To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
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ChaseDream
这题答案应该在A, D之间,争议颇多,建议mm参考一下LES的置顶帖,莫要浪费前辈们的努力和精彩讨论.
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=56794&page=1
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