Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．

A．that

B．why

C．how

D．whether

女，25岁，妊娠24周时B超报告：胎盘位于子宫前壁下段，部分覆盖宫颈内口，产科检查正常。

下列哪项不是前置胎盘的并发症（）

A.产后出血

B.产褥感染

C.子宫破裂

D.胎儿宫内窘迫

E.新生儿窒息