This question already has answers here: Closed 12 years ago. Possible Duplicate: Interfaces: Why cant I seem to grasp them?
我今年37岁，头胎，15周+5天，马上要做唐筛了，因为我年龄偏大，当地开发者_开发问答的医生建议我做无创DNA，现在已经预约了，听说无创dna单子是可以看出宝宝的性别的，所以我比较好奇，我是想要生一个女儿，有没有
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