In the U. S. the high birth rate during the " baby boom" mainly refers to the period . ( )

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问题 In the U. S. the high birth rate during the " baby boom" mainly refers to the period . (  )

选项 A、1920—1930
B、1946—1964
C、1972—1982
D、1980—1990

答案B

解析 In the U.s.the higher birth rate during the“baby boom”(1946—1964).美国的生育高峰期为1946年至1964年,出生率比较高。
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