【单选题】【消耗次数：1】
前置胎盘的原因是（）
①
胚胎植入近子宫颈内口处
②
胚胎植入近输卵管开口处
③
胚胎植入子宫内膜过深
④
胎盘发育过大
⑤
胎盘发育过小
参考答案：
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相关题目
【单选题】
采用人工方法从女性体内取出卵子，使精子和卵子在试管内结合，形成胚胎，然后再植入子宫，继续妊娠的生育技术，称之为（ ）
①
体外受精
②
体内受精
③
受精
④
自体繁殖
⑤
代孕
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【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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