Yang Lei had ______ unusual experience in Gansu Province. ______ experience

changed her life.

A．a, The

B．an, The

C．an, A

D．an, An

以下与高血压的病因无关的是（）

A.体重超重

B.钠盐摄入过多

C.钙摄入过多

D.中度以上饮酒

E.遗传缺陷