—_____ you write so well?                                   

—By reading and keeping diaries every day.[ ]

A. How is it that

B. Is it how that

C. How it is that

D. What is it that

下列哪些名称与所给出的维生素名称相符（）

A.抗坏血酸-维生素C

B.硫胺素-维生素B₁

C.钴胺素-维生素B₁₂

D.生育酚-维生素E

E.吡哆醛-维生素B₂