曾在长安、洛阳宫殿八次亲自面试科举应试者的皇帝是[ ]
A.唐太宗
B.唐玄宗
C.武则天
D.隋文帝
答案:B
—Can I come this afternoon or tomorrow morning?
— is OK. I'm free today and tomorrow.
A.Either
B.Neither
C.Both
D.None
简述病因研究的基本程序。