Lian Zhan with his visitors _____ from Taiwan _____ paying his first visit to the mainland of China. [ ]

A. who come, is

B. whom is, is

C. which come, is

D. that are, are

不属于小儿贫血的病因的是（）

A.钩虫病

B.外伤大出血

C.铁、维生素B₁₂、叶酸、蛋白质等营养物质的缺乏或过量

D.脾功能亢进

E.G-6-PD缺乏