The school rules state that no child _____ out of the school, unless accompanied by an adult.

A．shall allow

B．shall be allowed

C．will allow

D．will be allowed

初产妇，26岁。38周妊娠，单臀，规律腹痛8小时入院，未破膜，查骨盆正常，宫口开大4cm，胎心140次/分，估计胎儿体重 3000g。

此时最恰当的处理方法是

A．脐带脱垂可能性大，立即剖宫产

B．密切观察下， * * 分娩

C．外倒转

D．人工破膜，促进产程进展

E．静滴缩宫素，预防产程进展缓慢