The population between the age of 25 and 44 increased by 28.1% from 1980 to 1989 in USA because______. ( )

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问题 The population between the age of 25 and 44 increased by 28.1% from 1980 to 1989 in USA because______. (  )

选项 A、this was the period of large inflow of young immigrants
B、this was the birth age of the baby boomers
C、the large number born during WW II reached this age bracket
D、those who were born in the period of baby boom reached this age bracket

答案D

解析 20世纪80年代人口年龄结构的变化反映r在这之前生育的趋势;1946年至1964年是生育高峰,出生率比较高,因此,24岁到44岁之间的人口增长了28.1%。
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