His backpack          the chair. [ ]

A. can't in      

B. isn't on      

C. is for        

D. aren't on

与子痫前期发生有关的项目为（）

A.前置胎盘

B.胎盘早剥

C.羊水过多

D.双胎妊娠

E.胎儿窘迫