Girls' getting the ears pierced and boys' having long hair should not _____ in our school.[ ]

A. be allowed to

B. allow to

C. be allowed

D. allow

我国高血压急症病人最常见的致死原因（）

A.心力衰竭

B.脑卒中

C.肾功能衰竭

D.心肌梗死

E.主动脉内膜剥离