The __________ of his books among parents and the recommendation of experts both at home and abroad have quickly made him a celebrity educator.

A．similarity

B．popularity

C．personality

D．possibility

胎心减速开始在宫缩高峰后，下降慢持续时间长，恢复慢。提示

A．胎儿缺氧

B．胎儿状况良好

C．脐带受压，兴奋迷走神经

D．胎头受压，脑血流量一时性减少

E．胎儿受镇静药物影响