s.
C.People in their 20s.
D.Teenagers.
正确答案是A
According to the survey, which age group is the least happy?
A.People in their 50s.
B.People in their 40s.
C.People in their 20s.
D.Teenagers.
正确答案是A