人胚胎发育初期和胚胎发育期的营养来源分别是( ) A.卵黄和脐带 B.卵黄和胎盘 发布时间:2017-06-21 15:08 │ 来源:www.tikuol.com 题型:选择题 问题: 人胚胎发育初期和胚胎发育期的营养来源分别是( )A.卵黄和脐带B.卵黄和胎盘C.卵黄和食物D.胚胎和脐带
题型:选择题 The quiet girl has ________ since she became a sales clerk.A.come to lightB.come to herselfC.come to an endD.come to life 查看答案