关于恶性贫血，叙述错误的是（）

A.多数患者50~70岁发病

B.有贫血、胃肠道症状、神经系统症状和体征

C.常系淋巴细胞介导的自身免疫反应使胃壁细胞破坏，内因子分泌障碍所致

D.因手术切除胃组织引起的内因子缺少不属于恶性贫血

E.治疗上需要终身补充维生素B₁₂，宜口服给药

The soldiers planned to _____ the bridge but had to give up because a storm ____.

A．blow up, blew away

B．blow down, blew up

C．blow up, blew up

D．blow down, blew away