下列有关胎盘屏障的叙述，错误的是（）。

A.是胎盘绒毛与子宫血窦问的屏障

B.通透性与一般毛细血管相同

C.几乎所有药物均可通过

D.可阻止药物从母体进入胎儿的血液循环中

E.妊娠妇女原则上应禁用一切影响胎儿发育的药物

It was until last year that he ______.

A．left his home town for a new start 　

B．came to realize the importance of leaving English

C．worked as an English teacher at a middle school 　

D．set out to build a new house of h his own