叶酸和维生素B12缺乏,主要是孕妇对叶酸的需要量增加、吸收减少和排泄增加|铁缺乏,主要是孕妇对铁的需要量增加、摄取不足或吸收不良|骨髓造血组织明显减少,导致造血功能衰竭,引起外周血象全血细胞减少所发生的贫血 A. 孕妇患巨幼红细胞性贫血的原因 B. 孕妇患缺铁性贫血的原因 C. 孕妇患再生障碍性贫血的原因 D. 孕妇患贫血的原因 E. 孕妇患血液病的原因
【单选题】Decide where the paragraph should be divided into two paragraphs.Because the Internet makes the world a smaller place, the value of having a common language is greatly increased. The question is, whic...