Only ______ a human being.

A．when is it hungry a lion will attack

B．when it is hungry a lion will attack

C．when it is hungry will a lion attack

D．when is it hungry will a lion attack

珠蛋白生成障碍性贫血的主要诊断依据是()

A．网织红细胞增高

B．血红蛋白电泳异常

C．血红蛋白尿

D．外周血出现有核红细胞

E．骨髓中幼稚红细胞明显增高