若该孕妇筛査唐氏综合征患儿发病概率为 1/3 000,应进一步做的检査是（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25967' and id < 2178088 and id<>'2178088' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25967' and id > 2178088 and id<>'2178088' order by id asc limit 5