He’s very good at English. He spends most of his free time______ new words.

A．remember

B．remembering

C．remembers

D．remembered

某6个月女婴，母乳喂养未添加辅食，面色苍黄、嗜睡，诊断为巨幼细胞贫血，其主要原因是缺乏

A．蛋白质
B．铁
C．维生素A
D．维生素B₂
E．维生素B₁₂