单选题
Discerned from the perplexing picture of population growth the 1980 census provided, America in 1970s ______.
A、
enjoyed the lowest net growth of population in history
B、
witnessed a southwestern shift of population
C、
underwent an unparalleled period of population growth
D、
brought to a standstill its pattern of migration since World War Ⅱ
【正确答案】
B
【答案解析】
[详细解答] 短文第四段告诉我们：美国人口一直大批向南部和西部迁移，至今这一趋势仍然没有减弱，这与选项[B]“美国人口在70年代经历了向西南地区的迁移”相一致．故为正确答案。
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