听力原文:In this country, the total number of people over 65 years old is 23 million today
(30)
A.Aging population is expected to double within decades.
B.By 2020, 45% of the people in the country will be over sixty-five.
C.Old people in this country can expect to live a longer life.
D.In less than 20 years, 23 million more people will have to retire.